#help-with-arduino | adafruit | Page 48

surreal pawn Dec 31, 2019, 6:11 AM

#

you have the same problem with putting function implementations in your .h file: at link time if you include that .h file from multiple .cpp files you'll get the functions inside implemented in more than one compilation unit

#

[but that process is pretty much required for c++ templates 😦 ]

proven mauve Dec 31, 2019, 6:46 AM

#

Thank you for the detailed response... I think this is going to take a lot of thought and reading for me to digest properly

pine bramble Dec 31, 2019, 6:47 AM

#

.oO( do few things, but do them well )

#

Only learn as much as you're willing to put into use ;)

proven mauve Dec 31, 2019, 6:50 AM

#

It's hard to figure that part out. Using pretty much .h files for everything really does make me feel like a dummy, and this sequencer program isn't going to be small...

pine bramble Dec 31, 2019, 6:50 AM

#

You can be aware of a lot more without knowing it in full

proven mauve Dec 31, 2019, 6:51 AM

#

it's just hard to break out of, because using .h makes it easy haha

pine bramble Dec 31, 2019, 6:53 AM

#

The problem with C is that by the time you learn enough of it to get by, you're no longer offended by it

rocky igloo Dec 31, 2019, 6:56 AM

#

🤣 🤣

proven mauve Dec 31, 2019, 6:57 AM

#

lol

#

I broke my code apart again and really thought I might have it, but this whole .h and .cpp as opposed to just .h is kicking the tar out of me

rocky igloo Dec 31, 2019, 6:58 AM

#

@pine bramble I happen to have an e-book copy of K&R open on my screen this very moment. They comment on several shortcomings of the language but neglect to mention that one.

pine bramble Dec 31, 2019, 6:59 AM

#

;)

#

They're not magic suffixes. .h means nothing whatsoever.

#

I've seen people put code in their header files.

rocky igloo Dec 31, 2019, 7:02 AM

#

I've taken to calling that "The H Programming Language," where the programmer can't figure out how to separate the details of the implementation from what needs to be shared with its users, so they punt and put it all in the header file.

pine bramble Dec 31, 2019, 7:02 AM

#

Oh haha that's great.

#

I wonder if people are being introduced to the C Preprocessor or not.

#

Maybe they just don't know what it is or how it works. ;)

rocky igloo Dec 31, 2019, 7:03 AM

#

That's a real possibility.

#

I wonder if this leads to an argument about how much people should have to know about what each program does, versus knowing the language as an abstraction.

pine bramble Dec 31, 2019, 7:06 AM

#

I'm a big fan of turning on all the compiler warnings, and heeding every last one of them, playing whack a mole until none are left standing.

proven mauve Dec 31, 2019, 7:07 AM

#

So, it's definitely treating .cpp and .h differently. I can take the exact same .ino and .h, change the .h to .cpp and change the #include to .cpp and it no longer compiles due to variable not in scope issues, like it's trying to add the cpp before it does ANYTHING else, regardless of where the #include is. I change it back to .h and everything runs fine.

pine bramble Dec 31, 2019, 7:08 AM

#

If this is arduino, your .ino is supposed to be empty (comments are okay).

#

Then include <Arduino.h> at the top of every .cpp file.

#

That will give you some sense of what a .cpp is and is not.

#

Make sure you have three of them (or more) just to convince yourself of a few things hard to explain but (somewhat) easy to apprehend in a live programming session.

#

I can't remember the last time I worried about what order the .cpp files were compiled in. ;)

proven mauve Dec 31, 2019, 7:11 AM

#

oiy

pine bramble Dec 31, 2019, 7:11 AM

#

Start over with nothing, and build up.

#

Trying to save a bad coding session isn't worthwhile.

#

Treat the earlier work as a collection of notes and snippets.

#

(Unless you're porting; then you may really be stuck working with what you have, haha)

rocky igloo Dec 31, 2019, 7:13 AM

#

Lemme get Socratic here. @proven mauve, why would you need to #include a .cpp file? I'm having a hard time thinking of a good reason to do that.

pine bramble Dec 31, 2019, 7:13 AM

#

Top down. Bottom up. Middle out. ;)

proven mauve Dec 31, 2019, 7:14 AM

#

haha, this is the begging XD

pine bramble Dec 31, 2019, 7:15 AM

#

Yeah he's right, including a .cpp is a fundamental misconception (in action).

#

The compiler finds those for you. No need to tell it that they're there.

proven mauve Dec 31, 2019, 7:16 AM

#

timvector, because I'm not very smart on this yet. I was including it when it was .h, and where I included it mattered because I was manipulating global variables. But I'm filling those .h with code and I know it's not 'proper'. So when I changed to trying to use .cpp to be more in line with convention, there's a lot about the compilation as a whole I don't understand and I'm trying to treat it the same as I was.

pine bramble Dec 31, 2019, 7:17 AM

#

You're just tricking the C Preprocessor into treating your code as if it were a monolithic single file.

proven mauve Dec 31, 2019, 7:17 AM

#

right

rocky igloo Dec 31, 2019, 7:17 AM

#

My idea is that a .cpp file is like Vegas. What happens in there stays in there. 😁 Code in any other file doesn't have to know about it and shouldn't.

pine bramble Dec 31, 2019, 7:17 AM

#

Why are you offended by a single monolithic file, then?

rocky igloo Dec 31, 2019, 7:18 AM

#

But the point of a header file is that what you put in there gets shared with every file that #includes it.

#

I'm actually old enough to remember that it was a big deal in the 1970s for C to allow "separate compilation" because it let you write modular applications.

proven mauve Dec 31, 2019, 7:21 AM

#

So, my understanding is you have arduino code, and eventually you bring everything into your ino, because that's your setup {} and loop {}. So, with the header files it was great, because I could break the program up into functional chunks, and #include them in order because I'm sharing global variables between them (which kinda goes back to me being fairly green). Those global variables are my hangup... because if I want to change to cpp it looks like it grabs those files automatically without needing the include like you're saying, so it tries to get them ready before the global variables are declared and I get an error....

#

I probably need to be looking into objects and methods maybe, something along those lines, instead of using global variables the way I do

pine bramble Dec 31, 2019, 7:21 AM

#

@rocky igloo Well, right, and it's deeply appreciated in conjunction with the Makefile, in that you don't often need to rebuild most of your object files, to make small changes.

#

Just use extern in your .cpp to reference the variable you declared in another .cpp.
Since you have an empty .ino it starts to sink in that there's no 'the' .cpp there's just 'a' .cpp.

proven mauve Dec 31, 2019, 7:24 AM

#

so with extern, it tells it, "this isn't declared yet, but it will be before you need it", and then you have a single declaration that isn't extern?

pine bramble Dec 31, 2019, 7:25 AM

#

The main difference is when you add the extern to the definition, you can't initialize.

#

extern int jagged;
int jagged = 17;

rocky igloo Dec 31, 2019, 7:26 AM

#

I often misuse the terms myself but since I have the book open here, I'll quote: "There must be only one 'definition' of an external variable among all the files that make up the source program; other files may contain 'extern' declarations to access it."

proven mauve Dec 31, 2019, 7:26 AM

#

I see

pine bramble Dec 31, 2019, 7:26 AM

#

The first one goes in a secondary .cpp file.
The second one initializes jagged with 17.

#

What Tim just said was what I meant. ;)

proven mauve Dec 31, 2019, 7:27 AM

#

so, with an empty .ino you make setup {} and loop {} in the different .cpps and it runs them for each file?

rocky igloo Dec 31, 2019, 7:27 AM

#

Just one definition in one place in one file (your choice which one) but a declaration for every file that uses it.

proven mauve Dec 31, 2019, 7:27 AM

#

I see, I see

pine bramble Dec 31, 2019, 7:27 AM

#

Keep it simple: create a file called foobar_sketch.cpp and pretend that's your .ino file.

proven mauve Dec 31, 2019, 7:28 AM

#

kk

#

then add .cpps to separate the program, and if they need access to a global variable, extern it

#

in the files that need access to it

pine bramble Dec 31, 2019, 7:29 AM

#

Treat a second .cpp as 'spillover' for something obvious that you understand well, but don't wish to clutter the main sketch.cpp with the details of.

#

I generally look at something and say 'this got big' and immediately open a new .cpp to contain it.

proven mauve Dec 31, 2019, 7:30 AM

#

right

#

so, that's sortof what I was doing before, but using .h extensions so it worked different, everything needed #included but I could pick and choose exactly where the program started looking at it. This is the project I'm talking about: https://github.com/SandwichRising/Tamaguino-Mega

GitHub

SandwichRising/Tamaguino-Mega

Tamaguino Mega Version based off jakob's project @ - SandwichRising/Tamaguino-Mega

#

so, in the tamaguino-mega folder, like menu.h for example... all the menu code is there and called as a function in the loop{}.... but I could have just made up an extension and used it like .support or whatever instead of .h and it would have behaved exactly the same is what I'm starting to see

#

all except .cpp which the compiler gathers up automatically

pine bramble Dec 31, 2019, 7:33 AM

#

That's probably about right. I can't say because I stopped experimenting with that a while ago. ;)

proven mauve Dec 31, 2019, 7:33 AM

#

man, I hate being dumb on this stuff >.<

#

I gotta get back to work. Thank you guys for the input... gives me things to chew over

pine bramble Dec 31, 2019, 7:34 AM

#

:)

#

My boss used to say (a lot) 'stop doing that' about a blistering array of things. ;)

proven mauve Dec 31, 2019, 7:35 AM

#

hahaha

#

it's bad convention!!!

pine bramble Dec 31, 2019, 7:35 AM

#

My music mentor said never (ever) play anything but your best. No 'practice' because that just reinforces bad habits.

#

I find I spend most of my time implementing something I know perfectly well how to do, but the physical typing to get it into the real world (from where it sits in my mind) is the bottleneck.

rocky igloo Dec 31, 2019, 7:38 AM

#

I wonder if the Arduino environment and the other BlahBlahBlahStudio IDEs make it harder to understand separate compilation. The .o files are hidden in some temporary directory and aren't there to make it clear that code from each source modules lives in different place, and only knows what's in the other modules because of what it sees in your header files.

pine bramble Dec 31, 2019, 7:38 AM

#

To be fair, I spend a lot of time in another room or outdoors thinking about the problem, but not so much at the keyboard, unless I'm working out something new and need a model to follow, on-screen.

proven mauve Dec 31, 2019, 7:38 AM

#

Alright, thanks again guys. I'll see you around later!

rocky igloo Dec 31, 2019, 7:39 AM

#

Good luck with it!

pine bramble Dec 31, 2019, 7:39 AM

#

@rocky igloo Learning how to author a Makefile was very important in that process, for me.

rocky igloo Dec 31, 2019, 7:39 AM

#

I wrote C for a decade before I ever saw a Makefile. 😁

pine bramble Dec 31, 2019, 7:40 AM

#

Haha.

rocky igloo Dec 31, 2019, 7:40 AM

#

I've spent time lately running old versions of Unix in an emulator and studying the Bell Labs source code, and you can actually follow the evolution of make through the different versions.

pine bramble Dec 31, 2019, 7:41 AM

#

Well you know that http://9front.org never gave up on Plan9.

rocky igloo Dec 31, 2019, 7:42 AM

#

For a long time, each project had a script file called run or build or something, and gradually they combined the best ideas from each into a standard system.

pine bramble Dec 31, 2019, 7:43 AM

#

I used to author hard-coded .html files and assemble the headers and footers to the variable text using a Makefile. ;)

rocky igloo Dec 31, 2019, 7:45 AM

#

I've known about Plan 9 for a while without ever digging too deeply into it--borrowed some source from it a time or two--but only recently learned that it has its own obscure successor, Inferno. https://en.wikipedia.org/wiki/Inferno_(operating_system)

Inferno (operating system)

Inferno is a distributed operating system started at Bell Labs and now developed and maintained by Vita Nuova Holdings as free software. Inferno was based on the experience gained with Plan 9 from Bell Labs, and the further research of Bell Labs into operating systems, langua...

pine bramble Dec 31, 2019, 7:47 AM

#

I think it's http://cat-v.org/ .. not sure .. has some doco on this.

rocky igloo Dec 31, 2019, 7:51 AM

#

Yup, been spending a lot of time on that site!

#

But focusing on the 1970s work.

#

I'm very interested in Dennis Ritchie's original C compiler. To me, the code in it says a lot about how he saw the language and what motivated him to add to it in the order he did.

#

And the compiler implements lists, trees, hash tables, dictionaries, etc, all in straight C and usually without using the language features he had most recently added.

pine bramble Dec 31, 2019, 8:00 AM

#

I bet that is a rich and rewarding .. tour .. can't think of the word. Good on you for wanting to appreciate it in the order it was first made. That's some good (accurate) anticipation on your part. I do the same thing with git repositories, and try to commit in such a way that people can follow it from a germ (top down - bottom up - middle out).

#

afk

rocky igloo Dec 31, 2019, 8:04 AM

#

I guess in our own way we do something like deep reading from literary analysis. There's a big picture of where a project came from, who the author or authors are, and why and how it came to be like it is.

#

I suppose also a lot of meta context around software--tutorials, sample code, style guides, and monographs on good practices.

pine bramble Dec 31, 2019, 8:10 AM

#

The webmaster of cat-v.org is a rare archivist. ;)

#

I think the name is a play on http://catb.org/ which is ESR's site.

rocky igloo Dec 31, 2019, 8:15 AM

#

It's quite a collection. Also really good stuff at The Unix Heritage Society, tuhs.org.

#

I associated the site's name with this: http://harmful.cat-v.org/cat-v/

pine bramble Dec 31, 2019, 8:24 AM

#

https://amzn.to/2YgpRqc

#

Definitely harmful. But catb.org predates cat-v.org by quite a margin.

rocky igloo Dec 31, 2019, 8:27 AM

#

https://www.amazon.com/9FRONT-SKIN-EVIL-Stanley-Lieber/dp/1099171563

#

Reader reviews include: "I literally could not put this book down until I was done holding it." "If you are pure of heart, you can read this book and not explode." and "7/5, would purchase again."

#

OK include wasn't quite correct. Those are the only three reader reviews.

pine bramble Dec 31, 2019, 8:33 AM

#

Well it's also free on the main site. I never in fact shelled out the cash to Amazon for a hard copy. ;)

#

http://9front.org/propaganda/books

rocky igloo Dec 31, 2019, 8:34 AM

#

The descriptions of each of the hard-copy volumes even say, "It is very likely outdated."

#

Have you installed a 9front system?

pine bramble Dec 31, 2019, 8:39 AM

#

Yeah I ran 9front for a while.

#

Back then the limitation was which video cards were supported.

#

I had a problem develop months later and just didn't solve it. ;)

#

iirc I had a partition on my hard disk just for 9front.

#

I would dual-boot.

#

I also ran it in an emulator in Linux for a while, on the side.

#

These days I just download and build plan9port and keep it on tap inside Xorg inside Linux. ;)

#

But 9front is better.

#

I should probably take the time to reinstall it in an emulator, again.

#

Just it would eat time I don't want to give up.

#

(because it's interesting and worth learning)

rocky igloo Dec 31, 2019, 8:44 AM

#

So much to do...

#

It's becoming a running joke, "a fun little project I can knock out in an evening or two."

pine bramble Dec 31, 2019, 8:44 AM

#

I've been working on various Forths for a while and have stuck to that agenda.

#

I just found Dr. Ting's eForth implementation for the STM32F407 discovery board, a few weeks ago.

#

It's kind of the end-all for me .. I'm a little confused what to do next; so much is done already, in it. ;)

#

So I'm going to write a .hex outputter inside it, and dump it to a .hex file.

#

(which is how it got in there, too haha)

#

I want to see what I can do by the way of modifying it in-situ, then exporting to .hex from inside it (just like a regular hexdump - a session with a serial comm program like putty (minicom in my case).

#

I'm thinking I can switch it over to the correct port pins assigned to TX and RX (it's on SDA and SCL right now, as silcscreened on the STM32F405 Express. ;)

#

That way, anyone who tries it can still use SDA and SCL (as labeled) on the Express board.

#

(I don't think it really matters much)

#

There's usually a reason why things are done the way they got done, so I thought I'd go ahead and 'correct' this problem.

proven mauve Dec 31, 2019, 8:51 AM

#

@pine bramble @rocky igloo I'm getting it. I just emptied out my ino and got it to compile using .cpp's and .h's.... It's weird how it's like hitting a brick wall all up until you look at it once and things suddenly make sense and you can't figure out how you didn't see it before

pine bramble Dec 31, 2019, 8:51 AM

#

There you go. ;)

#

Nick Gammon wrote all this up, by the way.

#

(That's how I heard about it)

proven mauve Dec 31, 2019, 8:54 AM

#

I thought I could put my variables in the headers but was running into double declaration problems, even with #ifndef statements, so I'm going to have to get it a bit more, but it's a start lol

pine bramble Dec 31, 2019, 8:56 AM

#

https://www.gammon.com.au/forum/?id=12625

#

Working out the consequences of what he said is up to you; there's more than one way to do it. ;)

#

(My .ino is always blank even though I use libraries; I don't quite know why it works out fine but it does)

#

@rocky igloo @rocky igloo I'm really gone now. Thanks for the.

#

fades

low ingot Dec 31, 2019, 1:45 PM

#

am I going crazy? For some reason, I'm unable to use iostream with arm-none-eabi

proven mauve Dec 31, 2019, 5:49 PM

#

@pine bramble @rocky igloo @surreal pawn You guys are awesome yet again, you got some concepts to sink in and now I am not having problems dividing my program up into .cpp's, I understand some of the compiling concepts so much better now and am off and running.

@acoustic nebula You are also super awesome, your library is great. It was really easy to add in a single boolean variable to control turning on and off buffer dumping or using direct rendering instead. With the buffer dumping turned off, I have the samd doing 400,000 cycles a second with the screen refreshing at 20fps, and with buffer dumping it's about 225k CPS. All while running the I2C bus at 400kHz and transferring potentiometer and button data over it from an external 328P as well as the screen (the 328p is running with the 8mhz internal clock at 3.3v, so when I get around 800kHz on the bus I start getting hangs). In a nutshell, I'll really be able to build off of this, and am really looking forward to getting this MIDI sequencer going.

#

📎 IMG_20191231_221202236.jpg

rocky igloo Dec 31, 2019, 5:56 PM

#

@proven mauve Way to go! It's great that you're taking it seriously and paying attention to the quality of the code you write. Best of luck with the project. 😄

jolly goblet Dec 31, 2019, 9:54 PM

#

I am trying to build a prototype that uses a k-thermocouple to remotely measure the temperature of an air dryer via bluetooth,
My concern and why I'm reaching out to you as, the high heat point is 300 degrees fahrenheit, how do I avoid the electronics overheating from the k-thermocouple?
What electronics are suggested?

narrow thorn Dec 31, 2019, 9:56 PM

#

longer wires?

tough snow Dec 31, 2019, 10:39 PM

#

A thermocouple is designed in its purpose to not transmit heat to the electronics connected to it. So long as the electronics are not in the path of the heat inside the air dryer, they should be fine.

pine bramble Jan 1, 2020, 1:01 AM

#

#include <LiquidCrystal.h>
#include <FastLED.h>

#define LED_PIN     5
#define NUM_LEDS    144

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

CRGB leds[NUM_LEDS];

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");

  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);

}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis() / 1000);

  for (int i = 0; i <= 143; i++) {
    leds[i] = CRGB ( 0, 0, 255);
    FastLED.show();
    delay(40);
  }
  for (int i = 143; i >= 0; i--) {
    leds[i] = CRGB ( 255, 0, 0);
    FastLED.show();
    delay(40);
  }
}```

the print works fine without any of the LED code. when the LED code is added the print only gets updated every 20/30s . any ideas?

#

removing the delays it still only updates every 2-3s

tough snow Jan 1, 2020, 1:03 AM

#

@pine bramble So, here's what I see at first.

#

Your print will happen once per loop.

#

But, inside that loop, you have two separate for loops.

#

So, the first for loop needs to run... 143 times before the second for loop runs another 143 times.

#

And then the print will happen again.

#

Er, my bad. 144 times. Silly zeroes.

#

So, 288 loops with a delay of 40 is 11.5 seconds worth of just delays. That's not counting any amount of time that the FastLED library takes.

pine bramble Jan 1, 2020, 1:07 AM

#

ok that makes sense

tough snow Jan 1, 2020, 1:08 AM

#

How do you improve that? I'm not sure. I don't know precisely what you're going for, nor have I poked at coding at all recently. But that's what jumps out at me at first.

pine bramble Jan 1, 2020, 1:09 AM

#

i haven't messed with my arduino in a while and picked up a strip of neopixels and i already had a 16x2 LCD screen. was gonna try to wire up a button and come up with several patterns to cycle through and just noticed that 'bug' while wiring everything up.

#

hooked up my led's with external power supply and arduino on a seperate one and the things freak out. if i hook them directly up to arduino with a shared powersupply it works fine

tough snow Jan 1, 2020, 1:11 AM

#

The LEDs should be on an external power supply - Just make sure the grounds are connected together

pine bramble Jan 1, 2020, 1:12 AM

#

ah thats what the problem is. guess i should read about these, looks like i need a couple resistors and a cap

tough snow Jan 1, 2020, 1:12 AM

#

There's a nice NeoPixel guide on the Adafruit Learn Center

#

Never really fiddled with NeoPixels myself, though

pine bramble Jan 1, 2020, 1:14 AM

#

yes im reading now. says it wants a 300-500 ohm resister on the data line. i only have 4.7k and 10k ohm ones 🐼

steady badge Jan 1, 2020, 2:15 AM

#

sorry to bother you guys, but if anyone can please help me my arduino ide on linux changed ports randomly

#

i have been trying to figure it out on my own, but after 4 tutorials online i still havfent found what I need to fix the problem

#

I found that my arduino is on dev/ttyACM0

#

and I read online that I need to change the config file in arduino, but there are actually a few config files for (edit) the ide and I don't know which one to use

tough snow Jan 1, 2020, 2:29 AM

#

@steady badge In the IDE, you might be able to select "Port" under "Tools" but I'm not on linux so I don't know for certain.

#

I know that I have had boards that, under Windows, would end up being assigned a new number frequently, which was super annoying, but it was just a matter of selecting the port in the IDE, no file editing needed

steady badge Jan 1, 2020, 2:36 AM

#

there are 32 ports

#

and i went through 20 ports one by one

#

i guess i will go through the last 12 lol

#

@tough snow i'm getting an error avrdude: ser_open(): can't set buffers for

#

and then "\.\COMxx"

#

is that the error you get for having the wrong port

tough snow Jan 1, 2020, 2:38 AM

#

I haven't fiddled with that end of the ARduino IDE. For me, it only shows ports that have things on them.

steady badge Jan 1, 2020, 2:39 AM

#

i think that in linux it emulates a lot of extra ports

#

📎 unknown.png

steady badge Jan 1, 2020, 7:48 AM

#

I dual boot windows and I just used it there

bright nest Jan 1, 2020, 11:08 PM

#

Is there an Arduino board that has either 8+ analog pins or a separate pin for SCL and SDA?

tough snow Jan 1, 2020, 11:13 PM

#

@bright nest The Mega has a pile of pins. But what are you trying to do?

bright nest Jan 1, 2020, 11:13 PM

#

I want to use the 12 channel servo controller, but it requires an SCL and SDA pin. I need a board that has at least 7 analog pins because my project uses 7 force resistors, which each require an analog pin. The Arduino Nano fits the analog pin requirement, but it needs to use several of the analog pins in order to be compatible with the servo controller, which leaves me with an insufficient amount of analog pins. I've done some research and it looks like the Arduino Mega is a good fit, but it's also pretty expensive....

#

sorry it took me a while to type that out

tough snow Jan 1, 2020, 11:13 PM

#

No worries

#

So, I see what you're trying to do but, and this may sound silly, what are you trying to do?

#

Or, put better, why are you needing the force resistors?

bright nest Jan 1, 2020, 11:18 PM

#

Okay well this might take a while to explain LOL

tough snow Jan 1, 2020, 11:18 PM

#

Sure!

bright nest Jan 1, 2020, 11:25 PM

#

So I'm a senior in high school, and one of things that my school requires us to do is a senior community service project that involves the engineering concepts we've learned throughout high school, which means we have to actually build something. I foolishly decided on building a Harry Potter-themed bookcase that housed the Harry Potter series, complete with an animatronic Sorting Hat that reacted every time you interacted with a book. The hat requires servo motors in order to move, which explains the motor controller, and the force resistors are to signal whenever a book is taken out or put back.

Also, my teacher wanted us to include a working mechanical door on the bookshelf, just to add to the complexity, so I figured I could 3D print a wand that held an IR emitter and attach an IR reciever somewhere in the hat so that the door would open with the flick of a wand like in Universal Studios.

I dreamed a little too big, and the project is due next week. I have the skeleton of the hat printed and assembled, but I've realized that I needed a lot more than a couple of hobby servos to actually get it to work correctly.

tough snow Jan 1, 2020, 11:27 PM

#

Oh. Well. I have known that.

bright nest Jan 1, 2020, 11:27 PM

#

📎 image0.jpg

#

thats what i have so far lol

tough snow Jan 1, 2020, 11:27 PM

#

You only need to know if a book has been moved, right?

bright nest Jan 1, 2020, 11:28 PM

#

yeah pretty much

tough snow Jan 1, 2020, 11:29 PM

#

Because, realistically, you could use digital pins for figuring if a book has been moved. Not 100% sure if you can use your force resistors for that, if you already have them

#

If not, you can use one of a number of other methods of detection.

bright nest Jan 1, 2020, 11:29 PM

#

I wasn't sure if the force resistors would be compatible with digital pins...

tough snow Jan 1, 2020, 11:30 PM

#

They're strictly analog devices, right?

bright nest Jan 1, 2020, 11:30 PM

#

https://www.adafruit.com/product/166

Round Force-Sensitive Resistor (FSR)

FSRs are sensors that allow you to detect physical pressure, squeezing and weight. They are simple to use and low cost. This sensor is a Interlink model 402 FSR with 1/2 diameter sensing ...

tough snow Jan 1, 2020, 11:30 PM

#

Digital returns a 1 if the voltage is above a certain point, and 0 if it's below that point. The question is if the resistor would go low/high at the right points

#

Those are really cool

bright nest Jan 1, 2020, 11:31 PM

#

I don't know how I would test that

tough snow Jan 1, 2020, 11:31 PM

#

Honestly, I don't either

#

Have you already purchased the resistors?

bright nest Jan 1, 2020, 11:32 PM

#

Yup. Seven of them for about $50

tough snow Jan 1, 2020, 11:32 PM

#

OK. Then I will suggest to you an item that will solve your problems without having you re-purchase anything

#

And that is: The multiplexer!

#

https://www.sparkfun.com/products/13906

SparkFun Multiplexer Breakout - 8 Channel (74HC4051)

The SparkFun Multiplexer Breakout provides access to all pins and features of the 74HC4051, an 8-channel analog multiplexer/demultiplexer. The 74HC4051 all

#

This lets you use 8 analog devices on a single analog pin.

#

You control it with three signal pins to select which channel it is reading

bright nest Jan 1, 2020, 11:35 PM

#

whoaaa'

#

WAIT THATS ACTUALLY PERFECT

tough snow Jan 1, 2020, 11:37 PM

#

Makes programming a little bit more complex, but not a ton

#

And means you can use a lot more in the way of microcontrollers and not have to worry about the size or cost of a Mega

bright nest Jan 1, 2020, 11:39 PM

#

but what if i need to read the output of all of the resistors at relatively the same time?

#

oh i see

#

i would just have to loop through all of the pins and decrease the delay in between so it loops really quickly?

tough snow Jan 1, 2020, 11:41 PM

#

Programatically, you'd have to cycle through them anyway. This just adds a step for changing the MUX between, which isn't a lot of time

#

Yep

#

I've used one of them for an array of Hall Effect Sensors

#

There was actually a point where I was reading things too fast and the information was getting screwy

bright nest Jan 1, 2020, 11:47 PM

#

Interesting. Once I get it I'll start experimenting to see if I can get everything working the way I want it to. Thank you so much for your help!

#

If I ever need some programming assistance, is it okay if I ask you?

tough snow Jan 1, 2020, 11:48 PM

#

Programming, I'm terrible on

#

Well.

#

That's a lie.

#

I don't like programming so I do as minimum as necessary, so there's a lot of gaps in my knowledge

#

However, this is the place to ask for help. Plenty of people know programming and can help out

bright nest Jan 1, 2020, 11:50 PM

#

Awesome. Thank you again!

tough snow Jan 1, 2020, 11:50 PM

#

Not a problem! Happy to be of assistance

acoustic nebula Jan 2, 2020, 9:58 AM

#

@bright nest you should have enough analog pins to do it without the multiplexor

#

You can do I2C on any 2 GPIO Pins

#

the Nano sounds like it has enough I/O to do the job

marsh sleet Jan 2, 2020, 2:13 PM

#

Hello, while i was doing my IT homework, i came across a question that left me confused. We have to use a null terminated string, we have a couple of sentences (kinda like the lorem one but in french) and we have to count how many sentences there is in that text

#

At first i wanted to use the strchr operation

#

but i didn't understood how it worked

acoustic nebula Jan 2, 2020, 2:23 PM

#

you can use strlen() and keep advancing a pointer with the length of each string (+1)

marsh sleet Jan 2, 2020, 2:24 PM

#

but strlen only count the number of characters in a string right ?

acoustic nebula Jan 2, 2020, 2:24 PM

#

e.g.
char *pText;
while (pText[0] != 0)
{
printf("sentence = %s\n", pText);
pText += strlen(pText) + 1;
}
// assumes there's a double terminator on the last sentence

marsh sleet Jan 2, 2020, 2:26 PM

#

sorry, i just started to learn about the strings and null terminated strings, and i don't understand fully the usage of all the operations it seem

#

so strlen count the number of characters until it find a new sentence ?

acoustic nebula Jan 2, 2020, 2:27 PM

#

you're normally given a pointer to the start of a C-String. You know you've hit the end when you reach a 0x00 byte. strlen gives you the length of the string from the start until it hits the 0x00

#

e.g. 0x41 0x42 0x43 0x00 ("ABC")
strlen() would return 3

marsh sleet Jan 2, 2020, 2:28 PM

#

okay, i understand that (i also have to show the number of characters in the text and i used strlen), but i don't see how that would help me find the number of sentences

#

i first though that i would only need to count how many "." are in the text

#

which is why i tried to use strchr

#

but it seem that's it's harder than i though

acoustic nebula Jan 2, 2020, 2:29 PM

#

if each sentence is a zero-terminated string and they're stored one after the other, my code above will work; just add a counter in the middle (e.g. iSentenceCount++)

marsh sleet Jan 2, 2020, 2:29 PM

#

okay i'll try that thank

#

one question, i need to use ch[] = "text", but that will also work right ?

#

like char ch1[] ="text";

acoustic nebula Jan 2, 2020, 2:31 PM

#

yes, the compiler will turn this:
char text[] = "ABC";
into this:
0x41 0x42 0x43 0x00

marsh sleet Jan 2, 2020, 2:31 PM

#

okay thank you

acoustic nebula Jan 2, 2020, 2:32 PM

#

you may get warnings depending on how you define your constant char strings

marsh sleet Jan 2, 2020, 2:42 PM

#

it work perfectly thank, but i never understood the usage of the * before/after variable

#

like the char *pText;

north stream Jan 2, 2020, 2:45 PM

#

That means that the pText variable isn't a character, but a pointer to a character.

#

C uses pointers for arrays (and strings are arrays), so you'll see a lot of that kind of thing, as well as things like ```c
char message[] = "This is a string";
char * pMessage;

for (pMessage = message; *pMessage != '\0'; ++pMessage) {
}

#

It turns out that message and pMessage are both pointers to characters, so the pMessage = message assignment is both legal and reasonable.

marsh sleet Jan 2, 2020, 2:52 PM

#

oh okay thank you

proven mauve Jan 2, 2020, 3:35 PM

#

ugh, I forgot I have to brush up on pointers and you guys reminded me

#

@acoustic nebula got a working menu system written in now and I'm still getting an easy 600k cycles per second. It jumps to 1 million if I go to a page that only has a title

📎 JPEG_20200102_200724.jpg

acoustic nebula Jan 2, 2020, 4:13 PM

#

👍

vast cosmos Jan 2, 2020, 6:02 PM

#

1million cycles? over I2C?

#

oh that doesnt mean draw cycles

marsh sleet Jan 2, 2020, 6:48 PM

#

Hello again, need a little help with a function, i wanted to use the strcspn operation, the problem is that i don't know how i can make it start (in the string) from a certain point

#

📎 unknown.png

#

technically it should show 3

#

but it give me this

📎 unknown.png

vast cosmos Jan 2, 2020, 6:51 PM

#

why would you expect it to show 3 ?

#

the first character in ch1[3]="4567s" is "4", which is not included in the character set ch2="s", so it only spanned that one single character, hence 1.

marsh sleet Jan 2, 2020, 6:53 PM

#

i though it would show me when the character of ch2 appeared in ch1

#

It seem i didn't understood the purpose of strcspn

vast cosmos Jan 2, 2020, 6:53 PM

#

it returns the index of the first character NOT in ch2

#

from the manpage: In other words, it computes the string array index of the first character of s which is not in charset, else the index of the first null character.

marsh sleet Jan 2, 2020, 6:54 PM

#

oh... so i would need to use strspn ? (i'm using french documentation, so i'll try to see on manpage)

vast cosmos Jan 2, 2020, 6:55 PM

#

well, what are you trying to accomplish? find the index of the first occurrence of a single character?

marsh sleet Jan 2, 2020, 6:56 PM

#

find at which character the string ch2 is in ch1

vast cosmos Jan 2, 2020, 6:56 PM

#

the traditional C method for that is strchr()

#

ch2 will be a string? not just a character?

#

in that case, the traditional method is strstr()

marsh sleet Jan 2, 2020, 6:57 PM

#

well, it is just a character, but isn't it the same since it's a ch[] ?

vast cosmos Jan 2, 2020, 6:57 PM

#

no, a char is different than a char[]

marsh sleet Jan 2, 2020, 6:57 PM

#

oh okay

#

but does strchr give a int ?

#

or a char ?

#

(or a char*)

vast cosmos Jan 2, 2020, 6:58 PM

#

it will return an integer index

marsh sleet Jan 2, 2020, 6:59 PM

#

so then i could use the atof function to get a int from the integer index right ?

north stream Jan 2, 2020, 6:59 PM

#

I think strchr() returns a pointer to the matching character, not an index

#

index() returns the index of the first match

marsh sleet Jan 2, 2020, 7:00 PM

#

index and strchr are different ?

#

i though it was just a different name

vast cosmos Jan 2, 2020, 7:01 PM

#

oh right @north stream. so to get the character returned, you would simply dereference the return value like so: char *ch = strchr(str, c); if (NULL != ch) { Serial.println(*ch); }

north stream Jan 2, 2020, 7:01 PM

#

They both find the first matching character, but index() returns the index of the match (or -1 if no match), where strchr() returns a pointer to the match within the string (or NULL if no match)

marsh sleet Jan 2, 2020, 7:02 PM

#

index is the exact thing i was searching for thank you so much

vast cosmos Jan 2, 2020, 7:04 PM

#

so i just submitted my first library (well, 3 libraries) to the Arduino Library Manager index. anyone have any idea how long that takes to get processed and posted?

north stream Jan 2, 2020, 7:05 PM

#

Cool! I have no idea how long such things take, but I would guess it's pretty variable.

vast cosmos Jan 2, 2020, 7:06 PM

#

i'm also curious how making updates works too. how they know which revision to use as the latest and how frequently those are polled

#

quite the PITA to refactor library code to meet their requirements. e.g., source file placement, metadata location and format, etc. it certainly could have been worse, but its something to be aware of -before- finishing the software implementation 🙂

#

newest official arduino release 1.8.10 now has a "depends" attribute in the library metadata that allows libraries to explicitly call out other libraries (in the Library Manager index) it depends on, each of which will be prompted to the user for download if they don't already have them

#

you may have noticed that if you've done any library updates recently. a lot of Adafruit's library packages are starting to utilize that "depends" attribute properly

#

so you'll get a dialog prompt to download some other library when trying to update

north stream Jan 2, 2020, 7:13 PM

#

Hmm, sounds like a good idea, but some extra work, especially if you didn't design for it.

vast cosmos Jan 2, 2020, 7:20 PM

#

no idea if it operates recursively, like a proper pkg manager (e.g. dpkg/yum), but it reduces some of the failed compile/link surprises!

fluid wagon Jan 2, 2020, 7:28 PM

#

Link errors are good for the soul

marsh sleet Jan 2, 2020, 7:32 PM

#

when you said the function index(), you mean indexOf() ?

#

i can't find any documentation of index() with arduino

rocky igloo Jan 2, 2020, 7:38 PM

#

From Linux man pages:

#

The index() function returns a pointer to the first occurrence of the character c in the string s.

#

The strchr() function returns a pointer to the first occurrence of the character c in the string s.

#

POSIX.1-2008 removes the specifications of index() and rindex(), recommending strchr(3) and strrchr(3) instead.

marsh sleet Jan 2, 2020, 7:40 PM

#

but will index() work with arduino ?

#

the IDE don't seem to interpret it

rocky igloo Jan 2, 2020, 7:41 PM

#

Then I guess it won't. The build system gets the last word on that. 😁

#

Does strchr() work?

marsh sleet Jan 2, 2020, 7:42 PM

#

it does, but i need to get a int, and strchr give me a pointer

#

maybe i can convert it to a int

rocky igloo Jan 2, 2020, 7:42 PM

#

Pointer arithmetic -- subtract the address of the string from the return value.

marsh sleet Jan 2, 2020, 7:43 PM

#

so when i have my pointer, i just do - Text[] ?

rocky igloo Jan 2, 2020, 7:44 PM

#

You don't need the [].

marsh sleet Jan 2, 2020, 7:45 PM

#

but i can't subtract a char from a char right ?

rocky igloo Jan 2, 2020, 7:46 PM

#

#include <stdio.h>
#include <string.h>

int main(void)
{
  char s[] = "abcdef";
  char *res = strchr(s, 'c');
  printf("%ld\n", res - s);

  return 0;
}```

#

Output is "2".

vast cosmos Jan 2, 2020, 7:47 PM

#

why do you need an int @marsh sleet ?

marsh sleet Jan 2, 2020, 7:48 PM

#

it was because i wanted to count (using a != operator with a while), but i guess a char could work

vast cosmos Jan 2, 2020, 7:50 PM

#

also, a simple loop would work: char s[] = "abcdef"; char *c = (char *)s; for (int i = 0; NULL != *c; ++i, ++c) { if (*c == 'c') { Serial.printf("found 'c' at index %d\n", i); } }

#

but @rocky igloo 's solution is probably the best solution

#

(although i think your format flag needs to be unsigned)

marsh sleet Jan 2, 2020, 7:54 PM

#

his method worked perfectly, but i now need for the strchr to start searching after x

#

so i though that i could use strchr(s[5], 'c'); for example

#

but my Serial told me otherwise

📎 unknown.png

vast cosmos Jan 2, 2020, 7:55 PM

#

well that will dereference, so try s + 5

#

instead of s[5]

rocky igloo Jan 2, 2020, 7:55 PM

#

Or ```c
#include <stdio.h>

int main(void)
{
char *p, s[] = "abcdef";
for (p = s; *p && *p != 'c'; ++p);
printf("%ld\n", p-s);
return 0;
}``` 😁

marsh sleet Jan 2, 2020, 7:56 PM

#

it give me the result like the +5 don't exist

rocky igloo Jan 2, 2020, 7:57 PM

#

You want s + 5.

#

Pointer arithmetic again...

#

Like @vast cosmos said above...

marsh sleet Jan 2, 2020, 7:58 PM

#

like that ?

📎 unknown.png

vast cosmos Jan 2, 2020, 7:59 PM

#

nailed it!

rocky igloo Jan 2, 2020, 7:59 PM

#

Yes

#

  char s[] = "abcdef";
  char *res = strchr(s + 5, 'f');```

#

Prints "5"

marsh sleet Jan 2, 2020, 7:59 PM

#

here is my program for now (to try this out)

📎 unknown.png

#

and it give me 7

rocky igloo Jan 2, 2020, 8:00 PM

#

Oh, I think I see what you mean

#

You're searching starting at character 5 but still subtracting the address of the start of the string.

#

Serial.println(res - ch1 - 5);

marsh sleet Jan 2, 2020, 8:03 PM

#

It worked thank 😄

rocky igloo Jan 2, 2020, 8:03 PM

#

NP

vast cosmos Jan 2, 2020, 8:03 PM

#

to be clear what you're intending, parentheses might help, as in res - (ch1 + 5). that way it matches what you have in strchr()

marsh sleet Jan 2, 2020, 8:04 PM

#

it does seem better than have multiple minus in row

rocky igloo Jan 2, 2020, 8:04 PM

#

That's reasonable.

vast cosmos Jan 2, 2020, 8:04 PM

#

its just a readability thing

marsh sleet Jan 2, 2020, 8:05 PM

#

thank you two you really helped me on that one

rocky igloo Jan 2, 2020, 8:06 PM

#

Good luck with the rest of it.

rotund condor Jan 2, 2020, 8:35 PM

#

im having trouble using the timer interrupt function

#

I need a interrupt to occur every .864 seconds but whatever I do I can't seem to get the math right for TCNT1

#

does anybody have a formula i can double check is the same as the one I'm using

surreal pawn Jan 2, 2020, 8:40 PM

#

@rotund condor On what device?

rotund condor Jan 2, 2020, 8:40 PM

#

atmega 328 on the uno

surreal pawn Jan 2, 2020, 8:42 PM

#

16mHz?

#

  TCCR1A = 0x00 ;
  TCCR1B = 0x00 ;
  TCNT1 = 0x0000 ;
  TCCR1A = 0xA2 ; // fast 16 bit PWM
  TCCR1B = 0x1C ; // prescale /256
  ICR1 = 54000-1 ; // 16000000/256*.864
  TIMSK1 |= 0x01 ;  // overflow int

#

at least that's my guess from https://forum.arduino.cc/index.php?topic=452021.0

Timer1 interrupt exactly one second on 16 Mhz

rotund condor Jan 2, 2020, 8:44 PM

#

let me try that

surreal pawn Jan 2, 2020, 8:45 PM

#

also http://www.gammon.com.au/timers looks worth reading

Gammon Forum : Electronics : Microprocessors : Timers and counters

rotund condor Jan 2, 2020, 8:46 PM

#

that seems to work

#

thank you very much!

surreal pawn Jan 3, 2020, 9:12 AM

#

https://learn.adafruit.com/adafruit-music-maker-shield-vs1053-mp3-wav-wave-ogg-vorbis-player/overview

Adafruit Learning System

Adafruit Music Maker Shield

Play MP3/Ogg/WAV/MIDI and more on any Arduino

#

@pine bramble are your filenames 8.3?

#

the file separator is a forward slash, so "folder/test.mp3" should work

#

https://www.arduino.cc/en/reference/SD

Arduino - SD

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

neat oar Jan 3, 2020, 1:11 PM

#

hell, I was wondering what type of led strip this is ? It is hard to since there is no label

#

📎 IMG_0924.JPG

#

hello*

#

also how do I connect this with Arduino and the power supply

barren scaffold Jan 3, 2020, 2:22 PM

#

If they're anything like Neopixels, then https://learn.adafruit.com/adafruit-neopixel-uberguide/basic-connections may help there. And that page has a big warning to look for the + and - labels on the end of the strip before connecting to anything, since pin configurations can vary.

Adafruit Learning System

Adafruit NeoPixel Überguide

Everything you always wanted to know about Adafruit NeoPixels but were afraid to ask

neon trench Jan 3, 2020, 2:44 PM

#

Hi. I'm trying to migrate a hardware project (8 x 8 x 8 LED cube using the jolliCube board) from an Arduino Uno to an Adafrruit Feather nrf52840. The cube works fine with the Uno, but I'm hoping that after I get things working with the Feather, I can eventually add Bluefruit app support. Unfortunately my engineering + Arduino knowledge is so basic that I'm stuck on getting even the basic test sketch to work. In addition to 5V/USB power + GND, the Uno uses three pins: 10 - for SPI, 13 for SCK, and 11 for MOSI. I first tried wiring things up on the Feather using Feather's 10, 11, and 13, but the test sketch lit up most of the LED lights with none of the expected animation. I then looked at the schematic at: https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/downloads I don't really know enough to read these properly, but I noticed an SCK pin, so I moved 13 to SCK. This lit up all of the LEDs, but still no animation. The Arduino sketch #includes a standard SPI.h library, and the main sketch has only one pin definition: int SPI_CS = 10; to control the MAX7219 on the jolliCube board. I've selected the Feather board & port, and the sketch seems to be uploading. I'm wondering: 1) do I have the pin wiring wrong as I try to move from Uno to Feather nrf52840 Express? 2) do I need to #include any additional libraries to get the Feather to work, or will I need to sniff in these libraries & make additional pin re-mappings to go from Uno to Feather? Again, I pretty much know nothing about the engineering side of things, so any help in trying to understand where I've gone wrong & what needs fixing is most appreciated. Thx! J

Adafruit Learning System

Introducing the Adafruit nRF52840 Feather

The first Bluefruit Feather with USB and CircuitPython support

#

And if it's useful, here's a link to the test program: https://gist.github.com/gallaugher/6565129884d0661abcd47b4c97b08bba

Gist

jolliCube test sketch for Arduino

jolliCube test sketch for Arduino. GitHub Gist: instantly share code, notes, and snippets.

north stream Jan 3, 2020, 3:08 PM

#

@neat oar Looks like it might be a DotStar/SPI style LED strip, just guessing from the markings. If so, Di would be "data in" and Ci would be "Clock in". Unsure about "St" and "Li".

rocky igloo Jan 3, 2020, 5:15 PM

#

@neat oar Can you read anything off any of the integrated circuit packages along the strip? If they say something like "SC6803" or "LPD6803," LED strips with that controller chip have been known to be labeled that way. Apparently they've been around for a while. https://github.com/adafruit/LPD6803-RGB-Pixels

GitHub

adafruit/LPD6803-RGB-Pixels

Controlling library for strands of these pixel dots - adafruit/LPD6803-RGB-Pixels

neat oar Jan 3, 2020, 6:32 PM

#

No I wasn’t able to find any label, just found the led strip in the school

odd fjord Jan 3, 2020, 6:35 PM

#

there is this item - not quite the same but has SI and LI https://learn.adafruit.com/hl1606-led-strip/wiring

Adafruit Learning System

HL1606 LED Strip

Glowy, flexy and addressable!

rocky igloo Jan 3, 2020, 6:48 PM

#

@odd fjord Nice find there. At least that establishes that they stand for strobe and latch, which is something.

wraith current Jan 3, 2020, 7:47 PM

#

@neon trench You should be using the pins on the feather labeled MO and SCK, not 11 and 13. Those are the ones defined for the board and used in the SPI library. Pin 10 should work fine for the CS (chip select).

pine bramble Jan 3, 2020, 8:13 PM

#

https://i.imgur.com/FDeha7x.jpg

Imgur

#

for further clarification @neon trench 👍

#

the SPI library will automatically use these pins

copper oriole Jan 3, 2020, 8:48 PM

#

hello, is there anyone who could kindly help with what to buy to get started? i have a particular project involving a solenoid

wraith current Jan 3, 2020, 9:00 PM

#

@copper oriole that's a bit vague

#

probably need something like this to drive the solenoid https://www.adafruit.com/product/3191

Adafruit Power Relay FeatherWing

A Feather board without ambition is a Feather board without FeatherWings! This is the Power Relay FeatherWing. It gives you power to control, and control over power. Put simply, you can now ...

copper oriole Jan 3, 2020, 9:07 PM

#

@wraith current I'm basically trying to copy this video https://www.youtube.com/watch?v=nwVRMU9grSI (mosfet powering solenoid switched by arduino). But I'm confused on which power supply to get and how to connect it to the breadboard, and whether you need another one for the arduino. I'd like it to run just plugged in to the wall.

YouTube

Matt Inglot

Control a Solenoid with an Arduino (Tutorial)

My complete guide to using your Arduino to control a solenoid! Building a custom pinball machine sent me down the rabbit hole of learning how to control solenoids with a micro controller. It turns out there are a few gotchas to watch out for.

NOTES

The solenoids used are ...

▶ Play video

#

I'm planning on running it for days at a time, so would like a safe and robust connection for the power supply

wraith current Jan 3, 2020, 9:13 PM

#

The solenoid used in that video is 12v and the arduino can take 12v if powered from the barrel jack, so just get a 12v power supply. Don't skimp on the Amp rating though, you need enough power so that the selenoid doesn't drop the voltage too much and brown out the Arduino.

copper oriole Jan 3, 2020, 9:16 PM

#

Does that mean to use a wire to connect the Arduino Vin to the breadboard?

wraith current Jan 3, 2020, 9:17 PM

#

yeah, that should work. The Vin pin is connected directly to he barrel jack, so you can power the whole thing via the barrel jack

copper oriole Jan 3, 2020, 9:20 PM

#

If I get a solenoid with higher voltage, would I then use a separate power supply, and connect that to the breadboard using something like this? https://www.adafruit.com/product/373

Breadboard-friendly 2.1mm DC barrel jack

This power jack is designed to fit 2.1mm power plugs snugly and securely. Perfect for adding a power connector to your project. We went for the more expensive "thin pin" type which ...

#

@wraith current does this look like an adequate sparkfun order? thanks for your help.

📎 unknown.png

#

added some diodes.... and a multimeter

wraith current Jan 3, 2020, 9:35 PM

#

does the power supply have the right barrel connector ?

copper oriole Jan 3, 2020, 9:37 PM

#

i just realised that... it has ATX connector, maybe I should just get something off amazon?

wraith current Jan 3, 2020, 9:38 PM

#

the sparkfun version with barrel connector is out of stock. I assume you're trying to do this without having to solder ?

copper oriole Jan 3, 2020, 9:38 PM

#

yes, ideally

#

i could just get this thing https://www.amazon.com/TMEZON-Power-Adapter-Supply-2-1mm/dp/B00Q2E5IXW

wraith current Jan 3, 2020, 9:39 PM

#

you could get this https://www.sparkfun.com/products/14933 . The solenoid will probably still work on 9v or you could try to find a 9v solenoid.

Power Supply - 54W, 9V

This power supply is a highly reliable desktop style single-output green adapter. It is designed with a low/no load power consumption (less than 0.075W) an

copper oriole Jan 3, 2020, 9:41 PM

#

i think the solenoid won't be powerful enough at 9V. 12V may not even be enough. But going 12V allows both the arduino and solenoid to be powered from the same supply if it happens to be enough

#

Do you think the amazon power supply would work?

#

the solenoid supposedly draws 650mA at 12V, so 2A should be enough

wraith current Jan 3, 2020, 9:43 PM

#

Technically it should work, but it looks a little bit small to really be able to supply 2A

#

Should be ok.

copper oriole Jan 3, 2020, 9:44 PM

#

Well apparently 1A will do

#

Don't really want to spend too much on this one in case I end up needing to buy a separate 24V or 36V supply for the solenoid

#

Then it would only be powering the arduino which i assume is tiny current

wraith current Jan 3, 2020, 9:45 PM

#

What's the solenoid going to push anyway ?

copper oriole Jan 3, 2020, 9:45 PM

#

its going to mash buttons

#

lots of buttons for long times

#

button fatigue tester

wraith current Jan 3, 2020, 9:46 PM

#

oh cool.

copper oriole Jan 3, 2020, 9:46 PM

#

yeah huge brain project i know

#

thanks for ur help do u want some cash

wraith current Jan 3, 2020, 9:46 PM

#

no worries. Glad to help.

#

would love to see a video of the finished product mashing the buttons though 😉

copper oriole Jan 3, 2020, 9:49 PM

#

Ok I will add you and send when happened

#

The buttons are custom product I am making

#

Mass production!!!!

north stream Jan 3, 2020, 9:53 PM

#

If you're using an ATX power supply SparkFun offers this to use it as a general purpose power supply https://www.sparkfun.com/products/12867

SparkFun Benchtop Power Board Kit

You don’t have the power? Well, there’s no need to ask Scotty – the SparkFun Benchtop Power Board Kit has your back. This board will let you take adv

copper oriole Jan 3, 2020, 9:59 PM

#

@north stream thanks but i think i go with the barrel connectors, my brain is too small for soldering

#

also what other cute things can i bundle into this sparkfun order

north stream Jan 3, 2020, 10:02 PM

#

I don't think the barrel jack you posted will work with a breadboard, it's designed to be soldered. For breadboard use, I recommend something like https://www.adafruit.com/product/368

Female DC Power adapter - 2.1mm jack to screw terminal block

If you need to connect a DC power wall wart to a board that doesn't have a DC jack - this adapter will come in very handy! There is a 2.1mm DC jack on one end, and a screw terminal block ...

#

There's also https://www.adafruit.com/product/373

Breadboard-friendly 2.1mm DC barrel jack

This power jack is designed to fit 2.1mm power plugs snugly and securely. Perfect for adding a power connector to your project. We went for the more expensive "thin pin" type which ...

#

Oops, I'm wrong, that's the one you posted. Yeah, that will work

copper oriole Jan 3, 2020, 10:03 PM

#

im getting this one https://www.sparkfun.com/products/10811

DC Barrel Jack Adapter - Breadboard Compatible

This DC power jack/connector is just like the other one that we carry except that it's terminated with breadboard-friendly pins instead of wide solder term

#

its the same i think ye

#

thanks though

#

its cool what u can make without even soldering these days!!!

neon trench Jan 3, 2020, 10:42 PM

#

@wraith current & @pine bramble huge thanks! The test sketch is now working on the Feather and is driving the jolliCube & the lights are cycling through, top to bottom, as expected. Unfortunately I can't get the demo sketch with animations running on the Feather, though. It runs fine on the Uno, but I get the error output from Arduino shown in the gist, below. https://gist.github.com/gallaugher/96fb2079be5cfd33be5163d03d3ba536 The exact same sketch runs fine on the Uno if I switch the wiring, select Uno as the board, and select the proper Uno port, but doing the same with the proper Feather nrf52840 board & port gives me those errors. While I've been able to cobble together code modifications in Arduino in the past, I'm not savvy enough with the platform to get a sense of what's happening here. These errors look like syntax errors to me, but apparently not if they run fine & unmodified in the Uno. I've also included a screenshot below - same as the first part of the error output & copied into the gist at the URL, above.

Gist

Errors trying to run MD-Cubo arduino sketch that works for Uno, on...

Errors trying to run MD-Cubo arduino sketch that works for Uno, on a Feather nrf52840 - Error_Output

#

📎 jolliCube_error.png

north stream Jan 3, 2020, 10:49 PM

#

Looks like either you need another header file to define those things, or your CPU has them with different names, and you'd have to adjust the code to match.

surreal pawn Jan 3, 2020, 11:58 PM

#

it won't call whichsong() inside of the string like that

surreal pawn Jan 4, 2020, 12:46 AM

#

I don't understand what you're asking

#

I don't have a arduino within reach to test on, but here's what you might do instead

#

int whichsong(int thissong) {
  int result = thissong + 1;
  if (result > 5) {
    result = 0;
  }
  return result;
}

void setup() {
  Serial.begin(9600);
}

void loop() {
  int thissong = 1;
  String path = "songs/";
  path = path + whichsong(thissong);
  Serial.println(path);
}

north stream Jan 4, 2020, 2:16 AM

#

When I did something like that, I went through the files and counted how many were the right type. Then I'd pick a random number in that range, go through the files until I got to that one, and play it. That meant I didn't need to keep the list in memory, with the tradeoff that I would have to go through the files again every time I wanted to play a new track.

surreal pawn Jan 4, 2020, 2:17 AM

#

@pine bramble the string constructor can convert numbers to strings. the concatenation line should auto-convert the number to a string but it could be string path = path + String(whichsong(thissong)); instead to be direct or maybe you want to pass other arguments to the string constructor

#

you could also just lookup in an array:

#

const int num_files = 4;
const char* const mp3files[num_files] PROGMEM = {
  "foo/0.mp3",
  "foo/1.mp3",
  "foo/2.mp3"
  "foo/3.mp3"
};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  int n = 0;
  while(true) {
    // n should be from 0 to (num_files - 1)
    Serial.println(mp3files[n]);
    delay(100);
    n++;
    if (n >= num_files) {
      n = 0;
    }
  }
}```

north stream Jan 4, 2020, 2:26 AM

#

I'm not sure the names in an array approach would work since it has to figure out some of the filenames on the fly

ruby rampart Jan 4, 2020, 2:30 AM

#

hmm, the page doesn't say, but I'm assuming the ItsyBitsy nRF52840 can be powered at 5v 1A?

#

oh, there, it says 3.3v

neon trench Jan 4, 2020, 2:35 AM

#

OK, when hunting in the code it looks like the errors are coming from a file deep in the library named "MD_Cubo_8x8_ICS574.cpp". And when I look at the code, this seems to be the area where the errors are triggered. What's happening here is definitely beyond my expertise, but I'm hopeful someone might recognize what this refers to & can point me to an appropriate reference to make changes for the Feather nrf52840. Thanks:

#

// everything works direct on the uP ports.
void MD_Cubo_ICS574::begin(void)
{
int i;

for(i=0; i<14; i++)
pinMode(i, OUTPUT);

// pinMode(A0, OUTPUT) as specified in the arduino reference didn't work. So I accessed the registers directly.
DDRC = 0xff;
PORTC = 0x00;

// Reset any PWM configuration that the arduino may have set up automagically!
TCCR2A = 0x00;
TCCR2B = 0x00;
TCCR2A |= (0x01 << WGM21); // CTC mode. clear counter on TCNT2 == OCR2A
OCR2A = 10; // Interrupt every 25600th cpu cycle (256*100)
TCNT2 = 0x00; // start counting at 0
TCCR2B |= (0x01 << CS22) | (0x01 << CS21); // Start the clock with a 256 prescaler
TIMSK2 |= (0x01 << OCIE2A);
}

north stream Jan 4, 2020, 2:38 AM

#

The port changes are probably fairly simple (the pinMode() comment gives a clue what they're intended to do, so you can probably replace those with pinMode()). The PWM/timer configuration is likely to be more tricky.

#

Looks like it's supposed to interrupt at a regular rate (every 1.6ms, assuming the Arduino was a standard 16MHz one).

wraith current Jan 4, 2020, 5:26 AM

#

@neon trench I think you have some weird extra cruft code that you don't need. The jolicube is commuincating over SPI so there is no need to setup all those pin outputs nor initialize an ICS574 chip since the jollicube does not use an ICS574

#

you can probably get away with editing that function by deleting all of its contents and going along your merry way.

#

Mainly thats ok because that function never gets called in the first place.

pine bramble Jan 4, 2020, 3:18 PM

#

Hey everyone - I'm new here so not sure if this is the right channel but I am taking my EdgeBadge through the examples and am trying magic_wand_arcada. When the code is done uploading to the board, I get this error - does anyone know what I am doing wrong?:
No filesystem found! For QSPI flash, load CircuitPython. For SD cards, format with FAT
magic_wand just works as expected. I am working on OSX. Thanks in advance
FYI I also had some trouble doing this example: https://learn.adafruit.com/tensorflow-lite-for-edgebadge-kit-quickstart/customized-wave-demo
It required 2 resets to get the usb drive to appear.

surreal pawn Jan 4, 2020, 3:26 PM

#

did you put the bitmaps onto the CIRCUITPYTHON drive as described in the learn.adafruit guide?

#

if not, maybe it's complaining it can't find them. The demo should still work, but it will just show a letter on screen instead of the bitmap + sound

pine bramble Jan 4, 2020, 3:34 PM

#

I had to double reset to get a drive to put the bitmaps on - not single reset as shown in the example. The drive is called PYBADGEBOOT and contains CURRENT.UF2, INDEX.HTM AND INFO_UF2.TXT - its not empty as shown in the example. If I double reset and put those files on the drive, then reset, I get the original error 'No filesystem...'

surreal pawn Jan 4, 2020, 3:41 PM

#

no, that's the wrong drive. PYBADGEBOOT and the UF2 files are how you'd upload new programs from things that aren't arduino, such as updating circuitpython or putting a game from makecode on

#

you can upload the circuitpython for pybadge .uf2 file to get the circuitpython drive, but you should also be able to get the circuitpython drive by uploading an arduino sketch with the usb library set to tinyusb perhaps with some additional code

pine bramble Jan 4, 2020, 3:44 PM

#

I have tried uploading this one yesterday but I got the same result - is this what u mean? adafruit-circuitpython-edgebadge-en_US-5.0.0-beta.2.uf2

surreal pawn Jan 4, 2020, 3:45 PM

#

sure, if you copy adafruit-circuitpython-edgebadge-en_US-5.0.0-beta.2.uf2 to the PYBADGEBOOT drive that shows up when you double-press reset then it will reboot to circuitpython, and the circuitpython drive will appear

#

OR, you can upload the arduino sketches for the edgebadge demos you were trying, but you need to change the USB stack to TinyUSB https://learn.adafruit.com/tensorflow-lite-for-edgebadge-kit-quickstart/setup-for-compiling-examples

Adafruit Learning System

TensorFlow Lite for EdgeBadge Quickstart

Get going quickly with your TensorFlow Lite kit!

#

oh, and that specific error you were getting might be because the filesystem can only be mounted in one place: Either to your computer, or to the software on the badge

#

so after you copy the files to the circitpython drive you need to safely remove or eject it then reboot the badge (you can leave the usb cable connected) and then the images/sounds should work

pine bramble Jan 4, 2020, 3:48 PM

#

When I upload adafruit-circuitpython-edgebadge-en_US-5.0.0-beta.2.uf2 it says Code done running. waiting for reload

#

Also, I had already changed to tinyusb, btw

surreal pawn Jan 4, 2020, 3:49 PM

#

are you on windows?

pine bramble Jan 4, 2020, 3:49 PM

#

no OSX

#

sorry Mac OS 10.15.2

#

am I doomed?

surreal pawn Jan 4, 2020, 3:50 PM

#

I'm on 10.14

pine bramble Jan 4, 2020, 3:50 PM

#

I saw there was a patch for your version, but I checked the file and had the right version already

surreal pawn Jan 4, 2020, 3:54 PM

#

looks like I don't have the tensorflow libraries installed on this computer

#

anyway, which one were you at?

#

magic_wand_arcada

pine bramble Jan 4, 2020, 3:56 PM

#

I also have an older macbook with 10.14.5 on - I could install everything there and try again. By the way, after I safely ejected the drive and reset the EdgeBadge, it still says code done running. Waiting for reload

#

yes magic_wand_arcada

surreal pawn Jan 4, 2020, 3:57 PM

#

eh, just wait for me to catch up I guess

#

when you plug it in after circutpython does the circuitpython drive show up?

pine bramble Jan 4, 2020, 3:58 PM

#

k - thank you so much for helping me with this! ❤️

#

yes the drive shows up

#

when i paste the new files onto it and reset the board those new files disappear

surreal pawn Jan 4, 2020, 3:59 PM

#

paste the new files onto which drive?

pine bramble Jan 4, 2020, 4:00 PM

#

CIRCUITPY

#

once I have run adafruit-circuitpython-edgebadge-en_US-5.0.0-beta.2.uf2 , do I need to reupload magic_wand_arcada?

surreal pawn Jan 4, 2020, 4:01 PM

#

sure, but first let's try to figure out why your files aren't persisting

pine bramble Jan 4, 2020, 4:01 PM

#

The board does not seem to move on from code done running. Waiting for reload after running circuit python

#

k

surreal pawn Jan 4, 2020, 4:02 PM

#

can you try ejecting (right-click on drive and choose eject) the CIRCUITPYTHON drive before rebooting the board?

pine bramble Jan 4, 2020, 4:03 PM

#

It gives the same error message once rebooted, after ejecting

#

should i do more steps before, or just eject and reboot from here by the way?

#

well, not error message, info message I guess

surreal pawn Jan 4, 2020, 4:06 PM

#

yeah I'm not concerned that circuitpython is giving you that message. On mine circuitpython 5 doesn't work with the example code that came with the badge because the libraries changed slightly

#

do your files stick around?

pine bramble Jan 4, 2020, 4:07 PM

#

yes!

surreal pawn Jan 4, 2020, 4:08 PM

#

nice. I'm now at https://learn.adafruit.com/tensorflow-lite-for-edgebadge-kit-quickstart/gesture-demo#arcada-display-output-gesture-demo-compile-and-upload-5-18

Adafruit Learning System

TensorFlow Lite for EdgeBadge Quickstart

Get going quickly with your TensorFlow Lite kit!

#

it takes a while to build

pine bramble Jan 4, 2020, 4:09 PM

#

should i try to upload again?

surreal pawn Jan 4, 2020, 4:09 PM

#

yeah

pine bramble Jan 4, 2020, 4:09 PM

#

yes, doesn't it...

#

and you can check it, then upload compiles again and it takes twice as long..

#

ah well

#

so during upload the first time, do you get an error?

#

it seems to take two tries for me to upload to the board

surreal pawn Jan 4, 2020, 4:12 PM

#

I double-pressed the reset button to get PYBADGEBOOT and chose the serial port again before uploading

pine bramble Jan 4, 2020, 4:12 PM

#

the board gets ejected during upload, then i see the pybadge screen on the edgebadge, then error

#

k

surreal pawn Jan 4, 2020, 4:12 PM

#

I'm getting compile errors on the magic_wand_arcada. I'm probably missing another library

pine bramble Jan 4, 2020, 4:13 PM

#

you have to change two variables from 1 to 0

#

those are listed in the error message

#

they are both in the same file

#

there might also be warnings about duplicate libraries but it seems to choose one and move on

surreal pawn Jan 4, 2020, 4:14 PM

#

/Users/nick/Documents/Arduino/libraries/Adafruit_Arcada_Library/Adafruit_Arcada_USBMSD.cpp:52:13: error: 'class Adafruit_USBD_Device' has no member named 'detach'

pine bramble Jan 4, 2020, 4:14 PM

#

I am back to the original error message, No filesystem found, after uploading again

surreal pawn Jan 4, 2020, 4:15 PM

#

I guess I need to update the boards like I hit last time.

pine bramble Jan 4, 2020, 4:17 PM

#

yes it seems like a mismatch in versioning i guess

surreal pawn Jan 4, 2020, 4:21 PM

#

it's working for me without the images and I'm not getting your device error

pine bramble Jan 4, 2020, 4:22 PM

#

oh man

#

thanks for checking

#

what can i do, do u think?

surreal pawn Jan 4, 2020, 4:23 PM

#

after uploading try plugging it into another computer maybe?

pine bramble Jan 4, 2020, 4:23 PM

#

or like - just usb to the wall maybe? is that about the same?

surreal pawn Jan 4, 2020, 4:23 PM

#

sure, or if you have a battery to plug in

#

also try the magic_wand example . that one just prints to serial

#

check for board and library updates

pine bramble Jan 4, 2020, 4:24 PM

#

still the same error when plugged into a regular outlet

#

yes th magic wand works

#

i thought maybe i should just live with this issue, but i kindoff wanted the board for tensor flow experimentation and i thought maybe it would be handy to have the file system aspect working

surreal pawn Jan 4, 2020, 4:26 PM

#

yeah, the magic_wand_arcada demo should show up as the CIRCUITPYTHON drive when plugged in and mine does

#

it sounds like you've already selected tinyusb. I don't know what else to suggest

pine bramble Jan 4, 2020, 4:26 PM

#

i will try it on my older macbook pro tonight - maybe thats it

#

thanks so much for your guidance, at least i know i didn't do anything really wrong

#

when you say board updates, what should i look for?

#

like the libraries in arduino ide?

#

anything else?

surreal pawn Jan 4, 2020, 4:27 PM

#

I mean you go to the board manager and on the top left switch to showing "updatable" boards

#

you can do the same in the library manager

#

but if everything compiles it should be fine

pine bramble Jan 4, 2020, 4:28 PM

#

i can update arduino avr to 1.8.2 from 1.8.1 and adafruit samd from 1.5.7 to 1.5.9

#

i'll try that

surreal pawn Jan 4, 2020, 4:29 PM

#

updating the avr boards won't change anything with this samd board but it won't hurt either

pine bramble Jan 4, 2020, 4:29 PM

#

i figured, thx

#

well, same result after updating - maybe i need to log a ticket or something

#

thanks again for your help! I am open to suggestions if you think of anything later

neon trench Jan 4, 2020, 4:48 PM

#

@wraith current you were right. If I commented out the code related to the ICS574 in the libraries, the problems stopped. And @north stream your suggestion was great, too. I swapped out the calls to pins 11 and 13 for: const uint8_t DATA = MOSI; ///< SPI Data pin number
const uint8_t CLK = SCK; ///< SPI Clock pin number

#

Now the base demo code works. There still seem to be problems with the MD_Cubo library, but I've reached out to the author since I can't seem to find where the gap is. Huge thanks, again, for your help!

paper nimbus Jan 4, 2020, 5:26 PM

#

What would be the right terminology to describe a function/thread that repeats vs one that runs once after being called? Cycle vs momentary? Cyclic, acyclic? Periodic?

pine bramble Jan 4, 2020, 8:40 PM

#

@paper nimbus That sounds a little bit like everyone's pet word several years ago: recursion.

tough snow Jan 4, 2020, 9:48 PM

#

Has anyone here fiddled with TVOut?

#

I'm trying to get it to work on a 1284p, and it... sort of does. Except the sync is all sorts of bad.

#

Hm, seeing a notice that it's a thing that's been found before.

surreal pawn Jan 5, 2020, 3:41 AM

#

I'm unable to save state in https://github.com/adafruit/nofrendo_arcada on edgebadge

GitHub

adafruit/nofrendo_arcada

NES emulator in Arduino that runs on SAMD51 at full speed w/audio - adafruit/nofrendo_arcada

#

the serial output doesn't say much helpful

    ArcadaFileSys : open abs path '/nes'
Select -> /nes/2048.nes
Selected: /nes/2048.nes
DMA create
DMA descriptor #0 $2000AFA8
DMA descriptor #1 $2000CDA8
DMA descriptor #2 $2000EBA8
DMA descriptor #3 $200109A8
DMA kickLoadROM: /nes/2048.nesDMA stop
    ArcadaFileSys : open abs path '/nes/2048.nes'
Filesize : 16400 bytes
319488 bytes available
Storing-....-....-.Verifying!



 into address $00032000DMA create
DMA descriptor #0 $2000AFA8
DMA descriptor #1 $2000CDA8
DMA descriptor #2 $2000EBA8
DMA descriptor #3 $200109A8
DMA kickSound init
emu_Malloc: successfully allocated 916 bytes
FileOpen: /nes/2048.nes    ArcadaFileSys : open abs path '/nes/2048.nes'
...Success!
Alloc ROMinfo...emu_Malloc: successfully allocated 4136 bytes
rom_load: rominfo->filename
Alloc SRAM...emu_Malloc: successfully allocated 8192 bytes
Alloc VRAMemu_Malloc: successfully allocated 8192 bytes
SRAM load not yet supported
ROM loaded
emu_Malloc: successfully allocated 916 bytes
    ArcadaFileSys : Exists? '/nes/2048.nes.sav'
    ArcadaFileSys : open abs path '/nes/2048.nes.sav'
AAStaStaQuit!
DMA stop
DMA create
DMA descriptor #0 $2000AFA8
DMA descriptor #1 $2000CDA8
DMA descriptor #2 $2000EBA8
DMA descriptor #3 $200109A8
DMA kickStaStaQuit!
DMA stop
    ArcadaFileSys : Exists? '/nes/2048.nes.sav'
    ArcadaFileSys : open abs path '/nes/2048.nes.sav'
Saving state to file:/nes/2048.nes.sav
Assert machine
state_save: fn=/nes/2048.nes.sav
    ArcadaFileSys : open abs path '/nes/2048.nes.sav'
OpenFile write pos/size: 0/0

tiny hawk Jan 5, 2020, 6:10 PM

#

Anybody know how to correctly use the dual adcs with the itsy bitsy m4? Is it possible to read both of them at the same time? If not what's the benefit of having two adcs on there exactly?

wraith current Jan 5, 2020, 8:04 PM

#

@tiny hawk are you having issues with using both ADC's ? Technicaly, unless your running multithreaded programming with multiple cores, any processor has to do one instruction after another so you can't run two analog-digital conversions at the same exact time.

cedar mountain Jan 5, 2020, 8:12 PM

#

I think on that MCU, there's an event system which can trigger the ADC conversion, so you probably can arrange for both ADCs to run simultaneously. Whether the driver library supports that, I don't know.

tiny hawk Jan 5, 2020, 8:28 PM

#

@wraith current No, I'm not having any particular issue, just wondering why there are two on there if the micro can only execute analogRead one after another. Especially because having multiple adcs on one mcu is something pretty special as far as arduino is considered.
@cedar mountain will be looking for some info on the event system. Would be neat to have them both trigger simultaneously. Can you recommend me something to look into here except the datasheet?

cedar mountain Jan 5, 2020, 9:06 PM

#

I can't, I'm afraid, as I've not used the chip before myself.

#

Though it may be overkill, as triggering them one after another would be a delay of a small fraction of the conversion time anyway, so it would be negligible for signals of any bandwidth they can handle.

pine bramble Jan 5, 2020, 10:28 PM

#

The SAM D5x/E5x has two ADC instances, ADC0 and ADC1. The two inputs can be sampled simultaneously, as each ADC includes sample and hold circuits.

tiny hawk Jan 5, 2020, 10:35 PM

#

@pine bramble thanks for confirming. Though, that's probably not working with the arduino ide, I would guess.

pine bramble Jan 5, 2020, 10:35 PM

#

To avoid data loss, if more than one channel is enabled, the conversion result must be read as soon as it is available (INTFLAG.RESRDY). Failing to do so will result in an overrun error condition, indicated by the OVERRUN bit in the Interrupt Flag Status and Clear register (INTFLAG.OVERRUN).

#

You may want to look at https://start.atmel.com.

#

Not a lot of vendors are coding for SAMD51 support. ;)

#

Also, not everyone who develops for SAMD51 publishes.

wraith current Jan 6, 2020, 6:22 AM

#

@tiny hawk plenty of reasons to have more than one adc though. For example, you could have a device where your need to read battery voltage and also read from another analog sensor.

tiny hawk Jan 6, 2020, 11:29 AM

#

@wraith current huh looks like I don't get something fundamental here. Why not just change the analog read pin when you want to read multiple inputs one after another?

pine bramble Jan 6, 2020, 12:30 PM

#

Ok, having given up a little on doing it in python, did any of you guys try coding a CPX as a IR to USB-serial passthrough?

quartz furnace Jan 6, 2020, 5:49 PM

#

Pyportal Pynt ... do I select “Pyportal “ in the Ardunio board selection? I’m just clarifying because I see a Titano selection for that board — and of course the original PyPortal would use “Pyportal

wraith current Jan 6, 2020, 6:16 PM

#

@tiny hawk on most boards the adc pin is dedicated and you can't change it

pine bramble Jan 6, 2020, 6:32 PM

#

There is internal 'stuff' you can route to ADC so it's not always reading off an external pin, if I understand things correctly.
You might want to monitor on-MCU temperature (I think that's one of them) for example.

rocky igloo Jan 6, 2020, 6:46 PM

#

@tiny hawk Arduino still basically has a "let's all pretend we're still using an ATmega" programming model so you're on your own for anything beyond that, but it isn't super difficult. I've remapped ADC pins on a SAMD21 to multiplex the one converter between several inputs, and a SAMD51 is the same idea. Look at analogRead() in packages/adafruit/hardware/samd/1.5.3/cores/arduino/wiring_analog.c, pinPeripheral() in packages/adafruit/hardware/samd/1.5.3/cores/arduino/wiring_private.c, and g_APinDescription[] in packages/adafruit/hardware/samd/1.5.3/variants/itsybitsy_m4/variant.cpp. You'll have to put your thinking cap on but it can be done. It isn't all that complicated really.

#

@pine bramble posted while I was digging out those links. Yes, "internal stuff" is the way to get it done. And you'll notice that analogRead() in the library enables and initializes the ADC before each read then disables it when it's done. You probably wouldn't want this if you care about sampling rate. Once you get them started, you can leave both of them running, poll regularly to see if a new result is available, and grab it out of the data register if it is.

pine bramble Jan 6, 2020, 6:54 PM

#

🛬

tiny hawk Jan 6, 2020, 11:21 PM

#

Thank you guys, that's been really helpful!

pine bramble Jan 7, 2020, 4:36 AM

#

Arduino and putty:
I'm using a Playground Express to send serial data over USB to my PC. It's connected to putty.
The CPX receives a telegram on IR from another CPX, [4,1, 255,255] then send it via serial to putty, but what I see on my terminal is: 16617583.
How do I interpret that?

#

This is my IR-receive -> Serial send code:
'''

#

Just trying to format like code, hang on.

#

  //Continue looping until you get a complete signal received

  if (CircuitPlayground.irReceiver.getResults()) {

    CircuitPlayground.irDecoder.decode();           //Decode it

    //CircuitPlayground.irDecoder.dumpResults(false);  //Now print results. Use false for less detail

    IR_value = CircuitPlayground.irDecoder.value;

    IR_protocol=CircuitPlayground.irDecoder.protocolNum;

    if (IR_protocol){      

      Serial.println(IR_value,DEC);

    }    

    CircuitPlayground.irReceiver.enableIRIn();      //Restart receiver

neat oar Jan 7, 2020, 1:00 PM

#

Hey, how can I make individual key buttons play piano notes

#

I am not sure how do code should be

surreal pawn Jan 7, 2020, 1:59 PM

#

@neat oar on what device?

neat oar Jan 7, 2020, 1:59 PM

#

Arduino micro

surreal pawn Jan 7, 2020, 2:01 PM

#

https://www.arduino.cc/en/Tutorial/ToneKeyboard?from=Tutorial.Tone3

Arduino - ToneKeyboard

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

#

it's probably easier to start with just playing tones: https://www.arduino.cc/en/Tutorial/ToneMelody?from=Tutorial.Tone

Arduino - ToneMelody

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

#

good luck. I'm going to get more sleep

idle fossil Jan 7, 2020, 2:28 PM

#

Is there a method to get a copy of the epd library display buffer? I'm trying to make a simple clock refresh function w/o having to recalculating all of the other parts of the the screen (since partial refresh isn't supported). I'm using a HUZZAH32 with the tricolor FeatherWing and would like the clock function to either run in the Ultra Low Co Processor or at beginning of a deep sleep wake up.

odd fjord Jan 7, 2020, 2:32 PM

#

@idle fossil are you looking for the source code? -- it's here https://github.com/adafruit/Adafruit_EPD

idle fossil Jan 7, 2020, 2:36 PM

#

@odd fjord I've looked at the source code but to the best of my understanding I could only suspect that the answer probably revolves around the MCPSRAM_READ function. Unless I've missed something obvious.

odd fjord Jan 7, 2020, 2:37 PM

#

OK -- sorry -- you've gone way beyond anything I can help with. Hopefully someone else can help. Good luck!

vast cosmos Jan 7, 2020, 4:24 PM

#

the Arduino folks on github arent exactly aggressive in keeping up with Library Manager addition requests huh

#

put my libraries up 5 days ago, and mine isnt even half as old as the oldest request

neat oar Jan 7, 2020, 7:03 PM

#

Sorry to bother you guys, I am so bad at programming arduino

#

right now i have this code

#

by Tom Igoe

This example code is in the public domain.

http://www.arduino.cc/en/Tutorial/Tone
*/

#include "pitches.h"

// notes in the melody:
int melody[] = {NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, NOTE_B3, NOTE_C4};
int buttonPin = 12;
int noteDurations[] = {4, 8, 8, 4, 4, 4, 4, 4}; // note durations: 4 = quarter note, 8 = eighth note, etc.:

void setup() {

pinMode(buttonPin,INPUT);
}

void loop() {

int buttonState = digitalRead(buttonPin);
if(buttonState == 1)
{
for (int thisNote = 0; thisNote < 8; thisNote++)
{
int noteDuration = 1000 / noteDurations[thisNote];
tone(8, melody[thisNote], noteDuration);
int pauseBetweenNotes = noteDuration * 1.30;
delay(pauseBetweenNotes);
noTone(8);
}

Arduino - ToneMelody

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

#

So my question is how can I tweak it so that if i add 2 more buttons, each button will play one melody

acoustic nebula Jan 7, 2020, 7:11 PM

#

@vast cosmos my library requests averaged 8 days each

rocky igloo Jan 7, 2020, 7:15 PM

#

@idle fossil I just looked through the library source a little bit (I don't even have an e-paper display, just curious...) and at line 154 of Adafruit_EPD.h you'll see Adafruit_MCPSRAM sram;. That declares an object to control a RAM chip connected through SPI on the display. The methods for that class are in Adafruit_MCPSRAM.h and Adafruit_MCPSRAM.cpp. The function Adafruit_EPD::drawPixel() about halfway down in Adafruit_EPD.cpp accesses display memory using the sram.read8() and sram.write8() functions.

#

And that's all I know about it, or probably more than I know about it really. But maybe it'll get you a bit further along. Good luck with your project!

vast cosmos Jan 7, 2020, 7:26 PM

#

@neat oar do you understand how the code you pasted works?

pine bramble Jan 7, 2020, 11:12 PM

#

Hi everybody, i'm having trouble with Arduino on my Pybadge. When I try to upload ANY sketch to it. It says : fork/exec /Users/USERNAME/Library/Arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-g++: no such file or directory
Error compiling for board Adafruit pyBadge M4 Express (SAMD51). I know something’s wrong with a file or folder but I can't seem to fin anything useful on Google

#

I'm using Arduino 1.8.9 on macOS 10.12.6

pine bramble Jan 7, 2020, 11:34 PM

#

It also does something similar with my Arduino Uno and Nano

mighty vigil Jan 7, 2020, 11:54 PM

#

Based on an internet search, you should try deleting the /Users/username/Library/Arduino15/packages/arduino directory and reinstalling the board (core) from the boards manager.

pine bramble Jan 7, 2020, 11:56 PM

#

ok, i'll try it

#

thanks

pine bramble Jan 8, 2020, 12:25 AM

#

it doesnt work

#

i also tried and updated the ide and all libraries and boards

#

After some other research, i found a solution on https://github.com/arduino/Arduino/issues/5691

GitHub

avr-g++": file does not exist · Issue #5691 · arduino/Arduino

I am trying to compile a simple "BLINK" sketch for Arduino UNO board, using Arduino IDE v1.6.13 on my Win 8.1 OS. But while compiling, the output window shows an error message C:...

#

@mighty vigil Thanks for the effort though!

pine bramble Jan 8, 2020, 1:12 AM

#

Hi everybody, i'm having trouble with Arduino on my Pybadge. When I try to upload ANY sketch to it. It says : fork/exec /Users/USERNAME/Library/Arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-g++: no such file or directory
Error compiling for board Adafruit pyBadge M4 Express (SAMD51). I know something’s wrong with a file or folder but I can't seem to fin anything useful on Google
I'm using Arduino 1.8.9 on macOS 10.12.6

north stream Jan 8, 2020, 2:19 AM

#

You need to install the Arduino SAMD packages as well as the AdaFruit ones: the AdaFruit ones use things (like that missing compiler) from the SAMD packages.

foggy mirage Jan 8, 2020, 2:20 AM

#

can anyone help with this question reg tensorflow on CPB - https://forums.adafruit.com/viewtopic.php?f=58&t=160596

neat oar Jan 8, 2020, 9:47 AM

#

yes I figured it out

#

but i am not sure how to have only individual piano notes for each button

north stream Jan 8, 2020, 3:38 PM

#

Depends on what effect you're going for. Do you want the button to act like the piano key (sound starts when you press the button and stop as soon as you release it), or like a short one-note melody (sound starts when you press the button and ends a fixed time later). Also, do you require polyphony

karmic stream Jan 8, 2020, 3:52 PM

#

is there an equivalent on a baremetal atmega328p that does the same as _WFI/_WFE on arm cortex devices?

#

wait for interrupt/event

acoustic nebula Jan 8, 2020, 3:55 PM

#

pin change interrupt + sleep

karmic stream Jan 8, 2020, 4:31 PM

#

set_sleep_mode(SLEEP_MODE_IDLE);
cli();
sleep_enable();
sei();
sleep_cpu();
sleep_disable();
sei();
``` I'd like to implement my own delay function with this, that's supposed to create an interrupt every millisecond that increments a tick counter

#

and in between every millisecond/interrupt the controller should idle

north stream Jan 8, 2020, 4:42 PM

#

That's doable. You can look at the "tone" function for how to create a tick at a regular interval. Then it's easy enough to write a sleep/wakeup/check if it's time yet routine

karmic stream Jan 8, 2020, 4:46 PM

#

is tone part of arduino or of avr-libc?

#

I'm baremetal on atmega328p

north stream Jan 8, 2020, 4:46 PM

#

I was thinking the Arduino one.

karmic stream Jan 8, 2020, 4:47 PM

#

trying to abstract the delay function over atmega328p and two arm cortex m3/4 microcontrollers

#

using a counter that's incremented every millisecond by an interrupt service routine

north stream Jan 8, 2020, 4:48 PM

#

Right. I wrote some similar code to update DAC values at a regular rate.

#

And (for a different project) to have a scheduler that was in low-power sleep most of the time but would wake up to run tasks when scheduled.

karmic stream Jan 8, 2020, 4:49 PM

#

the generation of the interrupts every ms is currently my problem on the atmega328p, current state is that I'm gonna use a timer there, it seems.

north stream Jan 8, 2020, 4:49 PM

#

Yes, timer interrupts are probably the way to go on that MCU

karmic stream Jan 8, 2020, 4:49 PM

#

I have posted this question on the arduino discord as well

#

so kinda answering in parallel

acoustic nebula Jan 8, 2020, 4:50 PM

#

🙂

north stream Jan 8, 2020, 4:51 PM

#

For reference, the Arduino Tone code is here: https://github.com/arduino/ArduinoCore-avr/blob/master/cores/arduino/Tone.cpp

karmic stream Jan 8, 2020, 4:53 PM

#

thanks

vast cosmos Jan 8, 2020, 5:02 PM

#

yay my Arduino libraries were added to the library manager, took 6 days

neat oar Jan 8, 2020, 6:43 PM

#

@warm spear I would like the button to act like the piano key

north stream Jan 8, 2020, 6:47 PM

#

That will take some more code modification to keep track of which mode it's in (melody or key) and to watch the I/O line to stop the note when the key is released.

willow kelp Jan 9, 2020, 10:06 AM

#

hey Adafruit... anyone has experience working with TOF sensors?
is it normal for them to fluctuate +-3mm?
I'm testing the VL53L0X and VL6180X
Both seem to fluctuate around 3mm

odd fjord Jan 9, 2020, 10:13 AM

#

@willow kelp depending on what you are measuring, that may not be unexpected -- see the table at the bottom of this page https://www.adafruit.com/product/3317

willow kelp Jan 9, 2020, 10:15 AM

#

yeh I'm just testing with a piece of paper for now

#

but it does seem like few mm fluctuation is ok?

odd fjord Jan 9, 2020, 10:18 AM

#

BTW -- I don't represent Adafruit -- for an official response - I suggest posting to the forum https://forums.adafruit.com/viewforum.php?f=19

willow kelp Jan 9, 2020, 10:30 AM

#

cool! thanks!

acoustic nebula Jan 9, 2020, 2:43 PM

#

I've worked with the VL53L0X and seen similar fluctuations

#

it depends on the ambient light, reflectivity and angle of the target, distance to the target and other factors

#

it's a pretty weak infrared laser

vast cosmos Jan 10, 2020, 4:48 AM

#

holy what, when did arduino-cli come out? the arduino IDE has always been the worst thing about arduino

#

this cli tool however is great, actually feels like a modern cli too

neat oar Jan 10, 2020, 9:51 AM

#

Hey, I am using Adafruit to power the following LED strip:

#

📎 IMG_3696.HEIC

#

However, when using the code only one LED lights up and not two

#

I am not sure what could be wrong

north stream Jan 10, 2020, 3:10 PM

#

I don't recognize that LED strip, but it looks like a dotstar or SPI style clock + data one.

shrewd gate Jan 10, 2020, 9:14 PM

#

post your code?

#

Also can you post an image in a format that most people use? 🤔

#

@neat oar ^

north stream Jan 10, 2020, 9:27 PM

#

Yeah, that's the first HEIF image I've seen. Unfortunately I can't read the IC markings in the picture

hidden oracle Jan 10, 2020, 10:17 PM

#

Good evening! Does anyone has a usefull link on 'how to play sound on trinket m0 DAC'? I found the SamdAudio library but the examples are for loading wav files from SD or SPI flash but I just want to load tiny example 'BOING!' sound. I wired my Trinket M0 - DAC to the PAM8302a breakout and connected a speaker ... so I just need some code to get this to work 😕

swift widget Jan 10, 2020, 10:38 PM

#

@sinful saffron I saw you were doing some Modbus TCP stuff. Can you tell me what you ended up doing?

sinful saffron Jan 10, 2020, 10:48 PM

#

@swift widget I used the modbus master library (think it was from here https://drive.google.com/drive/folders/0B0B286tJkafVYnBhNGo4N3poQ2c?tid=0B0B286tJkafVSENVcU1RQVBfSzg ) I used the RS485 shield from https://www.dfrobot.com/product-1024.html . Keep in mind that it uses the serial port of the Arduino. Here is the code I wrote for changing the fan controller speed with a rotary encoder and having an led indicator of the speed:

📎 Rotary_Encoder_2.ino

RS485 Shield For Arduino -DFRobot

Thiis RS485 shield designed for the Arduino is able to convert UART/Serial to RS48. This board allows Arduino communicate with industrial device.

#

There's a ton of different functions for modbus, setting single registers, multiple, reading et cetera (took a while to figure out the local and remote registers lol). It is also recommended to have a maximum 100 ms delay between each update for modbus

north stream Jan 11, 2020, 12:20 AM

#

@hidden oracle Basically you want to set it up to output a sample at a regular rate.

#

I grabbed the timing code from the Arduino Tone library and modified it as a sample clock.

#

It's for an M4 and two channels, but probably could be adjusted to work with the M0 and one channel. https://gitlab.com/bodger/m4-clocked-dac/blob/master/circbuffer.ino

GitLab

circbuffer.ino · master · John Rehwinkel / m4-clocked-dac

GitLab.com

hidden oracle Jan 11, 2020, 12:22 AM

#

thx madbodger! This is a timer controlled (dual) ringbuffer of what I can see (?)

#

For the beginning I am fine just with using the DAC in a propper way and let it play in the main loop

#

What I want to do is a 'anger reducing ENTER-Button' for my co-worker. So I want to use a Trinket M0 as an HID device which spits out an "ENTER" when an emergency button (the mushroom shaped one) is hit. After the "ENTER" I want to play a Homer Simpson "D'OH!"-sound 🙂

#

https://cdn-reichelt.de/bilder/web/xxl_ws/C200/EATON_229748.png

#

like this button

north stream Jan 11, 2020, 1:07 AM

#

I like it! Should be doable

rotund condor Jan 11, 2020, 1:09 AM

#

im trying to program my pro mini wiht my uno but it keeps saying that im not in sync is there anything I might eb doing wrong?

#

I have the board set to "arduino pro or pro mini"

#

its a 5v pro mini

hidden oracle Jan 11, 2020, 1:14 AM

#

i am getting desperate ... when I have a look at the trinket m0 shop page there is said:
True analog output on one I/O pin - can be used to play 10-bit quality audio clips in Arduino (CircuitPython does not have storage for audio clips)
But I cannot find any example on how to play a #%&$§! audio clip 😢

mighty vigil Jan 11, 2020, 1:25 AM

#

I suggest looking at https://learn.adafruit.com/trinket-audio-player/overview.

With some code modification I'd imagine it'd be possible to use the Trinket's DAC instead of the PWM + RC network.

hidden oracle Jan 11, 2020, 1:39 AM

#

@mighty vigil : Thank you for the link, but the TrinketPlayer sketch example is quite... difficult to understand...

#

And I think the infrastructure of the SAMD21 is quite different compared to the ATmega structure of a standard arduino

north stream Jan 11, 2020, 2:04 AM

#

You'll probably have to graft the "read an audio clip" code onto the "output samples at this rate" code.

hidden oracle Jan 11, 2020, 2:12 AM

#

Yes, that's the difficult part... I really dont understand the useage of timers here...

// Timer resolution is limited to either 0.125 or 1.0 uS,
// so it's rare that the playback rate will precisely match
// the data, but the difference is usually imperceptible.
TCCR0A = _BV(WGM01) | _BV(WGM00); // Mode 7 (fast PWM)
if(sample_rate >= 31250) {
TCCR0B = _BV(WGM02) | _BV(CS00); // 1:1 prescale
OCR0A = ((F_CPU + (sample_rate / 2)) / sample_rate) - 1;
} else { // Good down to about 3900 Hz
TCCR0B = _BV(WGM02) | _BV(CS01); // 1:8 prescale
OCR0A = (((F_CPU / 8L) + (sample_rate / 2)) / sample_rate) - 1;
}
TIMSK = _BV(OCIE0A); // Enable compare match, disable overflow
}*

Is the 'output' part. Due the incompatible example (its for a non M0 / M4 arduino) i got other frequencies and timers and I will have to adopt it...

I will go to bed now. Tomorrow I will try a simple example by looping through the wav raw data by hand and see how long I need to pasue-and-hold for audio playback. Due the fact that I just want to to an action before the playback and then just play a sound I can simply run the code in the main loop with delays. maybe this is the easiest option

north stream Jan 11, 2020, 3:55 AM

#

There's a wrapped version in some later code I wrote, where you just call setperiodic() with a pointer to a boolean, and whenever the boolean is set, it's time to output the next sample

#

https://gitlab.com/bodger/m4-clocked-dac/blob/master/hershey/hershey.ino#L132

GitLab

hershey/hershey.ino · master · John Rehwinkel / m4-clocked-dac

GitLab.com

#

That code and the periodic routine itself live here: https://gitlab.com/bodger/m4-clocked-dac/tree/master/hershey

GitLab

hershey · master · John Rehwinkel / m4-clocked-dac

GitLab.com

dense kiln Jan 11, 2020, 3:03 PM

#

How do I implement a line following algorithm in a line following robot? I have either 3 or 4 sensors (not sure if the fourth gives any advantage).
I have no idea how to translate the individual sensor readouts (1 or 0) into something a PID algorithm can make sense of

#

I've read some posts and did a few searches but I still don't quite understand

north stream Jan 11, 2020, 3:36 PM

#

If the left-hand sensor activates, turn left. If the right hand sensor activates, turn right. If the center sensor activates, continue. If no sensors activate, stop, you're off course.

dense kiln Jan 11, 2020, 3:47 PM

#

I understand that, but that would make the robot never move in a complete straight line and make too many adjustments, going slowly (this is for a competition). I read about PID and that it would fix that problem, but I don't know how to use it with this use case

#

@north stream

surreal pawn Jan 11, 2020, 4:34 PM

#

@hidden oracle the zerotimer library has a example that sends audio samples to the DAC for m0 or m4 adafruit boards

#

https://github.com/adafruit/Adafruit_ZeroTimer/blob/master/examples/timers_callback/timers_callback.ino

GitHub

adafruit/Adafruit_ZeroTimer

happy wrappers for TC modules 3,4,5 on SAMD21. Contribute to adafruit/Adafruit_ZeroTimer development by creating an account on GitHub.

#

a more simple example, this does a blocking sound playback that's the mario coin pickup sound. the sound samples live in audio.h https://github.com/adafruit/Adafruit_Arcada/tree/master/examples/full_board_tests/hallowingm0_arcadatest

GitHub

adafruit/Adafruit_Arcada

Gaming library. Contribute to adafruit/Adafruit_Arcada development by creating an account on GitHub.

#

That example can probably be modified to not use the Arcada library for the sound

hidden oracle Jan 11, 2020, 4:54 PM

#

@north stream @surreal pawn
Thank you both, I will have a look at it when I am at home!

surreal pawn Jan 11, 2020, 4:56 PM

#

if the arcada library works the wavplayer sample should be easiest

dense kiln Jan 11, 2020, 5:00 PM

#

I'll rephrase my question I guess...
What is the correct way to implement PID in a line follower robot with 3 IR sensors and 2 motors?

hidden oracle Jan 11, 2020, 5:09 PM

#

Do you have discrete Motors to drive or servos? The system is an "I" shaped black line and some (white) paper around? The System has a velocity to dirve forward, but you steer the robot by left/right speed? so the steering vektor has to be defined by a speed difference in bith servos. you have to control the steering vector by an PID controler, which has obiously only a 2 - status input (0% = black line, 100% = white paper or vice versa). So the impact of a jump (0 -> 100% or 100% -> 0) shall control this? That's pretty tough for a PID controler

hidden oracle Jan 11, 2020, 5:49 PM

#

@surreal pawn : I tried to load the wavplayer example, unfortunately it fails to compile the example.:
'Adafruit_Arcada' does not name a type; did you mean 'Adafruit_SPITFT'?

hidden oracle Jan 11, 2020, 6:08 PM

#

Is there a way to access the circuit python flash (where I put a WAV file) from arduino? Then i could use other libraries which plays WAV files from Flash / SD

mild elk Jan 11, 2020, 7:21 PM

#

Does Arduino clock speed affect SPI frequency?

swift widget Jan 11, 2020, 7:22 PM

#

@sinful saffron Thanks. You did RS485. We want to do TCP. The Arduino Modbus library is decent but 1) is too big for an Uno, so we need another board, and 2) don’t seem to work for nonArduino boards (Adafruit, TinyPICO). In any case, we’ll be putting something together in next few weeks. Will post here if we succeed! Thanks again.

sinful saffron Jan 11, 2020, 7:24 PM

#

I believe they have converters from RS485 to TCP

#

or perhaps another sheild

#

haven't used these before but it looks like it might have what you want https://store.arduino.cc/usa/m-duino-plc-arduino-ethernet-21-i-os-analog-digital-plus

M-DUINO PLC Arduino Ethernet 21 I/Os Analog/Digital PLUS

Modular PLC
This is the first equipment based on the Arduino technology designed for a professional use. This PLC has 21I/Os. It also contains several communication ports which provide more flexibility and control. The M-DUINO family offers the possibili

#

https://www.arduino.cc/en/ArduinoModbus/ArduinoModbus

Arduino - ArduinoModbus

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

rocky igloo Jan 11, 2020, 7:45 PM

#

@mild elk Yes, if you look in packages/arduino/hardware/avr/1.8.1/libraries/SPI/src/SPI.h the speed is set as a clock divider from F_CPU.

mild elk Jan 11, 2020, 7:45 PM

#

Ok, thanks

hidden oracle Jan 11, 2020, 8:40 PM

#

YEAAAAAAAAAAAAAAHHHHHHHHHHH - it works! 😄

#

thank you @surreal pawn and @north stream !

#

I loaded the ZeroTimer Library and adapted it till it worked!

mild elk Jan 11, 2020, 9:36 PM

#

I'm trying to build an EEPROM programmer, and it almost works, except that when I write something, it writes correctly, but there is something else written one byte higher that I clearly didn't order to be written. Any ideas why is that?

hidden oracle Jan 11, 2020, 9:40 PM

#

📎 VID_20200111_223818.mp4

rocky igloo Jan 11, 2020, 11:17 PM

#

@mild elk What device/interface? I had something like that with an I2C EEPROM chip once and I don't remember the details exactly. It was something like the chip was small and used a one-byte address and I was writing two bytes as if it was larger, and my second address byte was being written as data. It wrote one extra byte and everything was off by one. Maybe food for thought at least...

mild elk Jan 11, 2020, 11:20 PM

#

This is for 28C64/256
Data lines controller with 2x 74HC595 wired to SPI pins. I checked my code and it seems like everything is correct. Data isn't even offset, it's just that the next byte is always written with some semi-random value.

#

@rocky igloo

#

I can post my code, but make sure to ping me since I'm going to sleep now

rocky igloo Jan 11, 2020, 11:29 PM

#

@mild elk Yeah, I don't know that chip so I'm not sure I can help much but I can try. Could be an electrical glitch causing an extra toggle of the ^CE or ^WE lines, or an off-by-one loop error. Sleeping on it is good sometimes.

granite orchid Jan 12, 2020, 12:05 AM

#

Hello hello

#

I have trouble getting the readings from ADXL345 from uno

#

I'm using serial monitor for the outputs

#

The setup is uno+groove shield+adxl345

#

Where should I begin looking into?

📎 unknown.png

rocky igloo Jan 12, 2020, 12:45 AM

#

@granite orchid Would that be a Grove shield, and which one if so? Are you working from a guide for using that device? I'm pretty sure it needs to be plugged into an I2C-type connector, so that's one thing to double-check.

granite orchid Jan 12, 2020, 12:51 AM

#

@rocky igloo groove shield yeah, connected to I2C. Solved; faulty sensors. Thanks though!

pine bramble Jan 12, 2020, 3:04 AM

#

i'm trying to think how to have an array of outputs that i can change from being all my outputs (int 1-5) or one or more combinations of them to loop over. what should i google

#

or should i even use array

cedar mountain Jan 12, 2020, 3:07 AM

#

You might consider a bitmask, if I understand the question correctly.

pine bramble Jan 12, 2020, 3:11 AM

#

i just want to be able to change what outputs i'm writing to dynamically

north stream Jan 12, 2020, 3:12 AM

#

You can either call pinMode on the ones you want to update, or modify the data direction register for that port (which is what I think EdKeyes is getting at)

vast cosmos Jan 12, 2020, 5:50 AM

#

i ordered last week this nifty STM32 discovery board: https://www.st.com/en/evaluation-tools/b-g474e-dpow1.html

#

its designed for digital power management, has an integrated buck-boost converter and a USB-C connector for USB PD, which can be used as input to the buck-boost converter

#

apparently that "RGB power LED" mounted on top has a diffuser that is physically dangerous to the eyes to look at from any distance

#

removing the diffuser is guaranteed permanent blindness i guess

#

sounds exciting

#

its warnings like that which always get me in trouble. if they didnt put the warnings on there i wouldnt be tempted to trick a loved one into sacrificing their corneas for my amusement

#

it also has an integrated function generator

fluid wagon Jan 12, 2020, 8:43 AM

#

The future's so bright, you gotta wear shades...

mild elk Jan 12, 2020, 10:42 AM

#

@rocky igloo 28C64 is 8KB parallel EEPROM. I have CE tied low, and WE only pulsed low when write occures. I don't think it's a connection error, because it writer and reads properly

mild elk Jan 12, 2020, 12:19 PM

#

This might have been some weird issue with my code. I rewrote it and it seems to work fine now.

bright nest Jan 12, 2020, 11:42 PM

#

can someone help me understand how to program the 16 channel servo controller? i dont understand how pwm works...

#

im using the arduino library btw

surreal pawn Jan 13, 2020, 12:23 AM

#

what are you trying to do?

#

this? https://www.adafruit.com/product/1411

Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface

You want to make a cool Arduino robot, maybe a hexapod walker, or maybe just a piece of art with a lot of moving parts. Or maybe you want to drive a lot of LEDs with precise PWM output. Then ...

#

https://learn.adafruit.com/adafruit-16-channel-pwm-slash-servo-shield

Adafruit Learning System

Adafruit 16-channel PWM/Servo Shield

16 channels of servo-bustin' power

bright nest Jan 13, 2020, 1:06 AM

#

the 16 channel one

#

sorry i had my notifications off

north stream Jan 13, 2020, 2:19 AM

#

The library comes with some helpful examples

weary timber Jan 13, 2020, 1:35 PM

#

hello

#

I have an OLED, connected to arduino

#

but it cant write letters like ç ö ğ or degree symbol

#

in there a font for that

north stream Jan 13, 2020, 1:41 PM

#

Are you using AdaFruit GFX or some other library to write to it? There are probably some fonts with those symbols, or there's this article on how to add custom characters https://learn.adafruit.com/creating-custom-symbol-font-for-adafruit-gfx-library

weary timber Jan 13, 2020, 2:30 PM

#

I have adafruit gfx

winged hedge Jan 13, 2020, 2:42 PM

#

📎 IMG_20200113_201218820.jpg

#

how to connect this display with arduino???

north stream Jan 13, 2020, 3:38 PM

#

That's an oddball. Four power supply pins plus the LED backlight? I suspect it's a serial interface, so WR and CS probably have to be at a particular level, then asynchronous serial data gets sent to the DATA pin.

winged hedge Jan 13, 2020, 6:10 PM

#

@north stream is there any adafruit library for this ??

north stream Jan 13, 2020, 6:18 PM

#

I don't know. Do you what the part number or controller chip is?

winged hedge Jan 13, 2020, 6:26 PM

#

@north stream that will be fine , i can read from datasheet

vast cosmos Jan 13, 2020, 7:19 PM

#

does anyone have an nRF52840-based board AND one of those cheap ILI9341 TFT screens they can test something for me?

#

i only have an Arduino Nano BLE Sense, but im planning on getting an ItsyBitsy nRF52840. but i may think twice if this issue im seeing exists on the itsybitsy as well

#

basically, just run the "graphics-test" example sketch from Adafruit_ILI9341. you would think the nRF52, being a cortex M4, would be able to run this sketch at least as fast as a SAMD51 cortex M4, and a SAMD21 cortex M0, but it is instead running insanely slower than all of them

#

using Adafruit_ILI9341 on any nRF52840-based board takes roughly 4 seconds to fill the screen with a solid color

#

surely that cant be right

safe shell Jan 13, 2020, 8:02 PM

#

Clock speed is lower, for one thing (64MHz for nRF vs. 120MHz SAMD51, although SAMD21 is only 48MHz). SPI default speeds vary by chip, but I don't see any of these explicitly, so should all be using the failover 24MHz? https://github.com/adafruit/Adafruit_ILI9341/blob/master/Adafruit_ILI9341.cpp

GitHub

adafruit/Adafruit_ILI9341

Library for Adafruit ILI9341 displays. Contribute to adafruit/Adafruit_ILI9341 development by creating an account on GitHub.

vast cosmos Jan 13, 2020, 9:48 PM

#

ive tried changing SPI clock speed to 8, 16, 24, and 32MHz, and I can verify it is being set correctly at SPI.beginTransmission()

#

but it doesn't ever affect the actual poor performance im experiencing

#

(it doesnt improve OR degrade performance)

#

i was hoping someone else could verify it, possibly with a different board

#

i have an Excamera Labs SPIDriver i can hook up for debugging later, but it would still be useful to have confirmation from someone else

stable forge Jan 14, 2020, 1:03 AM

#

@vast cosmos The nRF52840 supports SPI >8MHz only on the SPIM3 peripheral, which is buggy (though there are tricky workarounds), and so I'm not sure if Arduino is supporting SPIM3. Also if you're using the Arduino BSP for that board, it's using Mbed, and I don't know about its SPI performance.

vast cosmos Jan 14, 2020, 1:22 AM

#

@@stable forge thanks, I'll have to see if all of SPI3s pins are even available on this board. Any idea if they are on the Itsybitsy?

stable forge Jan 14, 2020, 1:23 AM

#

The nRF chips are quite flexible, and you can assign most pins to any peripheral. I'm confused: all you have in hand is an Arduino Nano 33 BLE right now, or do you have an ItsyBitsy?

#

our nRF Arduino does have support for SPIM3: https://github.com/adafruit/Adafruit_nRF52_Arduino/pull/360

vast cosmos Jan 14, 2020, 1:25 AM

#

All I have is a nano 33 BLE, but it is only a placeholder until I can get a (cheaper) itsybitsy

#

My final project won't have any use for the Nano 33 BLE sense's plethora of sensors, so I dont want to commit to using it. The Itsybitsy is a better fit

stable forge Jan 14, 2020, 1:27 AM

#

i'm looking at the arduino BSP for their board right now to see if there's SPIM3 support

#

@vast cosmos ok, it looks to me like the mbed support doesn't include SPIM3 support

#

so you're limited to 8MHz

vast cosmos Jan 14, 2020, 2:24 AM

#

I guess I don't understand where Mbed exists if the adafruit nRF52 bsp doesn't depend on it

#

Is it infeasible to attempt using Adafruit_nRF52_Arduino with a nano BLE?

#

So are the named SPI pins on the Itsybitsy assigned to the SPIM peripheral by default? And its clock prescalar set to something greater than 8MHz by default

fluid wagon Jan 14, 2020, 2:44 AM

#

I would imagine that depends on how close the board definitions are.

#

When using arduino as the toolchain, a LOT of hardware decisions have already been made, even with the original Uno. Adafruit, and Arduino , have made some different decisions when using the nRF chips.

#

Which pins are assigned to what, which pins get broken out for our use, clock speeds, etc. All have been decided before we start working with the board.

vast cosmos Jan 14, 2020, 2:49 AM

#

Right, but a lot of that can be easily changed in the respective variant board definition, like the mode and peripheral assignment of pins

fluid wagon Jan 14, 2020, 2:49 AM

#

Yes, some of it can. Some of it cannot though. Clock speeds are usually one of those things. It all depends on what the vendor tied to the xtal pins.

#

That is a "semi" hardware decision. Sure, you can unsolder a crystal and replace, or change the fuses to tell it to use the internal oscillator, but, it isn't "trivial"

#

Then, when you change the speed of things, libraries need to be adjusted

#

since they are written on the "base assumptions" of the board in question

#

Changing the clock can have dramatic results with some libs, Servo springs to mind.

vast cosmos Jan 14, 2020, 2:56 AM

#

So what exactly is the purpose or role of Mbed in the standard Arduino tool chain?

fluid wagon Jan 14, 2020, 2:56 AM

#

I honestly don't know why they chose the mbed toolchain for that particular board.

#

If I am not mistaken, the MCU is a Arm Cortex M4F

#

Why they didnt go with the same toolchain as the other Cortex board probably has something to do with the vendor

vast cosmos Jan 14, 2020, 2:57 AM

#

It is a separate toolcahin? It isn't just like a hardware abstraction library?

fluid wagon Jan 14, 2020, 2:58 AM

#

It is some of both?

#

I havent used it personally

#

I just know it exists

#

https://www.mbed.com/en/

Arm Mbed

Home | Mbed

The Arm® Mbed™ IoT Device Platform provides the operating system, cloud services, tools and developer ecosystem to make the creation and deployment of commercial, standards-based IoT solutions possible at scale.

vast cosmos Jan 14, 2020, 2:58 AM

#

The MCU, Nordic nRF52840, is a Cortex M4 yeah

fluid wagon Jan 14, 2020, 2:58 AM

#

I think it is something like atmels ASF and such

#

That is the page for mbed 😉

vast cosmos Jan 14, 2020, 2:59 AM

#

Hah thanks so much

fluid wagon Jan 14, 2020, 2:59 AM

#

Well, I dont know enough to answer ALL of your questions

#

but I can point ya in the right direction

vast cosmos Jan 14, 2020, 3:00 AM

#

You're dead to me

fluid wagon Jan 14, 2020, 3:01 AM

#

Wouldn't be the first time I've heard that before...

#

What I DO know, owning a ble sense myself, is that the toolchain is dog slow to compile 😛

vast cosmos Jan 14, 2020, 5:31 PM

#

@fluid wagon well speak of the devil, the ItsyBitsy nRF52840 is back in stock if youre interested

#

https://www.adafruit.com/product/4481

Adafruit ItsyBitsy nRF52840 Express - Bluetooth LE

What's smaller than a Feather but larger than a Trinket? It's an Adafruit ItsyBitsy nRF52840 Express featuring the Nordic nRF52840 Bluetooth LE processor! Teensy & powerful, ...

fluid wagon Jan 14, 2020, 5:32 PM

#

I am not, I have a couple of adafruit's BLE shields for my metro m4s 😉

#

And a ble sense

#

Thank you though

#

Did you ever figure out the difference between mbed and the straight gcc toolchain the adafruit stuff uses?

vast cosmos Jan 14, 2020, 5:34 PM

#

nope, i was sitting in bed doing actual "work" work last night, havent yet had a chance to do any fun work

fluid wagon Jan 14, 2020, 5:35 PM

#

Fair enough

#

I'd be curious to know, I know many people do RTOS systems on the Arm processors, I figured that mbed was something similar

#

is neither cool nor knowledgeable enough to do such things yet.

north stream Jan 14, 2020, 5:39 PM

#

I did RTOS on ARM long ago (back in the 1900s) with VRTX.

fluid wagon Jan 14, 2020, 5:40 PM

#

Well, @vast cosmos and I were trying to figure out why Arduino went for the mbed toolchain for their Nano 33 BLE boards

cedar mountain Jan 14, 2020, 5:40 PM

#

I've used FreeRTOS a lot on Cortex chips.

fluid wagon Jan 14, 2020, 5:40 PM

#

I don't know nearly enough about mbed to know the pros/cons

vast cosmos Jan 14, 2020, 5:40 PM

#

yeah I use FreeRTOS on STM32 chips all the time

fluid wagon Jan 14, 2020, 5:40 PM

#

What I do know is it takes FOREVER to compile 😉

north stream Jan 14, 2020, 5:41 PM

#

I assume they did so because it was modular and similar enough to their existing toolchain to be fairly easy to integrate with their application.

vast cosmos Jan 14, 2020, 5:41 PM

#

@fluid wagon i think the speediness of your compile is more related to the Arduino-Builder than the Mbed toolchain itself

#

in particular, its poor cache awareness

#

i.e. your Mbed core is being recompiled -every time-

fluid wagon Jan 14, 2020, 5:44 PM

#

I mean, its not a huge deal, but it does take significantly longer to compile even blink.ino on it compared to anything else I've played with so far

vast cosmos Jan 14, 2020, 5:44 PM

#

i know it sounds far-fetched, although it worked for me, but try getting either a beta build (v1.9) or one of their nightly builds. the newest version tends to use cached objects a lot more aggressively

fluid wagon Jan 14, 2020, 5:44 PM

#

I believe you, just pointing out my observation. I'll look forward to the improvements in 1.9 🙂

vast cosmos Jan 14, 2020, 5:44 PM

#

@north stream lol @ "the 1900s"

fluid wagon Jan 14, 2020, 5:45 PM

#

I would be very curious to hear why they went that route though.

#

Is the SAMD tools restricted to only SAMD mcus? are they not "generic" enough to do the nRF chips?

#

Is there some advantage?

#

(I have a habit of asking questions well beyond my skills, as hearing the answers is often beneficial in learning to understand things.)

vast cosmos Jan 14, 2020, 5:48 PM

#

just throwing out my naive understanding -- i thought Mbed was only a spec, so that BSPs could be developed that adhere to the Mbed spec, and can abstract away the actual hardware slightly

#

but the way @stable forge was referring to it last night, it sounded more like an actual software suite

fluid wagon Jan 14, 2020, 5:49 PM

#

Like I said the other night, I am not exactly sure what mbed is.

#

I was getting the impression from what little I poked at trying to understand it, that it was an entire toolchain. like using IAR or Kelli (spelling) or what have you.

stable forge Jan 14, 2020, 5:54 PM

#

The board support package for Nano 33 BLE uses Mbed at the lower levels. I'd call it an SDK. The Arduino libraries are implemented in the SDK API. I assume they did this because the BLE support needs some kind of RTOS or self-contained library to handle BLE interrupt servicing, etc. We use the Nordic SoftDevice directly. It's not clear to me whether Mbed uses it too, but if they do, it appears to be at a different position in flash

The BSP includes the toolchain too.

#

Is the SAMD tools restricted to only SAMD mcus? are they not "generic" enough to do the nRF chips?

The M4 architecture is the same on both chips, but how you work with the peripherals (SPI, I2C, radio, etc.) is completely different. That's the "value added" for each manufacturer and the lock-in.

#

only the core CPU architecture is the same

vast cosmos Jan 14, 2020, 5:56 PM

#

so if you use the softdevice directly, do you too not also need some notion of an RTOS or ISR manager?

stable forge Jan 14, 2020, 5:56 PM

#

the softdevice handles that; it does scheduling of things that would interfere with the BLE timing requirements, and some things we'd do directly are done instead by calling the softdevice API.

vast cosmos Jan 14, 2020, 5:58 PM

#

so there is Nordic library code integrated inside of the Adafruit_nRF52_Arduino core

stable forge Jan 14, 2020, 5:59 PM

#

yes, we use the nrfx library, which is simple drivers, and we use the softdevice. We use essentially nothing from the rest of the Nordic SDK, like the "peer manager" (pairing and bonding), etc.. the SDK used to have a more restrictive license than it does now.

vast cosmos Jan 14, 2020, 6:00 PM

#

thank you so much for your input @stable forge, it helps a ton

stable forge Jan 14, 2020, 6:01 PM

#

Nordic has started to use the Zephyr RTOS on newer products, and appears to be moving away from less general-purpose SoftDevice concept.

fluid wagon Jan 14, 2020, 6:01 PM

#

And as always, very informative

weary timber Jan 14, 2020, 6:09 PM

#

hello

#

I am using adafruit oled with sd card

#

but it doesnt notice both

#

and I cant use them

fluid wagon Jan 14, 2020, 6:15 PM

#

Did you check your wiring?

#

And make sure you are using different CS pins for each device?

upper rune Jan 14, 2020, 7:38 PM

#

I am trying to upload a sketch to an arduino pro mini but i keep on getting this error avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x4c
Nothing else connected to the board

rocky igloo Jan 14, 2020, 7:49 PM

#

@upper rune What kind of USB-to-serial adapter are you using to connect it to your computer? And what operating system?

#

Also there are both 3.3 volt and 5 volt versions of the Pro Mini. Does your USB adapter match your board, or have a switch for signal level?

north stream Jan 14, 2020, 8:00 PM

#

Also make sure the adapter is installed the right way around and you're using the right serial port.

rocky igloo Jan 14, 2020, 8:04 PM

#

😁 I love me some Pro Minis but having to figure out which way the adapter goes is a pain every time.

north stream Jan 14, 2020, 8:16 PM

#

blk/GND to blk and grn/DTR TO grn. I have to look every single time too.

upper rune Jan 14, 2020, 8:23 PM

#

The pro mini I got is 3.3v

📎 image0.jpg

rocky igloo Jan 14, 2020, 8:28 PM

#

I don't see anything wrong there. Is the USB serial device appearing on your computer, COMx: or /dev/ttyUSBn or whatever?

upper rune Jan 14, 2020, 8:28 PM

#

yea, it shows up as com4 in the arduino ide

#

im using windows btw and this is the settings ive setup:

📎 unknown.png

rocky igloo Jan 14, 2020, 8:31 PM

#

Do you see LED activity on the boards when you try to write a sketch? There's a pretty good light show if anything's getting through.

vast cosmos Jan 14, 2020, 8:32 PM

#

it looks like you have your Rx lines tied together and your Tx lines tied together

#

oh wait, those arent connected to each other are they? disregard me

upper rune Jan 14, 2020, 8:33 PM

#

well, 1 LED is on constantly and another is blinking at a constant rate, i dont see any change tho when i try to write

vast cosmos Jan 14, 2020, 8:34 PM

#

do you not have to put Pro Minis in bootloader mode before trying to program it?

rocky igloo Jan 14, 2020, 8:36 PM

#

I never have. They're supposed to reset when the serial connection opens, and the bootloader waits a few ticks there before restarting.

#

But it doesn't sound like anything's getting through to the USB-serial adapter.

#

(Specifically, DTR is tied to the Reset pin, so the bootloader is activated when DTR goes low.)

#

@upper rune You might narrow it down by disconnecting all the jumpers from the USB-serial adapter, then connecting RXD to TXD on the adapter. Open the Arduino Serial Monitor and enter some lines of text and see if it echoes back.

#

@vast cosmos @north stream Please check me on this, but I just did it with one of my FTDI boards and it looped back ok and the LEDs on the board flashed.

upper rune Jan 14, 2020, 8:57 PM

#

i tried what you said and i got no echo

north stream Jan 14, 2020, 8:57 PM

#

Does that Pro Mini really have 2 ground pins on the programming connector? It might be worth trying moving the ground (black) wire to the end pin (normally the one next to it is CTS).

#

CTS is normally grounded, so it would probably work that way too, just making sure.

upper rune Jan 14, 2020, 9:00 PM

#

i have worked out that the TX pin on the usb adapter works which makes me think that the rx pin is somehow broken

rocky igloo Jan 14, 2020, 9:02 PM

#

@upper rune Yes, it sounds like it. I wish it had been something we could talk you through, but a replacement adapter is probably what you need.

upper rune Jan 14, 2020, 9:03 PM

#

ok

rocky igloo Jan 14, 2020, 9:05 PM

#

@north stream Both are labeled "GND" in the gen-u-wine schematic. And at least on my (clone) boards there's one ambiguously placed silkscreen label apparently intended to apply to both pins. https://www.arduino.cc/en/uploads/Main/Arduino-Pro-Mini-schematic.pdf

north stream Jan 14, 2020, 9:12 PM

#

I now see that a simple loopback test didn't work, which implies a problem with the USB-serial converter itself

mighty vigil Jan 15, 2020, 12:46 AM

#

I'm programming an ATTINY85 with Arduino IDE and I need a small SD card library (read-only). Any suggestions?

pine bramble Jan 15, 2020, 12:58 AM

#

without a link to both datasheets it'd just be a wild guess.
My thought went to the Adafruit SPI FRAM as a functional substitute .. off-chip solutions are what comes to mind.

#

https://forum.arduino.cc/index.php?topic=121753.0

drifting shore Jan 15, 2020, 1:08 AM

#

i'm making a binary counter

#

and i have a while loop that won't stop

#

while(round(curNum / 2) != 0 || round(curNum / 2) != 1){
    Serial.println(curNum / 2);
    Serial.println(number);
    curNum = round(curNum / 2);
    place--;
  }```

#

number = 0;

#

curNum = number;

#

there aren't any projected errors

rocky igloo Jan 15, 2020, 1:43 AM

#

@drifting shore if round(curNum / 2) != 0 fails, it's equal to 0 and therefore not equal to 1, and vice versa. The while test condition will always be true. Do you want && instead?

narrow thorn Jan 15, 2020, 3:09 AM

#

for CPX you use this in arduino..

#

#include <Adafruit_CircuitPlayground.h>
#include <Adafruit_Circuit_Playground.h>

#

what do you use for a CPXBLE?

pine bramble Jan 15, 2020, 5:09 AM

#

~/arduino-1.8.10/libraries/Adafruit_Circuit_Playground

#

That's where that was.

#

I don't know of anything else, offhand, that lives there.

#

The Guide reads like a page is missing. It just goes right into 'switches' without giving any context about that include file.

#

There's no proper lead-in sentence to this:
https://learn.adafruit.com/adafruit-circuit-playground-express/arduino-switches

#

🔻
https://github.com/adafruit/Adafruit_CircuitPlayground

#

Seems to get installed all by itself with no help from Human.

#

@narrow thorn Do the same.
The smoking gun:
https://github.com/adafruit/Adafruit_CircuitPlayground/blob/master/utility/Adafruit_CPlay_Mic.cpp#L25

#

We forgot to tell you we didn't throw you under the bus. ;)

#

That's what it should say.

#

The new release of that repository also mentions the bluefruit by name:

https://github.com/adafruit/Adafruit_CircuitPlayground/releases/tag/1.10.4

swift widget Jan 15, 2020, 2:34 PM

#

I was testing whether my Arduino Modbus example code (with wifi changed for Ethernet) would compile for different boards (it runs fine on an Uno with Ethernet shield) as I could not get it to compile for any Adafruit board. Oddly, I noticed that it would compile for Circuit Playground Express listed under Ardiuno M0 boards but not the Circuit Playground Express under the Adafruit M0 boards.

Below is the error I get when the board doesn’t compile the code. Any idea why the weird compile problems? What might be the board definitions or compiler differences causing this? Is this fixable?

[I removed long path]/Arduino/libraries/ArduinoModbus/src/libmodbus/modbus-tcp.cpp:32:21: error: expected unqualified-id before '{' token #define printf(...) {} ^ [I removed long path]/Arduino15/packages/adafruit/hardware/samd/1.5.9/cores/arduino/Print.h:88:10: note: in expansion of macro 'printf' void printf(const char[], ...); ^~~~~~

Please @ me so I don’t miss your reply. Thank you.

north stream Jan 15, 2020, 2:47 PM

#

@swift widget Looks like the code is both defining printf() as a function and trying to use the preprocessor to replace it with {}. Normally such things are arranged so the preprocessor does one or the other. The easiest fix might be to wrap the printf() code in #ifndef printf so it only attempts to provide the code if it's not replaced.

#

Otherwise, the preprocessor will replace the declaration with ```c
void {}(const char[], ...);

swift widget Jan 15, 2020, 5:25 PM

#

@north stream Dang. It was an #ifndef for debugging that was tied to ARDUINO that I didn't understand until you explained this. Makes perfect sense. Thank you. I commented it out in the source and now all is good! <rubs hands with glee> [BTW, if there were karma points, I'd give you one, as would have all the others I see you help so much around here]

pine bramble Jan 15, 2020, 5:27 PM

#

karma implies storing value for later analysis .. but stored where, exactly

swift widget Jan 15, 2020, 5:30 PM

#

@pine bramble haha. I think the gods store all our Karma now on AWS servers, because The Cloud

pine bramble Jan 15, 2020, 5:31 PM

#

karma's just leftover cultural foo from the 1960's .. imported from a less-informed culture. ;)

#

https://www.youtube.com/watch?v=GmrvH3PYnEc or it could be bunny rabbits, instead (remnants of my offtopic foo)

north stream Jan 15, 2020, 6:02 PM

#

AWS would make sense, as Karma is (like AWS) pretty unreliable

primal cargo Jan 16, 2020, 4:35 AM

#

is there anyone that can help me with some arduino code? I'm trying to delay an output when a input is switched on and held, then when released I want the output to release at the same time. I want to add this to some other code so it has to use millis for timing not delay.

#

this is where I am struggling.

safe shell Jan 16, 2020, 5:44 AM

#

@primal cargo It might help to post the code. Are you using interrupts or polling (and are you looking at levels or transitions)?

primal cargo Jan 16, 2020, 5:48 AM

#

I modified the debounce code.

#

how can i post the code?

safe shell Jan 16, 2020, 5:49 AM

#

just cut-and-paste the relevant section(s), it's easier to read if you put three backticks before and after the code (see: https://support.discordapp.com/hc/en-us/articles/210298617-Markdown-Text-101-Chat-Formatting-Bold-Italic-Underline-) ...or if it's too long, post a file, or upload the code somewhere and post a link

Discord

Markdown Text 101 (Chat Formatting: Bold, Italic, Underline)

Want to inject some flavor into your everyday text chat? You're in luck! Discord uses Markdown, a simple plain text formatting system that'll help you make your sentences stand out. Here's how to d...

primal cargo Jan 16, 2020, 5:52 AM

#

    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is LOW
      if (buttonState == LOW) {
        ledState = HIGH;
      }else{
        ledState = LOW;```

#

I tried to make a delay and the only way I could seem to figure it out was to increase the debounce delay to the .5sec delay that I needed but then when I release the switch theres a delay in turning the output off also.

#

unsigned long debounceDelay = 500;  ```

#

Can I just upload the ino file?

📎 Delay1.ino

safe shell Jan 16, 2020, 6:00 AM

#

Are you wanting to light the LED for the entire duration of a (debounced) extended press, or wait until the button is realeased before lighting the LED?

primal cargo Jan 16, 2020, 6:01 AM

#

I want it to be lit the entire time, it just needs to delay .5 sec after the switch is turned on.

safe shell Jan 16, 2020, 6:05 AM

#

The debounce delay is too long. When it was 50ms, what was happening (or not happening) that was different than what you wanted?

primal cargo Jan 16, 2020, 6:05 AM

#

There was no delay when I turned the switch on. the led will turn on and off at the same time.

#

changing the debounce delay was the only way I got it to delay when I turned on the switch but then it also delays the led from turning off when I turn the switch off.

safe shell Jan 16, 2020, 6:09 AM

#

What's the hardware... is the switch momentary or latched?

primal cargo Jan 16, 2020, 6:09 AM

#

latching switch.

#

im trying to bypass a momentary button that can only be pressed and needs to be held down after a switch is turned on.

safe shell Jan 16, 2020, 6:17 AM

#

You want the LED to stay on as long as the switch is in the on position, and same for off, right? But you want .5s delayed action on the LED relative to the switch? Sorry, it's late and I'm not sure I'm completely following

primal cargo Jan 16, 2020, 6:19 AM

#

thats correct. switch turns on .5 second delay led on, switch off led off.

#

but it needs to use millis for timing vs delay.

safe shell Jan 16, 2020, 6:20 AM

#

right, OK, so I think you just need to mark a new duration with a new variable that tracks that 0.5s delay after debounce has settled (but only for the On, and not the Off?)

primal cargo Jan 16, 2020, 6:21 AM

#

yes On only.

#

so add another variable like this.

#

unsigned long waittimeto_override = 500;

safe shell Jan 16, 2020, 6:25 AM

#

Right, then track a duration after switching on, and turn the LED On after the waittimeto_override is exceeded. But unless you have interrupts elsewhere, the code runs sequentially and you could use a delay before the LED On.

#

But yeah it gets more involved if you want to handle button state changes within that LED delay time too.

primal cargo Jan 16, 2020, 6:29 AM

#

ok, I think I'm going to call it a night I have been messing with this thing most of the day and its late.

#

Thank you

knotty rover Jan 16, 2020, 3:22 PM

#

Anyone here able to clarify ENable pin behavior on the feather. with an switch tied between that and ground, if i leave a device with a battery on it and I turn the switch on, is this accurate:

i can still charge the battery, but the device could be left laying around till i flip the switch, if it isn't plugged in and charging, without dying

north stream Jan 16, 2020, 3:43 PM

#

Yes, the enable pin enables the 3.3V regulator which powers the CPU. When the enable pin is pulled low, the regulator is shut down, and the only current drawn is the quiescent current of the regulator (a few microamps), the current through the enable pull-up resistor (37 microamps), the current through the battery monitor divider (18 microamps), and whatever the CPU draws via its Vbus pin via the battery reverse diode.

primal cargo Jan 16, 2020, 4:27 PM

#

@safe shell I got something working now Thanks again for the help.

#

📎 DelaySwitch2.ino

knotty rover Jan 16, 2020, 4:41 PM

#

@north stream thanks 🙂

#

@north stream and the battery charger still works when its 'off' ?

north stream Jan 16, 2020, 4:44 PM

#

Yes, the battery charger chip is powered from Vbus and directly connected to the battery connector (and pin).

karmic stream Jan 16, 2020, 4:49 PM

#

is anyone working with the stm32f407vg discovery board?

#

if yes, I have a question in regard to pending interrupts/events

#

when I wait for an interrupt with __WFE(), I get the interrupt handler being executed twice, __WFI() only triggers it kind of once.

#

I have cofigured the external irq to trigger events as well as interrupts, but removing the event trigger line does not seem to remove the mentioned behaviour

#


    while(1)
    {
        vectorTable.waitForIRQ();
        Blinking(1, 500);    // toggle twice with 500ms inbetween                
    }

#

the blinking is being triggered twice, when an external interrupt is triggered

knotty rover Jan 16, 2020, 5:02 PM

#

@north stream Thanks 🙂

winged hedge Jan 16, 2020, 5:06 PM

#

i have 5 modbus RS485 slave(uno) and one master(uno)
how i can poll all slave and store in master device memory

help me in this....!!

knotty rover Jan 16, 2020, 5:14 PM

#

anyone have a good tutorial on Feather Bluetooth LE -> Unity bidirectional communication?

#

I have some plugins that explain it using an HC-06 module to and arduino, but i'm not sure about how to make that work with a feather and integrated module

north stream Jan 16, 2020, 6:03 PM

#

@winged hedge Which libraries are you using? Do you mean poll known slaves, or enumerate which slaves are there?

knotty rover Jan 16, 2020, 6:41 PM

#

that one: https://assetstore.unity.com/packages/tools/input-management/arduino-bluetooth-plugin-98960

Arduino Bluetooth Plugin - Asset Store

This plugin now supports BLE GATT characteristics communication for BLE on Android, MacOS, iOS and UWP.

Supports :
iOS : BLE
Android : BLE, BluetoothClassic
MacOS : BLE, BluetoothClassic
Windows PC : Bluetooth Classic, USB Cable
UWP : Bluetooth Classic, BLE
if ...

#

and https://assetstore.unity.com/packages/tools/network/bluetooth-le-for-ios-tvos-and-android-26661

Bluetooth LE for iOS, tvOS and Android - Asset Store

NOTE: If you want bluetooth networking between Android and iOS devices please see our other asset: HERE

This is a very simple implementation of Bluetooth Low Energy (BLE) for iOS, tvOS and Android.

Create a BLE Central Manager to access BLE Peripherals

This asset...

#

i have this too, which has some bluetooth support https://assetstore.unity.com/packages/tools/utilities/serial-port-utility-pro-125863

Serial Port Utility Pro - Asset Store

Powerful Serial port utility in Unity for Android, Linux, Mac OS, and Windows.
This is extended plugin for Unity that gives developers an easy to use powerful computer communication solution. When you use this plugin, you can spend time on important other works.

Website...

#

i'd prefer the 3rd of all of them because i use it for direct serial comm's already

winged hedge Jan 16, 2020, 6:58 PM

#

@north stream using modbusrtu to create slaves
test with with modbus tester working good

installed ModbusMaster library to create master device.
problem i found is if i run modbus tester via usb i can read both on laptop and master arduino uno device
if i disconnect i get 226 error on master arduino device

looks strange

north stream Jan 16, 2020, 7:01 PM

#

I'm not sure what you have USB hooked up to here. 226 is what, a communication error?

winged hedge Jan 16, 2020, 7:05 PM

#

@north stream arduino uno usb cable via that only i am testing slave in laptop

#

@north stream can u suggest good library that can perform read register of 5 slave using single modbus master

#

i tried many only one-one is successful

north stream Jan 16, 2020, 7:07 PM

#

Alas, I don't know much about it. There seems to be a choice of several libraries.

winged hedge Jan 16, 2020, 7:09 PM

#

@north stream fine, thank u

pine bramble Jan 17, 2020, 12:01 AM

#

im having trouble with my samba server

#

i cant connect to is

#

it* it is showing that the samba AD daemon has failed

#

cLeEeEeEeEaAaAaAaAaRrRrRr

surreal pawn Jan 17, 2020, 12:17 AM

#

are you running arduino over samba?

pine bramble Jan 17, 2020, 12:34 AM

#

no im on a raspbery pi

north stream Jan 17, 2020, 1:11 AM

#

I warned you samba was a can of worms.

idle magnet Jan 17, 2020, 5:26 AM

#

What are some implementations of LED "breathing" effect curves that aren't just the example's linear 0-100-0

burnt island Jan 17, 2020, 5:34 AM

#

a simple sine wave would probably look decent

#

maybe with a little clipping to stretch the full-on and full-off times

#

constrain(map(sin(millis() % interval, -1, 1, -20, 275), 0, 255)

north stream Jan 17, 2020, 2:30 PM

#

Someone reverse engineered Apple's "breathing" effect and determined that it was something like a secant.