This is the temperature sensor I’m using
#help-with-arduino
gilded swift
12 bit serial data output over 2 wire i2c
Do you think it’s feasible for the attiny25 to handle?
north stream
Probably. RAM might be more of a limit than flash.
gilded swift
Yeah, that was also something I was thinking about.
I suppose the only way to know for sure is to build it and see
north stream
That's what I'd do: probably faster than trying to figure it out.
covert epoch
is it possible to make webcam using https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwiK5cLe6ZTrAhVUrpYKHbQzDAMYABAGGgJ0bA&ohost=www.google.com&cid=CAESQeD2Keu_UZB8rcsm2NxyPgnDLTOi_SJ0NJzs7MRRG-hw_zpTR37pclDCHcusz2y-zNBDIYkX8_larh0Az8c_WnvV&sig=AOD64_3uvVc4sPAsP4PZ8sIiQg9I81RqHA&ctype=5&q=&ved=2ahUKEwj01LPe6ZTrAhVszjgGHcc4AK8Q9aACegQIDRA9&adurl=
anyone tell please
rotund condor
stuck coral
The answer is sort of. If you need a webcam buy a webcam. The bitrate will be very poor, and the sensor will not be working in the provided working specifications unless you use a SAMD51 based board but will technically take photos and can send that over USB
And the SCCB bus is a pain, some people get it to work over normal i2c but Ive had no joy
narrow jackal
Can I use a MOSFET to switch on and off a power supply?
Would I need relays?
If the max on the MOSFET is 50A and 200V and my power source is 12V 1.5A will it still be compatible
pine bramble
is it safe to connect my arduino directly to a power bank? I heard some power banks turn off after some time from low consumption rates but is it possible that a power banks burns the arduino?
narrow jackal
anything is possible if it supplies too much voltage/current
if it's within 6-12V everything should be good
vast brook
fry
narrow jackal
But if it's like 6V it might output less voltage than usual
pine bramble
its through usb so the voltage should be 5V if im correct
but I still don't wanna test it
dont wanna kill my arduino mega
vivid rock
as long as it is USB, it MUST be 5 V - at most 5.25 - and it is safe to connect to an arduino, no matter what capacity is your powerbank
harsh jackal
Completely new to arduino and just bought Elegoo's uno complete starter kit. I've watched a couple videos from BV3d: Bryan Vines to help me get started with setting up a development environment and getting familiar with each part of the kit. I plan on continuing with his series of videos on arduino, but does anyone have other channels or websites that have a complete class.
north stream
You can use the Mega's on-board regulator to operate safely from higher voltages. Most USB power banks are okay, but cheap ones can zap things
narrow jackal
There's gonna be a voltage regulator it should be a little more
stone dirge
New to Arduino Hello, I have a ESP-01s and am trying to figure it out. I uploaded the Blink example and was able to run it perfectly, but when I do the simple BareMinimum AT test, I am unable to get a response. Any thoughts?
safe shell
some USB battery packs turn off if the current is too low
north stream
That too: there are packs designed not to (they'll run down faster, however)
quartz furnace
@stone dirge Does it give errors in the serial monitor ?
stone dirge
@quartz furnace No. When I AT test it, nothing is returned
Oh btw, I have the monitor set at "Both NW & CR" and 115200 Baud
narrow jackal
Can FauxmoESP only be used for simple voice commands?
as in "turn device on" or "turn device off"
If I were to make an Alexa skill, would I still be able to use FauxmoESP?
quartz furnace
@stone dirge hmmm how about a simple Serial Print Sketch .. does it print to the Serial Monitor ?
stone dirge
So I tried the "Hello World" example from a booklet that came with a learning kit I bought. It didn't work, but I think I didn't write the code correctly (I likely didn't account for different conditions that the esp8266-01 has).
the booklet is for uno/mega 2560
quartz furnace
Hmmm since the code is short for a “Hello World” can you post it here ?
stone dirge
This is the original, unaltered code:
int val;//define variable val
int ledpin=13;// define digital interface 13
void setup()
{
Serial.begin(9600);// set the baud rate at 9600 to match the software set up. When connected to a specific device, (e.g. bluetooth), the baud rate needs to be the same with it.
pinMode(ledpin,OUTPUT);// initialize digital pin 13 as output. When using I/O ports on an Arduino, this kind of set up is always needed.
}
void loop()
{
val=Serial.read();// read the instruction or character from PC to Arduino, and assign them to Val.
if(val=='R')// determine if the instruction or character received is “R”.
{ // if it’s “R”,
digitalWrite(ledpin,HIGH);// set the LED on digital pin 13 on.
delay(500);
digitalWrite(ledpin,LOW);// set the LED on digital pin 13 off.
delay(500);
Serial.println("Hello World!");// display“Hello World！”string.
}
}
mind you I am a complete amateur with this. my only coding knowledge is from a c++ class I took 10+ years ago, so I don't remember anything
obviously when I did the code for the esp-01s I adjusted the baud rate and ledpin
quartz furnace
How about this sketch to simply troubleshooting
void setup() {
Serial.begin(9600);
Serial.println("Hello World!");
}
void loop() {
}
stone dirge
should i keep the baud rate at 9600 or 115200?
quartz furnace
I’d go with 115200 and edit the 9600 in the pasted code
stone dirge
ok
so just to be clear, I upload to the esp-01s with the usb adapter set to uart and then reset and flash boot it correct?
Okay I just ran the code and nothing is happening
led is on, but no response on monitor
quartz furnace
Any errors on the Arduino IDE?
stone dirge
no errors that i notice
blazing sierra
quartz furnace
@stone dirge and you are matching the 115200 on the Arduino IDE and in the code ?
stone dirge
yes, i think, upload speed is set to 115200
quartz furnace
Hmmm and if you go back to the serial port it still has an active connection?
brittle thicket
Hey there, I am testing out low power programming on my Feather Lora, (rather unsuccessfully), and saw Ladyada using a usb power analyzer. It was an expensive one, but really handy. I was wondering if anyone knows of cheaper options or even DIY options to get the same capability to see a timeline of power usage via the USB port, or otherwise.
pine bramble
is there a way to encrypt or hash using arduini code?
is there a cryptography library?
cedar mountain
A quick search turns up https://www.arduino.cc/reference/en/libraries/aeslib/ for example.
If you have a favorite portable C/C++ library, that can probably be used without a lot of trouble too.
formal onyx
I have a 5v 3+amp PSU powering a dozen servos, is it safe to also connect this to the gnd and vin of the arduino to power the arduino? I know the arduino won't draw more than it needs but the servos wont then draw too much power from the arduino, vin is only an input?
cedar mountain
On most Arduinos, VIN wants 7-12V, though you can also feed it 5V directly on that pin instead. If the servos overwhelm the power supply, it could brown out the Arduino, but it should otherwise be safe.
quartz furnace
Thoughts on if In best practice he should also have a diode since there are servos (motor) ?
cedar mountain
That's a good question, and I'm not sure. I haven't generally seen that needed with servos, but hopefully someone with more insight can provide a definitive answer.
pine bramble
Small servos can often benefit from a decent sized electrolytic cap across the power leads.
Haven't really seen a snubbing diode needed with them, but it's always a possibility.
deep hazel
is the only way to get a degree symbol (°) in the Adafruit GFX library basically to draw it manually any time i need one when using the classic font?
north stream
With the TFT library, I can use \xf7 to get the degree symbol, that might work with the GFX library too.
deep hazel
thanks, i'll give it a shot, typing the symbol into the IDE might be doing some weird unicode one instead of the OG ascii one
formal onyx
Yeah I tried using VIN but it does just cause brownouts. I'll have to figure something else out
honest wren
I'm trying to play audio off a Seeeduino XAIO, having no luck with circuitpython so far. Also can't do pcm playback with arduino the way I can with a regular arduino chip. Any recommendations on getting audio playback working on this chip?
gusty vault
I have two STEMMA Soil Sensors that I just got from Digi-Key and using the sample code I get pretty much 24-26C on the temp, and a solid 65535 no matter what I do for the capacitive measurement. Anyone have any idea what is wrong? Could both sensors be bad?
haughty wigeon
What pin on my Feather M0 should I be using to drive my strip of NeoPixels?
north stream
Hello, i have an infrared sensor. i connected it to analog pin 0. i used the following code with it to give me the distance. when i put my hand close to it, it gives me 165. when i dont have anything in front of it, it gives me 160. I also tried to adjust the middle distance manipulator but did not make a difference. is this what its supposed to do?```
#define IR A0
int Obstacle;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
pinMode(IR, INPUT);
}
void loop() {
// put your main code here, to run repeatedly:
Obstacle = analogRead(IR);
Serial.println(Obstacle);
delay(500);
}```
cedar mountain
What's the specific sensor?
north stream
ill give you a pic
cedar mountain
A part number would be more useful.
north stream
where do i find that?
cedar mountain
Did you just find it on the side of the road? I presume you bought it somewhere where it was described as a specific sensor device.
cedar mountain
Gotcha. So I guess you'll just need to experiment with it, since there's no way to know what it's supposed to do without knowing what it is.
cedar mountain
🤷
north stream
i do not know either
cedar mountain
Sorry, I'm the sort of person who reads datasheets and designs things to work that way. I'm not the right person to try to get junkyard gear up and running...
north stream
okay
ill try and find a way to see which type it is
can i DM you when i find which type it is @cedar mountain ?
formal onyx
I have one of those
formal onyx
The infrared sensor. I don't know what it is called, but I know I got it from a mixed bag kit and I should be able to track it down and find the parts list, give me a few minutes
formal onyx
I found an identical sensor in an Elegoo sensor kit, but it doesnt have a part number- simply listed as 'tracking' sensor. Sorry :/
north stream
can you please test it with the code above and 3 wire connections and let me know if it gives you similar values?
please?
formal onyx
Yeah sure
north stream
this is my connections
im not sure if the connections actually worked cause i never tried it before
formal onyx
I got very different results
north stream
like what?
formal onyx
My understanding is that this sensor is not meant to sense distance, only proximity
Meaning itll report one value if there is nothing in front of it, and another value if something is
Not proportional to its distance from the sensor
north stream
okay
formal onyx
I got a value of 1023 when nothing is in front of it, and about 23 when blocked by my hand
The pot in the middle is used to adjust sensing distance
north stream
i already tried adjusting it
formal onyx
The red light should not light up when nothing is in front of it
north stream
i know
formal onyx
If it's lighting up all the time you have to turn the pot counter clockwise
If it stays on regardless then something must be wrong with the sensor
north stream
okay
ill try that
i turned it all the way
not working
led on
i think its not working
anyways thank you so much
formal onyx
No problem, sorry you couldnt get it working
Could be too much external lighting? I don't know
dull bison
Hey guys, is it possible to get an average value from an analogue input if i measure it for 10 milisec?
I notice in the plotter the value isnt stable so i want to get an average to work with
lone ferry
You can always calculate the average yourself.
dull bison
k example, does this work?
x = (analogRead(0) + analogRead(0) + analogRead(0) + analogRead(0) + analogRead(0) ) / 5);
Is my Arduino gonna take each reading of the analogue input seperatly over time or is it gonna be filled in with the same value
lone ferry
You could do it in a loop with a small delay.
dull bison
that is A solution
im trying to figure out how long it takes for the arduino to measure a single analog reading
like, is the arduino fast enough to give me the absolute min val and max value of an analogue reading from a sensor when i touch it. Can i count on it to be accurate? because my plotter shows me a good representation, but if i do the same in the monitor and compare the numbers it looks like it doesnt get the same details
lone ferry
If the signal changes from high-to-low-back-to-high in between two calls to analogRead(), you wouldn't read the low value.
dull bison
yeah i understand that, but is there a way to figure out the speed it can read it out?
north stream
Should be in the IC's data sheet.
lone ferry
You could also create a loop that runs for X ms:
long count = 0;
unsigned long startTime = millis();
while (millis() - startTime < 10) {
int value = analogRead(0);
count++;
}
Serial.println(count);
thx, gonna check it out
dull bison
around 9 measurements a milisec, if ppl wanted to know
Anyone know how to creqte qn unknown sized array. I need an array to stock ints in, but i can never know how many it will be at start of code?
vivid rock
if you need not one reading but continuous stream of readings, common approach is using low-pass filter:
float averagedReading=analogRead(0);
while (true) {
averagedReading=0.7*averagedReading +0.3*analogRead(0);
Serial.print("New reading: "); Serial.println(averagedReading);
}
numbers 0.7 and 0.3 can be changed
north stream
You can just create a pointer like c int * arrayPointer; to an array of ints, then use malloc() when you know how many ints you need (but storage on an Arduino is scarce, and malloc isn't very efficient)
You'd assign it with something like ```c
arrayPointer = (int *) malloc(num_ints * sizeof(int));
cunning reef
If I have a bunch of "if" statements, and I have an "else" statement at the end of my program, how would I address all the variables in the parameters in my "if" statements to tell the "else" loop to run if they're all false?
obtuse spruce
There are two common patterns here:
if (testA) {
...
} else if (testB) {
...
} else if (testC) {
...
} else {
... // runs only if all of testA, testB, and testC are false
}
-or you might be after-
if (testA) {
...
}
if (testB) {
...
}
if (testC) {
...
}
if (!testA && !testB && !testC) {
... // runs only if all of testA, testB, and testC are false
}
In the first case, only the code for the first test that is true will run. In the second, any code for a test that is true will run, and the last one only if all were false.
If you want to do the later, but the testX things aren't simple variables (they are expressions), or there are many of them, and you don't want to repeat all that in the final if, you can do this:
bool doDefault = true;
if (testA) {
doDefault = false;
...
}
if (testB) {
doDefault = false;
...
}
if (testC) {
doDefault = false;
...
}
if (doDefault) {
... // only run if any of the above didn't run
}
Hope that is what you were looking for, @cunning reef
cunning reef
Yes, the second one is exactly what I want to know. Thanks!
dull bison
if you need not one reading but continuous stream of readings, common approach is using low-pass filter:
float averagedReading=analogRead(0); while (true) { averagedReading=0.7*averagedReading +0.3*analogRead(0); Serial.print("New reading: "); Serial.println(averagedReading); }
@vivid rock
Thx im gonna give it a try
You'd assign it with something like ```c
arrayPointer = (int *) malloc(num_ints * sizeof(int));
@north stream thx for clarifying
Is there a clean way to check for the highest measured value of an analogueRead in a certain timewindow. I now check if my current value is bigger than previous and keep doing that
north stream
That's how I do it
dull bison
yeah i figured, but there might have been some function that does it for me i dont know bout
lost kraken
Would using an arduino to make a controller using HID be the same as a regular controller?
slow nebula
qucik question... if i connect a LED to a 3.3V of my arduino.... do i have to put a resistance to protect my arduino ? (the LED was previously powered by 4.5V aka 3*LR41 battery)
obtuse spruce
Er, you need a resistor to protect the LED.
gilded swift
At least a 20ohm resistor at that
If it’s blue/green LED. Probably a 100ohm for red/yellow
formal onyx
Can I use any bluetooth receiver board to control an arduino nano with a ps4/bluetooth gamepad? In guides I can find online they use boards with a USB port, and a USB bluetooth receiver. But I would rather use something like the HC-05 because it is much smaller and doesnt require an external receiver.
gilded swift
I’m sure there is a way
formal onyx
Nevermind, I finally got my esp32 working so im moving to that now
gilded swift
I think the biggest issue is you are not setting your data pin in the Arduino code for output
celest sequoia
@gilded swift you're talking to me?
gilded swift
Just do pinMode(DATA_PIN, OUTPUT)
Yeah
I’m not aware of FasLED library sets pin mode or not
celest sequoia
i dont quite get wwhat yo're saying
sorry, its my firsrduino project
it's my first arduino project*
gilded swift
You’re okay let me look at your code based on the example on the github page
celest sequoia
Heyguys, for some reason my leds don't light up. This is 12 second move of my circuit, and this is the code:
#include <FastLED.h>
#define LED_TYPE WS2812B // type of RGB LEDs
#define COLOR_ORDER GRB // sequence of colors in data stream
#define NUM_LEDS 9 // 60 LEDs numbered [0..59]
#define DATA_PIN 6 // LED data pin
#define BRIGHTNESS 200 // brightness range [off..on] = [0..255]
// Define the array of RGB control data for each LED
CRGB leds[NUM_LEDS];
void setup() {
// initialize library using CRGB LED array
FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
}
void loop() {
// configure some LEDs by direct RGB level setting
leds[0] = CRGB(255, 0, 0);
leds[1] = CRGB(0, 255, 0);
leds[2] = CRGB(0, 0, 255);
leds[3].r = 128;
leds[3].g = 75;
leds[3].b = 170;
leds[4].setRGB(50, 100, 150);
leds[5] = 0x08FFA7;
FastLED.show();
delay(1000);
}
What can be the problem ? Honestly, i'm outta ideas
gilded swift
Try changing LED_TYPE to NEOPIXEL, and remove color order
Oh and can you put your code between 3 ` on each side so it formats better
vivid rock
and indeed, add in setup
pinMode(DATA_PIN, OUTPUT);
CRGB leds[1];
void setup() { FastLED.addLeds<NEOPIXEL, 6>(leds, 1); }
void loop() {
leds[0] = CRGB::White; FastLED.show(); delay(30);
leds[0] = CRGB::Black; FastLED.show(); delay(30);
}```Try that code
celest sequoia
erase everything and try yours?
gilded swift
Just comment it out
gilded swift
Block comment your entire code, and paste that code in
/** block comment example */
formal onyx
Trying to set up my ESP32 with wifi- I am following this guide: https://create.arduino.cc/projecthub/benjineering/easy-iot-remotely-controlling-esp32-using-an-android-app-99a1dd
I've installed the library they listed, and im trying to compile but I get the following error: "Multiple libraries were found for "WiFi.h""
gilded swift
Have you downloaded the libraries? @formal onyx
formal onyx
The ESPAsync yes, WiFi (should be?) included in the IDE already
gilded swift
Always good to double check
gilded swift
Did you download the FastLED library @celest sequoia
gilded swift
Okay
formal onyx
But yes it is definitely installed, it is available in sketch > include library > contributed libraries
gilded swift
And you’re positive you’re hooked up to D6?
celest sequoia
Yeah
gilded swift
Hmm okay
celest sequoia
I mean, ive changed the pin to 12
But ive also changed your code
any ideas?
@gilded swift
gilded swift
I’m looking to see what might be wrong
But I think you still might need to add pinMode(DATA_PIN, OUTPUT)
celest sequoia
its not my only led strip, as well as arduino
so ifthey are a problem, its no problem at all
gilded swift
Maybe swap them around
celest sequoia
@gilded swift there re 2 GND pins,should i connect the ground tothe pin on the D (digital probably?) row or, the one closer to 5V
gilded swift
either ground pin works
honest wren
Does anybody know if there is a PCM playback sketch that will work on the SAMD21?
gilded swift
hmm
north stream
I'm not sure what you mean by "PCM playback" here. The SAMD21 does have an analog output.
bleak raptor
Not sure if this should go here or in #help-with-radio, but do you guys know if the receiver in this project can be modified to work with a standard RC transmitter? I'm thinking of doing an RC car project. The receiver is about halfway down the page.
cedar mountain
That's unfortunately a completely different radio frequency range and data protocol, so you'd need a different receiver rather than the nRF24L01 used here.
stone dirge
Anyone awake to help a beginner? I'm having trouble with IRRemote library and "USECPERTICK"
I have version 2.6.1 installed for the library
Please DM if you can help
Error message:
In function 'void dump(decode_results*)':
BareMinimum:65:39: error: 'USECPERTICK' was not declared in this scope
Serial.print(results->rawbuf[i]*USECPERTICK, DEC);
^~~~~~~~~~~
BareMinimum:69:46: error: 'USECPERTICK' was not declared in this scope
Serial.print (-(int)results->rawbuf[i]*USECPERTICK, DEC);
^~~~~~~~~~~
Using library IRremote at version 2.6.1 in folder: D:\vinhm\Documents\Arduino\libraries\IRremote
exit status 1
'USECPERTICK' was not declared in this scope
also to clarify, I followed a code from https://wiki.keyestudio.com/052043_Super_Learning_Kit_for_Arduino#Project_1:_Hello_World
Project 14: IR Remote Control
storm harness
I'm trying to figure out the code I would need to do this:
When given a value eg 1.7 , the rounded down value (1), rounded up value (2) and decimal part (0.7) are produced
lone ferry
You can use floor(1.7) to get 1, ceil(1.7) to get 2. I'm not sure if there is a function to get the decimal part, but you can do 1.7 - floor(1.7).
storm harness
1.7 - floor(1.7) should work right?
lone ferry
Not sure if it works when the number if negative, but if positive it should.
storm harness
the number will always be positive so this should be ok, thanks for the help @lone ferry
obtuse spruce
If you want the integral and fractional parts you can use modf: https://en.cppreference.com/w/cpp/numeric/math/modf
storm harness
I'm looking to crossfade between 2 audio sources, but have it so the crossfade value can be any float. For example a crossfade of 0.5, would fade evenly between source 1 and source 2, while a crossfade of 42.5 would also fade evenly between 1 and 2.
storm harness
okay I've figured it out : )
north stream
@stone dirge I'm guessing those instructions were written for an earlier or different version of the IR remote library. The current Ken Shirriff / z3t0 version appears to use MICROS_PER_TICK instead of USECPERTICK.
obtuse spruce
@storm harness - I'm curious what you came up with here... I'm not sure I can make sense of a function where crossfade values of both 0.5 and 42.5 make sense.... out of what range?
I mean - how could BOTH of those values mean an even fade?
storm harness
ammount = ammount - (int) ammount;
//convert to modular number space
if(ammount < 0.5)
{
gain1 = ((-2 * ammount) + 1);
gain2 = (2 * ammount);
}
else
{
gain1 = ((2 * ammount) -1);
gain2 = ((-2 * ammount) +2);
}
}
I'd guess those are rates/times
cedar mountain
The factors of 2 in the above code seem weird to me. Ordinarily I'd expect to see just x and 1-x if x is a crossfade ratio.
obtuse spruce
So, considering just the fractional part of the float, you want from 0 to 0.5 to fade from all gain1 to all gain2, and then from 0.5 to 1.0 you want to fade back from all gain2 to all gain1?
(that is what your code does, I think)
storm harness
yeah, you're correct
I couldn't come up with a way to crossfade except that
other ones dont repeat nicely
obtuse spruce
What are you trying to get? From 0.0 to 1.0 gives fade from gain1 to gain2?
Oh - you do want it to repeat
storm harness
yeah that is what i was trying to do
obtuse spruce
okay - you're good then!
lone ferry
Note that you can also do this with a sine / cosine function. Then the amount of crossfade isn't linear but that may actually look nicer.
cedar mountain
You might also consider doing an even/odd function, where 0 is source A, 1 is source B, 2 is source A, etc. That way every 0.5 is an even mix.
storm harness
this is for wavetable interpolation not for audio, so it has to be done linearly.
@cedar mountain while it is a bit of a botch fix, i just multiply the input by 0.5 and it works.
stone dirge
@north stream Thank you, I will try doing a little research on micros_per_tick
@north stream Would it be a simple as replacing USECPERTOCK with MICROS_PER_TICK?
north stream
quite possibly
stone dirge
thank you, i appreciate the help
stone dirge
Another question, if anyone is available to help. I have an ESP-01s (https://www.microcenter.com/product/615098/inland-esp-01s-usb-to-esp8266-wireless-adapter-module) I bought from micro center, I have the board installed into arduino ide (http://arduino.esp8266.com/stable/package_esp8266com_index.json) and I am using the included USB adapter in UArt mode to upload code and Flash download mode to monitor the program. My question is:
- I am not getting a response when using the AT command with the BareMinimum program. Any thoughts
I have the monitor set to Both NL & CR at 115200 baud rate
I also have the upload speed set to 115200 in the ide
- I also tried uploading and running the Blink example, which worked perfectly.
- I don't know why I used numbered bullet points as I only have one question haha
This is what I am getting in response to the AT command:
twilit hare
does anyone know of any examples of playing audio with a PyPortal using ARDUINO? [Update - found some info on the adafruit website - looks like they don't suggest using the audio with Arduino... so maybe I'm gonna be forced to build this project in python after all) 🙂
wintry igloo
im using the adafruit feather motorshield, im struggling with the sample code, when the motor is triggered im wondering how to control how long it runs
my Motor->run(FORWARD)
im trying to use the feather to connect to adafruit.io to open and close my chicken door :\
ive got the hardware all figured out 😛
does anyone know of any documentation that could help?
cedar mountain
The simplest method would be to use a delay, then stop the motor: myMotor->run(FORWARD); delay(1000); // 1 second myMotor->run(RELEASE);
wintry igloo
1000 is one second, awesome!
milliseconds, duh
Thank you!
i might be able to figure this out!
wintry igloo
i got it working and connected to adafruit.io!!
im missing something though
it was " if(data->toPinLevel() == HIGH)"
i dont really understand the data conversion from the io.
north stream
It looks like you have two problems. One is you're handing in a pointer to an object, but checking if it's 0 or 1 (unlikely: you probably want to access an instance member or call a method). The other is that you're using the assignment operator = instead of the comparison operator ==
wintry igloo
I think i cant have my adafruit.io switch say open/closed it has to be 1 or 0
but it doesnt like the second IF
is what i had from the sample
:\
north stream
I don't understand why you changed it.
wintry igloo
i dont understand the code :{
bleak raptor
@cedar mountain thanks! Do you know of any projects that are compatible with a standard RC transmitter? Most of the ones I see are designed like that one, with a custom transmitter.
wintry igloo
i changed it back
*sweat
oh wait it compiled this time!
how does it change 1 or 0 to low or high
north stream
The Arduino code has definitions for "LOW" and "HIGH"
north stream
@bleak raptor ordinary RC protocol is a special case of PWM.
bleak raptor
Alright 🤔
north stream
There's a nice writeup on it here https://www.pololu.com/blog/17/servo-control-interface-in-detail
wintry igloo
oh sorry i mean it seems to run both instances of the IF
it does the 1 task then the 0 task
i dont need pinlevel, can i just do a IF that checks the feed data?
¯_(ツ)_/¯
can i use IF and a specific value like 1, 2 or 3, not high vs low?
obtuse spruce
yes if (data == 3) ...
wintry igloo
hmm it complained about that when i did it
i think i fixed it by adding int reading = data->toInt();
north stream
data is still a pointer to an instance, not an integer. Comparing or casting it to integers is unlikely to do what you want
obtuse spruce
what is the type of data?
AdafruitIO_Data* I see, so it is a point to something
ah - so, AdafruitIO_Data is "opaque" in the sense that you can't just simply reach in and grab the low level data... You must ask it for the data.
so something like if (data->toInt() == 2) ...
Now, it turns out "to be helpful" a value received this way can be coverted to any number of basic types.
You can call:
toBool()
toInt()
toPinLevel()
toDouble()
toRed()
....
There are a zillion of them. Now, which one to use depends on what data you think you are expecting. If you are expecting an integer - than use toInt().... if you are expecting a pixel color, try toNeoPixel()
If you are expecting a boolean value, you can use toBool()... or the even cleaner isTrue() and isFalse() -- like so: if (data->isTrue()) { .... }
Of course, the data sent by the other side will have to be in some compatible format.... So if the other side of the project is sending HIGH and LOW, then by all means use toPinLevel() -- If the other side is sending integers as a sort of stand in for commands ("1 means close, 2 means open, 3 means flash the lights, 4 means dispense kitty treats, ....") --- then use toInt() and test as we suggested.
Hope that makes some sense.
wintry igloo
thank you all so much!
i think i got it!
i changed the if statement around, it seems to work better too
if (action) else (non action message)
im testing it in the coop now
obtuse spruce
in the coop... I suppose I should have said "4 means dispense chicken treats...." 😁
wintry igloo
this works well 😄
working so far
😄
whats the worst that could happen....
tame temple
hi everyone, i'm new here
i need some help about arduino code ( i'm still a beginner )
i'm doing a project using:
LCD 16x2 ( changed from LCD keypad shield )
AS608 Fingerprint Sensor
4 Relay 12volt
arduino nano
4 buttons
and 4 solenoid locks
i'm sorry if i'm using the wrong chat
and here is the code:
obtuse spruce
okay - what's the help you need....
(first thought: that is a lot of code for a single file.... should probably be split up)
tame temple
i'm a beginner so i don't know how to split it up
anyway
i shouldn't have put that one first but
i was using an Analog pin to control 4 buttons
and change the display screen on LCD up, down, right, left
but now i need to changed it to a different pins ( digital pin )
obtuse spruce
I see, your problem is here:
int up_hit = digitalRead(up);
int down_hit = digitalRead(down);
int right_hit = digitalRead(right);
so i need help to make the button do the same thing as the analog pin
obtuse spruce
You see - when this code runs - the button states are read once, and the value saved in each of those three variables.
Later - when you this code runs:
int evaluateButton(int x) {
if (right_hit == LOW) {
x = 1; // right
} else if (up_hit == LOW) {
x = 2; // up
} else if (down_hit == LOW) {
x = 3; // down
}
return x;
}
i want to clarify that
obtuse spruce
It is not testing the current state of the pins, but instead, the state of the pins at the time up_hit etc. were initialized.
tame temple
this is the original one:
readKey = analogRead(0)
button = evaluateButton(readKey)
int evaluateButton(int x) {
int result = 0;
if (x < 50) {
result = 1; // right
} else if (x < 195) {
result = 2; // up
} else if (x < 380) {
result = 3; // down
} else if (x < 790) {
result = 4; // left
}
return result;
}
int evaluateButton1(int x) {
int result = 0;
if (x < 50) {
result = 1; // right
} else if (x < 195) {
result = 2; // up
} else if (x < 380) {
result = 3; // down
} else if (x < 790) {
result = 4; // left
}
return result;
}
that was not right, either. (assuming that that is at global scope)
also, this line is not doing what you think:
button = evaluateButton(readKey);
So, let's go back to
int up_hit = digitalRead(up);
ok
obtuse spruce
What this line of code means is this: "When this line is executed..... call the function digitalRead with the argument up which will read the state of the hardware pin and return a value, HIGH or LOW. Then create a variable named up_hit and initialize it's value to that result."
Let's start with that - is my description clear?
obtuse spruce
Good. Now, if this line were in a function, like this, say:
void loop() {
int up_hit = digitalRead(up);
...
}
Then it would be executed once each time the function was called.
But in your code, that line is outside of any function. We say this is "global". And that means the line code is executed once at the start of the program (somewhat before setup() is called).
It will only ever be called once, and in this case before you have even set up the pins in setup()!
Does that make sense?
tame temple
yes
obtuse spruce
So - rather than writing
if (right_hit == LOW) {
you should be writing
if (digitalRead(right) == LOW) {
which will execute the call to digitalRead() each time that if statement is executed, thus reading the pin afresh.
Do you see how the existing code wouldn't ever look at the pin after the start of the program.... whereas the second version will re-read the pin each time?
tame temple
hmmm.. yes
obtuse spruce
It is important to get the "operational model" of how C code works in your head: Saying x = .. some thing else ...; is not like regular math: Later when you use x, it is not the same as the "some thing else" - At the time the assignment (x = ...) was executed x was set to the result of executing the some thing else.... then later when you use x, you are using that stored value. No matter if "some thing else" would now be different, x is the stored value until another assignment is executed.
Of course, if the program executes x = 3 + 4; Then later, using x is exactly the same as using (3 + 4) -- because the value of 3 + 4 can't ever change.... The difficulty comes in with expressions that can: digitalRead() depends on the state of hardware that can change. millis() depends on the state of timers... and in x = 10 * y; the expression 10 * y might change if y changes!
void setup() {
int y = 5;
int x = 10 * y;
Serial.begin();
while (!Serial);
Serial.println(x);
y = -2;
Serial.println(x);
y = 10000;
Serial.println(x);
}
All of those print 50... because the value of 10 * y was evaluated and stored in x on that one line at the top... no matter that y changed later... x was only assigned to once.
Does that help clear up what was wrong with the way the pins were read?
tame temple
yes i understand
obtuse spruce
great!
okay - one more thing
You have code like this:
button1 = evaluateButton1(readKey1);
and later this:
int evaluateButton1(int x) {
if (right_hit == LOW) {
x = 1; // right
} else if (up_hit == LOW) {
x = 2; // up
} else if (down_hit == LOW) {
x = 3; // down
}
return x;
}
ye, i wasn't understand how the original code works
since everything was putting all of it into a variable name: result
obtuse spruce
When you pass a value like that (readKey1) to a function declared like that (int x) -- the function cannot change the value of the variable in the caller. In this case, evaluateButton1 cannot change readKey1.
Okay, It should look like this:
button1 = evaluateButton1();
and
int evaluateButton1() {
int x;
if (right_hit == LOW) {
x = 1; // right
} else if (up_hit == LOW) {
x = 2; // up
} else if (down_hit == LOW) {
x = 3; // down
}
return x;
}
which can be simplified:
int evaluateButton1() {
int x;
if (right_hit == LOW) {
return 1; // right
} else if (up_hit == LOW) {
return 2; // up
} else if (down_hit == LOW) {
return 3; // down
}
return 0;
}
(er - replacing all the right_hit like things with the digitalRead function calls as described above)
obtuse spruce
Also evaluateButton and evaluateButton1 are identical - no need to have both!
okay - bed time for me... Good luck!
quartz furnace
Good morning all. Need help with adding to an array " char txtMsg[200];"
I have a RTC and I wan to add the .hour + .minute + .second at the time of the message before sending
too many arguments to function 'char* strcpy(char*, const char*)' << Is my error
strcpy(txtMsg, "cat" + clock.hour, DEC); < is a snip of the code line
RTC is the DS1307
cedar mountain
Several things are going wrong there, I think. For one the DEC parameter is only used in the Arduino print routines, not the general C str library calls. The use of + is likely not doing what you expect with character arrays, since it's actually performing pointer arithmetic. And strcpy doesn't concatenate, just overwrites... you'd want strcat for that instead.
But it looks like you would want sprintf() in general for this kind of operation, where you want to construct a string from placeholder text plus numeric variables.
quartz furnace
okay looiing into strcat() ughhh Not the best with Strings/Char/Arrays etc
obtuse spruce
try something like:
snprintf(txtMsg, sizeof(txtMsg), "cat%2d.%02d.%02d", clock.hour, clock.minute, clock.second);
Some notes on this:
- always use
snprintf, neversprintf(makes sure you don't overrun your buffer - the
%2dmeans a two character wide decimal field,%02dmeans the same, only zero padded,%dwould be just decimal, as small as needed - replace the
dwithxfor hexadecimal - I believe that not all Arduino core libraries have a full implementation, and may not support all the features of the
--printffamily of functions... though they will support the above.
quartz furnace
ahhh it worked
now if I want to put a space after "t" in "cat" do I need to put a "%" someting before the %2d ? I just can't put a space like this "cat %2d......."
obtuse spruce
just put in a space!
The format string is just copied into the buffer, but replacing each % field descriptor with the next argument from what you passed.
quartz furnace
Works .. just seems like it takes longer to send
actualy, the same.. must have been a random delay by the cell network
obtuse spruce
I'm not sure where or how you're sending it - but the difference between using snprintf and other ways of building up that string are minuscule.
quartz furnace
It is working just fine now, Appreciate the help.. Have it exactly doing what I want
obtuse spruce
If you want to learn more about that function, and the "mini-language" for format strings, see here: https://en.cppreference.com/w/cpp/io/c/fprintf
quartz furnace
Yeah that would be very helpful.. I was using "sprintf(txtMsg, "%02d:%02d:%02d", clock.hour,clock.minute,clock.second, " cat");" Before you jumped in to help
It was not printing 'cat' but did the time
obtuse spruce
yes, you'd need a %s specifier if you want it to include a string from the argument list... but if that string is fixed (like "cat") you might as well just put it in the format string.
quartz furnace
Gotcha... Off to read the link you sent now and getting some lunch .. Thanks again @obtuse spruce It is wokring 100% perfect
obtuse spruce
welcome
safe shell
@obtuse spruce snprintf looks handy, I wonder what Arduino Serial.print() uses under the hood
obtuse spruce
I believe that the Arduino cores have a Serial print functions are all just hard coded for each type. The Adafruit cores add Serial.printf which uses vsnprintf under the hood.
(the v version is just variant that allows one var-args function to call another)
pulsar yacht
Hello this is my firs message in this server, so first of all thanks, and sorry if my English is not very well.
I have some issues working with the AdafruitIO and the PubSubClient library running on the esp8266. I read in the adafruit webpage that is compatible.
The connection is correct because I can see the information published with the esp8266 on the dashboard, and I receive correctly the messages from the adafruitIO to the esp8266. The problem is that after a little time, appears “failed, rc=6 try again in 5 seconds”, then reconnects again, and repeat this situation. Sometime reconnect immediately, and sometimes no.
Someone know what the problem is?
Thanks
stuck coral
Do you have a link to which fork of pubsub youre using? The usual version does not have a state value of 6
jovial heart
i am starting out with Arduinos and i know a a little bit about programming and is there any good tutorials on programing a Arduino
north stream
You can start with things like this https://learn.adafruit.com/lesson-0-getting-started
pulsar yacht
Do you have a link to which fork of pubsub youre using? The usual version does not have a state value of 6
@stuck coral i installed the library directly from arduino library manager
but i read on som github issu that the 6 will be coming from the adafruit broker, not the client
pulsar yacht
I changed the clientID and for now is working....
wraith current
@pulsar yacht good catch. That happened to me too. Gotta use a real unique I'd when on a server with many other users.
pulsar yacht
@pulsar yacht good catch. That happened to me too. Gotta use a real unique I'd when on a server with many other users.
@wraith current It's strange because i have connected only one esp8266, but now its working...
wraith current
@pulsar yacht my point is that you're not the only one connecting to that mqtt broker
pulsar yacht
@pulsar yacht my point is that you're not the only one connecting to that mqtt broker
@wraith current ahh okay. I thought that i was the only because i was working in my account with only one esp. Thanks!
wraith current
@pulsar yacht the mqtt broker keeps track of every device based on it's id.
stone dirge
Can anyone help me with setting up a circuit for controlling an led with my esp-01s?
I have 3.3v and ground from mega 2560 going to vcc and ground of the esp-01s
gpio1 from esp-01s going to positive of led and negative of led going to ground
reef ravine
you'll need a current limiting resistor in series with the LED
stone dirge
220 ohm ok?
@reef ravine can you confirm that the gpio1 is pin 2 on the esp-01 module? Im not sure
reef ravine
220 would give you about 5 mA
it looks correct, here is a link with pinouts about 1/4 down https://circuits4you.com/2016/12/14/esp8266-pin-diagram/
stone dirge
would you recommend using a smaller or bigger resistor?
reef ravine
what color LED?
stone dirge
red
gilded swift
Red/yellow on 3.3V would need a larger resistor than blue/green. 300-330 for red/yellow, 220 is good for blue/green
reef ravine
The forward voltage drop of different colors is different
stone dirge
1k or 10k?
btw i am very much so a beginner at this, so sorry for the lack of knowledge
reef ravine
For red then you have 3.3v - 2.0v = 1.3v. 1.3v / 220 ohms = 6 mA
stone dirge
ok so using a blue led with 220 ohm would be ok?
gilded swift
You could do 220 on red, it just might be brighter than you need
stone dirge
this is purely experimental, so it doesn't need to be red
gilded swift
6mA across a red is considerably brighter than 6mA across a blue
stone dirge
im just trying to learn
gilded swift
Try out both and see which you like best
reef ravine
the key point is you need to limit the current being drawn from a pin on any MCU
stone dirge
ok so trying it with neither the blue nor red work with the 220. I'm assuming that I don't have it setup right
reef ravine
do you have a multimeter?
stone dirge
yes
stone dirge
i have the small pin on the led connected to the resistor which is going to ground
the longer pin is going to the gpio1 pin on the esp01
reef ravine
the shorter lead is generally negative so that sounds correct
are you using a breadboard?
stone dirge
yes
the breadboard is being powered by a mega2560 because i don't have a seperate power supply to power it
reef ravine
if you measure GPIO1, is it high?
stone dirge
positive on the breadboard is going to 3.3v, and ground to ground
reef ravine
sounds like a good way to power the ESP01
reef ravine
does it go to 3.3 if you remove the LED and / or the resistor?
for that matter, is Vcc to the ESP actually 3.3v?
reef ravine
i'd measure from Vcc to ground at the ESP and make sure it is being properly powered
reef ravine
ok, if unconnected then GPIO1 should be 0 or 3.3v
if it is short you can paste it here, use the "backtick" to format it like this
reef ravine
are you connected via serial to the ESP? it uses GPIO1 for serial TX
use pastebin.com and post the link here
stone dirge
there is also a config tab if you need to see that
its an adafruit io example btw
the coding was uploaded to the esp via a separate adapter
reef ravine
first thing i notice is you have #define LED_PIN 2, "which pin is which" varies from board to board
stone dirge
I honestly am unsure
reef ravine
try changing the define to pin 3 and connect to GPIO2
stone dirge
ok i'll do that now
reef ravine
pin 2 is being used the serial interface
the ESP01 seems to have a limited number of IO pins compared to other variants
stone dirge
even though im just using the mega as a power supply, do i need the rx tx pins connected? or is that just for uploading?
reef ravine
Tx and RX are used for serial programming, using the mega as a convenient 3.3v power supply is fine
reef ravine
#define LED_PIN 3 means "substitute 3 wherever LED_PIN appears in the code"
stone dirge
ah i see
reef ravine
it's handy so if you decide to use a different pin you only need to change your code in one place
stone dirge
ok uploading now
ok so now gpio2 is pulling 0v but I cant seem to get it to pull high
stone dirge
the mega is not outputting power...
reef ravine
bad connection?
stone dirge
no im just dumb... lol i had the multimeter on ac... power is fine
reef ravine
so does pin 3 toggle between 0 and 3.3v?
stone dirge
no only 0v
reef ravine
if you move the LED to Vcc, does it glow?
stone dirge
yes
stone dirge
what do you mean?
reef ravine
are you using the Arduino IDE?
stone dirge
yes but the esp is not currently connected to that
im trying to control it through adafruit
sorry i probably should have led with that
i did confirm that it is connected
using the included usb adapter
reef ravine
the serial terminal will show diagnostic messages (all the "Serial.print" statements)
stone dirge
so then should i connect the tx rx on both boards to eachother?
reef ravine
what did you mean by "included usb adapter"?
reef ravine
ok, then after upload you transferred to the breadboard?
stone dirge
yes exactly
reef ravine
it might pay to wire the adapter to the breadboard so you have power and serial from it, then you don't need the mega for power
stone dirge
honestly have no idea how to even get started on that lol
reef ravine
you would wire it one to one, the pins on the ESP to the corresponding socket on the adapter, all you need are Vcc and ground, Tx and Rx
stone dirge
oh i see
reef ravine
that way you still have access to the pins and you can use the serial monitor to help debug
stone dirge
i'll go ahead and try that now and i'll get back to you
reef ravine
come to think of it, how are you mounting that module on a breadboard? either rows or columns will be shorted....
stone dirge
i have male to female leads
reef ravine
ah, ok
stone dirge
ok all connected
reef ravine
you have Serial.begin(115200); so the Serial Monitor needs to be set the same
stone dirge
i have the monitor set to "Both NL & CR" at 115200 baud
Monitor reads:18:29:09.763 -> ⸮.........
18:29:16.970 -> Adafruit IO connected.
18:29:17.110 -> received <- LOW
reef ravine
ok, now send a HIGH (however you are doing that with your IoT provider)
reef ravine
ok, so my guess about "which pin is which" was probably wrong
stone dirge
should i move it around to different pins to check?
reef ravine
on these boards you need the pin definitions, as physical pins and GPIO pins may be different
see if you can find the pin which toggles with the DVM
stone dirge
dvm?
reef ravine
Digital Volt Meter
reef ravine
https://components101.com/wireless/esp8266-pinout-configuration-features-datasheet, looks like only pins 5 (GPIO0) and 3 (GPIO2) are available for your use
reef ravine
serial says it's toggling, so the pin specified must be wrong
reef ravine
this module seems a bit "pin short", some more info is here https://www.instructables.com/id/How-to-use-the-ESP8266-01-pins/
stone dirge
i tried on and off with all the pins, they all stayed the same
reef ravine
I generally use a Wemos D1 Mini, about the same size but more pins are broken out
stone dirge
Yeah, i bought this with minimal research.
reef ravine
see this, about halfway down http://www.forward.com.au/pfod/ESP8266/GPIOpins/index.html
looks like you can use GPIO0 and 2, but they are normally HIGH and your program needs to set them low
stone dirge
so, to my understanding if i were to switch to pin 5 it should work?
because it pulls from low to high rather than high to low like on pin 3
correct me if im wrong
or switch HIGH and LOW on the code
reef ravine
i'd stick with pin 3 (GPIO2) but change the logic in your sketch to set the pin LOW rather than HIGH
stone dirge
ok let me try that
if(data->toPinLevel() == HIGH) Serial.println("HIGH"); else Serial.println("LOW");
switch all of those correct?
reef ravine
looking at it, just reverse the LED circuit, Vcc > LED anode, LED cathode > resistor > pin 3
looks like pin 3 will always be HIGH, sending LOW would then turn on the LED
reef ravine
flip it and tie it to Vcc rather than ground
reef ravine
in this case 3.3v is Vcc
stone dirge
OK that makes sense
reef ravine
Vcc is a generic term for "positive power supply", could be 3.3v, 5v, 12v, whatever
stone dirge
ok, i have a lot to learn lol
ive only ever taken 2 physics classes, where we barely touched on circuits and 1 c++ class, which was 10 years ago...
reef ravine
i think Mr. Newton was still teaching physics when last I had a class in it lol
stone dirge
ok so that didn't seem to work
reef ravine
if you measure pin 3 does it ever go low?
stone dirge
im getting about 2.3v on pin 3
reef ravine
double check that the anode of the LED is going to Vcc, maybe it's backwards
restive pond
Yo can anyone help me start out with arduino
stone dirge
@reef ravine ah i had the led flipped
reef ravine
ok, I have to go, good luck with it!
stone dirge
hey thank you so much for the help
I really appreciate it
i'll just keep messing around with it. have a good one
upper cargo
does anyone know other resources for heritage arduino ide -- micr$oft site not offering. win 8.1
north stream
The previous releases are available on the download page https://www.arduino.cc/en/Main/Software
broken summit
NeoPixel matrix
Hello is there anyway to rotate the way text scrolls on a matrix i need it to scroll landscape but at the moment its scrolling portrait and i am unsure on how to do this if anyone can help thanks
north stream
I think the GFX library supports various ways to orient and scroll text
broken summit
it think it has but i am unsure on how to use it
north stream
Some of the examples should show how to do things like that
obtuse spruce
@broken summit - do you want the text rotated, or just the scrolling to be vertical?
If you want drawing to be rotated, use this:
matrix.setRotation(1);
If you want it rotated "the other way", use 3.
Just do that one in setup()
broken summit
@obtuse spruce thanks this works
jovial heart
i am geting this error avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
ivory gorge
Hey all, I’ve been using an attiny85-based board similar to this one https://www.adafruit.com/product/1501
It’s great but it doesn’t have a lot of pins and I’m looking for something that has a lot more pins, such as the teensy https://www.adafruit.com/product/4323
Is there something in between? jumping all the way from an attiny85 to a teensy is massive overkill (I don’t need 90% of what the teensy offers) so I’m just trying to figure out if there’s a better option
For reference this is what I’m using currently, I have the lipo battery connector and micro USB port desoldered so I can shove it into a much slimmer space https://www.olimex.com/Products/Duino/AVR/OLIMEXINO-85S/open-source-hardware
I feel like this might be a suitable board but it’s out of stock, forgot to mention it https://www.tindie.com/products/femtoduino/femtousb-atmel-arm-cortex-m0/
woven mica
@ivory gorge arduino Nano is between those two
ivory gorge
Ooh that has an utterly delicious number of pins
I went to the dev boards section of Adafruit and started opening all the potential products in new tabs and quickly realized I would have hundreds of tabs whoops
@woven mica looks like this is the closest thing from Adafruit? https://www.adafruit.com/product/2590
Or perhaps https://www.adafruit.com/product/2010 ?
woven mica
Yes the metro mini is like Nano
elder hare
having some trouble with my Matrix here 16x16 where when it display an image, every other line is reversed! (maybe zigzag)? how do i fix this in the code so it display correctly?
elder hare
what is the best library to use a Matrix? mine is 16x16 (256) WS2812B 🙂
ivory gorge
I don’t have much experience with that but something tells me your library will have an option for row/column vs zigzag
elder hare
currently im just using FastLED library
i dunno if i have to use like FastLED_NeoMatrix lib or :S
ivory gorge
https://github.com/FastLED/FastLED/issues/35 it looks like fastled added that 6 years ago
elder hare
never had this error befor, what does it mean?
src\bitmaps/smb.h:41:1: error: narrowing conversion of '4278190080u' from 'unsigned int' to 'long int' inside { } [-Wnarrowing]
It means a variable is being converted from a more precise one to a less precise one
In this case, the value is large enough that it can affect the sign bit and cause problems
elder hare
how do i fix that exactly? :S
a value of type "const long *" cannot be used to initialize an entity of type "const long"
lone ferry
The first warning was because you should use const unsigned long. The second warning I guess is from using PROGMEM.
north stream
Also, the values given (like 0xff000000) won't fit in a const long
elder hare
weird that that would give error given im trying this -> https://github.com/joshgerdes/arduino-led-matrix/blob/master/arduino-led-matrix.ino
there is no issues posted either on that github
north stream
Either nobody has tried it, they ignored the warnings, they're running a different compiler configuration, or they didn't bother to post issues
elder hare
using progmem that means i can't alter the bitmap/image right?
north stream
It depends on when/how you want to alter it.
elder hare
i have python program running that takes a 16x16 image converts it and then sends it to the ESP32
glossy folio
hey, I'm trying to program an esp8266 board (Feather Huzzah!) from ubuntu 19 (linux kernel 5.3.0-63), and I'm having trouble getting the drivers to work, or at least getting it recognized by Arduino. I've been following this tutorial (https://learn.adafruit.com/adafruit-feather-huzzah-esp8266?view=all#using-arduino-ide) and I did the driver installation but it's still not showing up in the Arduino application. Checked with a cable i know supports data transfer, and I got it working on windows, did I do the driver thing wrong? (Also doesn't appear with lsusb)
elder hare
so i need to "fix" this
argument of type "long" is incompatible with parameter of type "const long *"
void drawBitmap(const long* bitmap) {
FastLED.clear();
bool LTR = true;
for (int i = 0; i < NUM_LEDS; i++) {
if (LTR) {
for (int j = 0; j < COLS; j++) {
leds[i + j] = pgm_read_dword(&(bitmap[i + j]));
}
} else {
for (int j = COLS - 1; j > 0; j--) {
leds[i + COLS - j] = pgm_read_dword(&(bitmap[i + j - 1]));
}
}
i = i + COLS - 1;
LTR = !LTR;
}
}
void drawAnimation(const long* bitmaps, int s, int delayTime) {
for (int i = 0; i < s; i++) {
drawBitmap(bitmaps[i]); // This is the error
delay(delayTime);
}
}
Try: const long** bitmaps
elder hare
ok that error gone
@lone ferry ty
then there is this @lone ferry
https://pastebin.com/3UhFL7vh
error given
a value of type "const long *" cannot be used to initialize an entity of type "const long"
What line?
elder hare
const long DigDugTaizo[DigDugTaizoSize] = { DigDugTaizo01, DigDugTaizo02 };
const long DigDugTaizoShovel[DigDugTaizoShovelSize] = { DigDugTaizoShovel01, DigDugTaizoShovel02 };
const long DigDugPooka[DigDugPookaSize] = { DigDugPooka01, DigDugPooka02 };
const long DigDugFygar[DigDugFygarSize] = { DigDugFygar01, DigDugFygar02 };
these
lone ferry
Pretty sure these should be const long * with the *
north stream
Those 32-bit quantities may still cause problems in a signed 32-bit variable.
lone ferry
Yes, it should really be const unsigned long *.
elder hare
that one gone, ty @lone ferry 🙂
now this error
src\bitmaps/galaga.h:41:1: error: narrowing conversion of '4278228887u' from 'unsigned int' to 'long int' inside { } [-Wnarrowing]
what was that again?
lone ferry
What we just said 😉
lone ferry
Yes, but also with static still in there.
elder hare
first error
narrowing conversion of '4278190080u' from 'unsigned int' to 'long int' inside { } [-Wnarrowing]
second error
a value of type "const unsigned long *" cannot be used to initialize an entity of type "const long *"
@lone ferry
lone ferry
@elder hare Everywhere it says const long you need to change that to const unsigned long
lone ferry
Still getting that warning?
Maybe you also need to put UL behind all those numbers then, as in 0xff000000UL. Weird that the compiler doesn't see 0xff000000 as an unsigned long, though.
Easiest way to do this is to copy those lines into a text editor and replace , with UL,. No need to type that all in. 😉
elder hare
w00t!!! 😛
lone ferry
Ah yes, you need UL behind those numbers indeed: https://www.arduino.cc/reference/en/language/variables/constants/integerconstants/
elder hare
never had that befor 😛
lone ferry
It's because the Arduino C++ compiler treats ints as 16-bit numbers, but other C++ compilers use 32-bit numbers.
elder hare
aahaa 🙂 im using Visual Studio btw
lone ferry
What device are you compiling this for?
elder hare
ESP32
lone ferry
Hmm, not sure what the sizes of datatypes are for that. But hey, if it works, it works. 😄
elder hare
not sure it's working still im converting now
@lone ferry the error is still there :S weird
lone ferry
Where?
elder hare
now it works!
now i just need to figure out how to make FastLED use ZigZag as my Matrix im pretty sure is ZigZag (so every other line is reversed)
on github it says that FastLED has fixed this and implemented this function into FastLED :S but i can't find it
quartz furnace
I got this ST25DV16K To "mess around with" https://www.adafruit.com/product/4701
THis is the demo code
It tries to compile and has issue with this part of the code "#error define the pin and wire instance used for your board"
Also board is a --> #if defined(ARDUINO_B_L4S5I_IOT01A)" Couldn't find anything helpful on a google search
Edit what board is a ARDUINO_B_L4S5I_IOT01A ?
cedar mountain
Looks like it's an STM32 Discovery board: https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-discovery-kits/b-l4s5i-iot01a.html
quartz furnace
ahhh good find
So just take that part of the code out and define proper pins for GPO. LPD, SDA and SCL?
Feather 328P I know how to find SCL/SDA ... any pins to avoid for LPD and GPO?
Actaully .. reading the product page a 328P does not have enough specs to run it.. will have to use another board
Changing to a https://www.adafruit.com/product/3010
Anyobe able to help with pin assignment ? This is the only M0 I have righ now.. should be fine to use ? I am not doing anything with Wifi just a test of the ST25DV16K
elder hare
so this is weird
my python script generated this
from this
it is correct and 16x16
however
my ESP32 displays it like this
you see the black LED (off)
only on the blue side :S
and if i flip the matrix / image it follows
This is the function that does it, any error in here that might cause this? :S
void drawBitmap(const unsigned long* bitmap) {
FastLED.clear();
bool LTR = true; // Flips the image
for (int i = 0; i < NUM_LEDS; i++) {
if (LTR) {
for (int j = 0; j < COLS; j++) {
leds[i + j] = pgm_read_dword(&(bitmap[i + j]));
}
} else {
for (int j = COLS - 1; j > 0; j--) {
leds[i + COLS - j] = pgm_read_dword(&(bitmap[i + j - 1]));
}
}
i = i + COLS - 1;
LTR = !LTR;
}
}
For faster help maybe in the help withCircuit python?
quartz furnace
ahhh, cool wanted to make sure you had quick help
lone ferry
@elder hare for (int j = COLS - 1; j > 0; j--) { should be for (int j = COLS - 1; j >= 0; j--) {
Probably.
elder hare
@lone ferry still black pixels :/
at the same place*
hmmm
@lone ferry when i changed for (int j = 0; j < COLS; j++) { this to for (int j = 0; j <= COLS; j++) { this the black spots became green
obtuse spruce
i = i + COLS - 1; is wrong ... should be i = i + COLS;
AND
leds[i + COLS - j] = pgm_read_dword(&(bitmap[i + j - 1]));
needs to be
leds[i + COLS - 1 - j] = pgm_read_dword(&(bitmap[i + j - 1]));
ack... wait...
fie - hold on, let me give you a clean version of it all at once
void drawBitmap(const unsigned long* bitmap) {
FastLED.clear();
bool LTR = true; // Flips the image
for (int i = 0; i < NUM_LEDS; i += COLS) {
for (int j = 0; j < COLS; j++) {
int k = LTR ? j : COLS - 1 - j;
leds[i + k] = pgm_read_dword(&(bitmap[i + j]));
}
LTR = !LTR;
}
}
@obtuse spruce there we go 🙂
obtuse spruce
There - I cleaned up several things:
- bump
iin just one place - eliminate the
if, because both branches were very nearly the same - removing repeated code makes code easier. - introduce
kwhich is the only thing that really changes LTR or !LTR: You either go forward or backward on the leds... the rest is the same - used the
?:operator - which forces the code to be clear that the two options are the same kind of thing - we don't want to set an LED in one side of an if and launch kites in the other side - we only want to pick an LED index on either side of the conditional.iflets you do anything on either side,?:constrains the sides to be consistent.
Lastly, this code tried really hard to avoid all the - 1 bits all over the place... they are hard to reason about (I missed several things on my first two attempts to fix the code) - and generally a "code smell" if you have more than one of them in a tight loop like this.
elder hare
would you look at that 🙂 ty for that one @obtuse spruce 🙂
obtuse spruce
most welcome
quartz furnace
Hi mzero are you able to help with an example code written for a STM32 Discovery board: need it to work on a M0 ... need help with pin assignments
obtuse spruce
Sure - I can look - which M0 board is it?
obtuse spruce
got it - what the issue / code?
quartz furnace
What to assign for // #define GPO_PIN PE4
// #define LPD_PIN PE2
// #define SDA_PIN PB11
// #define SCL_PIN PB10
I have no experience using pin names like "PB11" usally just a raw number, I'm sure you have to be careful with Pins that are resets and whatnot
And don;t see an exact match for a PE2
obtuse spruce
yes, those are uncommon - but in the CMSIS (the files from the chip maker) - PB11 and PB10 are defined as "pin" 43 & 42 -- but I don't think those are Arduino Wiring pins, but instead, actual pins
And I can't find PE2 at all --- so I'm assuming that the core header files from the STM32 discovery board defines these -- as Arduino wiring pins. I don't have that core... BUT - it should be easy to find the right values for your Feather M0 board
quartz furnace
Looks like PA22 and PA23 for SDA SCL
obtuse spruce
first, the following will probably work on any board:
#define SDA_PIN PIN_WIRE_SDA
#define SCL_PIN PIN_WIRE_SCL
ok cool
obtuse spruce
those PIN_WIRE_XXX constants are defined to be Arduino Wiring pin numbers --- which each board's core code has tables that map these "pin numbers" to actual pins on the chip - (and ports and bit numbers).
elder hare
hmm i can't use pastebin here?
quartz furnace
I foundout pins 2,4,7,8 look to be all used by the WINC
obtuse spruce
Now - I'm not sure what GPO_PIN and LPD_PIN are used for
elder hare
so this is my main.ino
https://pastebin.com/Bwm71aUG
this is the GalagaBoss image array
https://pastebin.com/Fy3gFsvg
why wont it animate :S maybe im missing some small little detail :/
quartz furnace
Same.. I know when the borad came out they had a demo. .. wonder if they plan to post it
It would be helpful to see a wiring of how they had it hooked up too
north stream
Maybe the UPDATE() method isn't getting called?
obtuse spruce
OH - those are just generic pins used to initialize that st25dv library - they aren't used in that sketch at all.
elder hare
@north stream iforgot myself there xD that was MyFastLEDMatrix.h xD
quartz furnace
ohhhh
elder hare
this is the main.cpp
#include <Arduino.h>
#include <WiFi.h>
#include "MyFastLEDMatrix.h"
#include "MyWifi.h"
#include "MySocket.h"
void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_STA);
WiFi.setSleep(false);
FastLED.setBrightness(64);
FastLEDMatrix->SETUP();
MyWiFi->begin();
MySocket->begin();
}
void loop() {
FastLEDMatrix->UPDATE();
MySocket->loop();
}
and yes it gets called
obtuse spruce
@quartz furnace - at least I don't think they do.... what are you trying to do? Write to a writable NFC tag?
quartz furnace
The demo that was show is you take your phone to this board and you can read it by NFC
shown*
north stream
You may need to make your update time variable a class member
quartz furnace
@obtuse spruce So that leaves it wide open for the pin to use? Just avoid the ones for the WINC chip i.e 2,4,7,8 ?
obtuse spruce
Okay - so - Does your feather have NFC on it? I see WiFi... but not NFC?
elder hare
@north stream they are now class members and it still doesn't animate :/ erh what could be wrong
quartz furnace
@obtuse spruce So I can't use a 328P due to spec limitations.. this is the only M0 borad I have
So the thought was to test it on that board, just not load anything to do with WiFi
obtuse spruce
@elder hare - it doesn't animage because drawAnimation simply draws a the bitmaps on top of each other each time it is called from UPDATE
elder hare
but in the drawBitmap i have FastLED.clear(); that would clear the matrix?
obtuse spruce
@quartz furnace - but I don't think there is any NFC hardware on that feather you are using.
Is your aim to do something with NFC?
obtuse spruce
@elder hare - is your aim, each time UPDATE is called, and it passes the curtime > lasttime check, that it draw one bitmap from the list, and then the next time, draw a different one, etc....
quartz furnace
Seems like it has the NFC in the breakout
elder hare
@obtuse spruce ooooh looking at the serial monitor the ESP32 crashes constantly 😐
@obtuse spruce yes
obtuse spruce
AH - okay, I missed that you have that
quartz furnace
no worries..
elder hare
Rebooting...
ets Jun 8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5828
entry 0x400806ac
[DNS] DNS Adress : esp32Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC : 0x400d182b PS : 0x00060230 A0 : 0x800d68e4 A1 : 0x3ffb1f90
A2 : 0x00000000 A3 : 0xfbb7cffd A4 : 0x3ffc1080 A5 : 0x3ffc1e08
A6 : 0x3ffc1958 A7 : 0x3ffc10e0 A8 : 0x800d182b A9 : 0x3ffb1f70
A10 : 0x0000007d A11 : 0xfbb7cffd A12 : 0x3ffc1e08 A13 : 0x00000005
A14 : 0x3ffc152c A15 : 0x3ffc1e08 SAR : 0x0000000a EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000 LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0xffffffff
Backtrace: 0x400d182b:0x3ffb1f90 0x400d68e1:0x3ffb1fb0 0x40088b7d:0x3ffb1fd0
hmmm :S
Core 1 Panic'ed xD
quartz furnace
Wish I had a regular M0 or M4 @obtuse spruce ... I know it adds a bt of compexity using one with WiFi
obtuse spruce
GOT IT
No, the WiFi isn't an issue
OKAY
So - how have you wired the break out to the board? I'm assuming that SCL and SDA are going to SCL and SDA as marked on the feather, right?
quartz furnace
yep
obtuse spruce
and where did you wire the GPO pin on the breakout?
quartz furnace
Haven't yet.. Got confused by the naming PB11 etc
obtuse spruce
gotcha - well, it is just a logic pin that tells you that some device RF'd with the breakout.... so if you sketch doesn't need it - don't wire it. If you do want then, just pick and unused pin that is both digital and interrupt capable.... which is almost all of them!
How about 5 - that's not used for anything
quartz furnace
cool. okay and the LPD pin? I think that was the name
Yeah, LPD has some assignment ... And cool for pin #5 for GPO
obtuse spruce
I don't see LPD being used AT ALL in the ST25DV library - other than to provide simple functions that are just calls to digitalWrite and digitalRead
It is totally pointless..... So, whoop it up, define it as, er, 0
or better yet, 99 or something absurd
obtuse spruce
@quartz furnace - and I just searched through the library .... turns out it doesn't use the GPO pin either!!! so, no point in wiring it ... but you can if you intend to build your own things
quartz furnace
Cool.. @obtuse spruce I did not know you could use a pin number not on the board
obtuse spruce
well - I'm sure the code will do something HORRIBLE if you ever execute code that uses such a pin.
quartz furnace
@obtuse spruce ahhh cool.. Wish they would have left more in the 'notes' part of the code
obtuse spruce
But - the point is, it isn't going ever get called!
Unless you or some example sketch calls a function called ST25DV_GPO_* or ST25DV_LPD_*
and really - there is no point in calling those - just use pinMode and digitalRead and digitalWrite yourself - will make things clearer anyway!
quartz furnace
@obtuse spruce interesting .. must just need defined to compile
elder hare
ok there we go! it's no longer crashing now i just need to find out what is causing the crash
what i did was this
void loop() {
//FastLEDMatrix->UPDATE();
MySocket->loop();
}
so something inside the FastLEDMatrix class is causing the crash but i dunno what
obtuse spruce
@quartz furnace - yeah, you need to define them to something - any int at all - because the begin call needs them - but all the library does with them is save those two integers away, in case anyone calls those utility functions --- which nothing in the library or example sketches every does!
Basically they've got old legacy code in there and they need to clean it or document that it is there for older sketches (I'm guessing)
quartz furnace
@obtuse spruce Thanks!
lone ferry
@elder hare Your code is trying to read from an illegal address in memory.
north stream
There does seem to be an unnecessary pointer in the class for some reason
scarlet imp
Hi all. I wondering if anyone has ssl (client) working on ethernet ( not wifi ), on a adafruit feather. I'm using the m4 express, I tried modifying the ArduinoBearSLL WIFIsslClient example, which led to trying to get the ECCX08 random number generator example working ( the library is needed for BearSSL ), which led to maybe I need to define the wire that the crypto chip on the M4 uses, and then I got lost in the rabbit hole. Docs say the feather has a crypto chip on it, but no more details. I just want to connect to https. 😕
elder hare
@lone ferry hmmm :S
lone ferry
@elder hare If you comment out the for loop in drawAnimation, and just do drawBitmap(bitmaps[0]); it will probably no longer crash.
elder hare
@lone ferry check this out xD https://pastebin.com/TW3Mjfnv i've commented out almost everything... and it still crashes
lone ferry
But it does draw something?
I don't know if I have all your code but it does seem like you never actually create the FastLEDMatrix instance anywhere.
elder hare
no now it does not draw anything as i have commented out this part in UPDATE()
// Check Strip Array Current Pattern and switch accordingly
/* switch (1){
case 1: drawAnimation(GalagaBoss, GalagaBossSize); break;
case 2: break;
case 3: break;
case 4: break;
default: break;
}*/
But before you commented that out, it did draw something?
elder hare
weirdly yes :S the moment it starts up it starts crashing but it displays an image on the matrix
lone ferry
Where is the line in your code that does FastLEDMatrix = new MyFastLEDMatrix();?
elder hare
all i have is this at the bottom of the pastebin i linked you
MyFastLEDMatrix *FastLEDMatrix;
Well, add the line FastLEDMatrix = new MyFastLEDMatrix(); to setup(), above the call to FastLEDMatrix->SETUP();
elder hare
'FastLEDMatrix' was not declared in this scope
lone ferry
That makes no sense. Maybe you should put the latest versions of all your code files somewhere.
elder hare
huh?
lone ferry
I can't really give you good advice if I don't know exactly what your code looks like.
elder hare
@lone ferry https://github.com/MythicalForce/Prosjekt1 can you see this git?
lone ferry
yup
The problem is that you call FastLEDMatrix->UPDATE() but the variable FastLEDMatrix has some random value in it.
So you need to write FastLEDMatrix = new MyFastLEDMatrix(); first, in your setup().
elder hare
aaaand that fixed it :S
weird that it worke this time :S
i feel the error stuff in Visual Studio is weird :S
lone ferry
Well, you need to do everything exactly right in C++ or it won't work. 😉
elder hare
okey now that it does not crash! the image is still not animating
lone ferry
But it does show an image, right?
elder hare
yupp 🙂
lone ferry
You need to put some kind of delay in the for-loop that does the animation or it will go way too fast.
elder hare
hmm still nothing :S
lone ferry
How big is your delay?
elder hare
500
lone ferry
Where did you put it?
elder hare
void drawAnimation(const unsigned long** bitmaps, int s) {
for (int i = 0; i < s; i++) {
drawBitmap(bitmaps[i]);
delay(500);
}
}
I guess you need to put a FastLED.show(); right after that delay.
Anyway, GTG. Good luck 🙂
elder hare
okey it worked now
but sad that i have to use delay() :S
@north stream why MUST i have delay? why can't i use the millis? :S
north stream
You can use millis unless something is interfering with the timer/interrupt
elder hare
it should work as this
#ifndef MYFASTLEDMATRIX_H
#define MYFASTLEDMATRIX_H
#define FASTLED_INTERNAL
#include <FastLED.h>
#include <pgmspace.h>
#include "bitmaps/digdug.h"
#include "bitmaps/frogger.h"
#include "bitmaps/galaga.h"
#include "bitmaps/pacman.h"
#include "bitmaps/smb.h"
#include "bitmaps/qbert.h"
#define LED_TYPE WS2812B
#define DATA_PIN 23
#define COLOR_ORDER GRB
#define NUM_LEDS 256
#define COLS 16
#define BRIGHTNESS 16
CRGB leds[NUM_LEDS];
//====================================================================================================================== //
// CLASS - MY FASTLED MATRIX
//====================================================================================================================== //
class MyFastLEDMatrix {
public:
unsigned long lastUpdate = 0;
int Delay = 255;
void drawBitmap(const unsigned long* bitmap) {
FastLED.clear();
bool LTR = true; // Flips the image
for (int i = 0; i < NUM_LEDS; i += COLS) {
for (int j = 0; j < COLS; j++) {
int k = LTR ? j : COLS - 1 - j;
leds[i + k] = pgm_read_dword(&(bitmap[i + j]));
}
LTR = !LTR;
}
}
void drawAnimation(const unsigned long** bitmaps, int s) {
for (int i = 0; i < s; i++) {
drawBitmap(bitmaps[i]);
FastLED.show();
}
}
void UPDATE() {
unsigned long curtime = millis();
if (curtime > lastUpdate) { lastUpdate = curtime + Delay;
switch (1){
case 1: drawAnimation(SMBMario, SMBMarioSize); break;
case 2: break;
case 3: break;
case 4: break;
default: break;
}
FastLED.show();
}
}
};
MyFastLEDMatrix *FastLEDMatrix;
#endif
@north stream right?
north stream
As both matthijs and I pointed out, that declaration isn't correct.
elder hare
what declaration?
north stream
MyFastLEDMatrix *FastLEDMatrix;
i have this in setup aswell
FastLEDMatrix = new MyFastLEDMatrix();
Then you can delete the other one.
You'll still need a declaration somewhere, I suppose.
elder hare
yea cause if i delete the other i get
identifier "FastLEDMatrix" is undefined
how what when?
obtuse spruce
So - a common way to deal with singleton classes is just statically declare one. So long as you don't use anything "complex" in the constructor, you're fine, and in generally it makes things much easier.
In this case, just do this in the header file:
Class MyFastLEDMatrix {
...
};
and in the .ino file, the one place where it is used, do this:
MyFastLEDMatrix theMatrix;
...
void loop() {
...
theMatrix.UPDATE();
}
If you want to use theMatrix from multiple different code files... that is possible also:
In the .h file do this:
...
extern MyFastLEDMatrix theMatrix;
Then create a MyFastLEDMatrix.cpp file that has:
#include "MyFastLEDMatrix.h"
MyFastLEDMatrix theMatrix;
And lastly, in each file that needs to use theMatrix:
#include "MyFastLEDMatrix.h"
...
void someFunction() {
...
theMatrix.SomeFunction();
...
}
hard forge
Hi all, I'm looking for help implementing the Arduino BLE library to create a peripheral device that multiple centrals can read from. I've covered my bike in NeoPixels with Arduino Nano 33 IOTs in each of the wheels, and a third Nano 33 IOT on the bike frame switching between animation modes with a NumberPad controller. I thought I would be able to make the nano on a Peripheral and "serve" the mode to the other two nanos in the wheels.
My questions are:
- Is this possible?
- Is there a better way using different hardware?
- Do you know of an example of how to set this up?
Any thoughts would be appreciated! Thank you! My code and project info is here: https://technochic.net/blogs/technochic-diy-projects/neopixel-bike-lights
obtuse spruce
I don't know any particulars about doing BLE on an Arduino, but in the face of it, it seems unlikely that a single device can server multiple centrals easily. Why not do it the other way around, having the spokes be the peripherals to the frame as central?
hard forge
Thanks! I did try the other way around, and I've been able to send the "mode" from the central to the peripheral, but I don't know how to connect a second peripheral at the same time. 🤔
So the root of my question is: Does anyone know how (or know of an example or project) to use BLE to share a piece of data wirelessly between 3 Arduino's?
ivory gorge
I’ve only ever seen Lora used for that tbh, I can’t say I have experience with ble hardware like that. That said, how much latency can you put up with?
Might it be possible to switch between modes to keep them all communicating with each other
hard forge
For now, I'd take a few seconds lag if I could get it to work. 🙂
ivory gorge
Aight
If it’s possible to get the devices to flipflop between central and peripheral modes I would consider that as a workaround unless you’re trying to do like, synced animations
hard forge
That's interesting. Like daisy chaining the communication rather than broadcasting.
hard forge
Honestly, I started the project wanting to learn more about BLE- but now I'm SO OVER that- haha. I didn't think of Wifi - I assume they can create their own network?
stone dirge
Can anyone help me out with my esp8266-01? I am trying to control a LED through adafruit IO. I am using the adafruit digital_out example code and the device is connected and receiving data, but the LED is not responding.
15:48:30.748 -> Adafruit IO connected. 15:48:30.889 -> received <- LOW 15:48:32.505 -> received <- HIGH 15:48:34.454 -> received <- LOW 15:57:55.157 -> received <- HIGH 15:57:58.310 -> received <- LOW
I have pin 3 (GPIO 0) active in the code and the LED is connected to pin 3
ivory gorge
They use a different chipset than I’m used to so they might not offer the ability to create an AP, but if they can you could do it that way, or potentially set up a WiFi direct / ad hoc group
That said, the webpage says they can be both ble host and client, so hmmmmmm
hard forge
Right that's why I was excited about the nano IOT - I had originally wanted to go with Adafruit Feathers but they didn't have the ability to be a "Peripheral / Server" and I didn't want to have to use my phone as a controller. It's an interesting thought tho - to create a wifi network between them instead. I'll look into that and maybe I'll leave my learning about BLE to another project. 🙂
ivory gorge
Aye, wish I could be of more assistance, I’ve mostly stuck to the wired things :)
hard forge
Thanks for your help! Me too... wires are so ... trustworthy. 😎
ivory gorge
They just don’t do well when you wrap them around bike wheels and go for a ride, that’s for sure!
hard forge
Haha no...
ivory gorge
Oh wait
You don’t have three 33s?
You have a 33 and two feathers?
Your 33 needs to be set up as the peripheral
The feather wings will be the centrals
hard forge
Right now all 3 are Arduino Nano 33 IOTs
hard forge
Yeah I
ivory gorge
I glanced at the project link you posted and it said you had the feather wings in the wheels
hard forge
ve been reading that document over and over for weeks haha
Oh! That was the original plan. And then I started to learn 2 different BLE libraries and my brain started to explode :p
But switching to the Nanos didn't make it much better haha
ivory gorge
There’s a lot of links on the right side of that page for how to use the code, with lots of examples; the document gives an overview of how things work and the code should help clarify?
hard forge
Right, unfortunately, I'm learning as I go, and the examples say what to do but not why and when, so I've struggled with it. My best try code is listed at the bottom of my blog post (although it's a bit long because it includes the neopixel animations too)
ivory gorge
Fair enough!
This looks like it has lots of good example code as well
If I had the ble version of the iot nano I would do some testing for you but I have the Lora versions >_>
hard forge
I dont' know Lora - should I look into it for this project?
ivory gorge
Here is the reference for the WiFi library in case it looks like it may be easier for you https://www.arduino.cc/en/Reference/WiFiNINA
Your current devices should work alright, to be honest
Lora is for long range / low [data] rate, so trying to stream audio reactive animations in real-time over Lora is gonna give you more headaches than doing it with ble
hard forge
Gotcha. Yes I just need to send data a few feet. Thanks for the help 🙂
north stream
I might split the difference and use ordinary RFM69 type radios and the RadioHead library (BLE has its own headaches)
Or for just a few feet, your original WiFi idea might be the right one
hard forge
Ah... I was just reading about that yesterday. Something seemed out of date tho - was it discontinued?
north stream
The RFM69 chips or the library?
hard forge
The library
ivory gorge
https://forum.arduino.cc/index.php?topic=674281.0 here is a thread where someone explained how to have multiple clients connecting btw, might be useful
hard forge
Oh wow that looks very helpful. Thank you!
north stream
Even if Mike McCauley's original RadioHead library isn't maintained (I hadn't heard anything), Paul Stroffregen (of PJRC/Teensy fame) has a fork of it, and SparkFun has their own fork as well.
It's a pretty solid and expansive library, even if no one else were maintaining it, I'd probably keep using it, as it serves my purposes nicely.
hard forge
Ok thanks! I'll look into it. At this point any radio communication to the wheels that works will be AMAZING. Thank you!
reef ravine
still no luck @stone dirge ?
clear fog
afternoon! I was wondering if its possible to count the number of Bluetooth devices I have passed using a GEMMA M0 and log it to a string
I know my question is broad but I'm hoping to be point in the right direction with this idea 🙂
stuck coral
It is if you have a bluetooth chipset that can return advertisments which is basically all of them
but remember peoples MACs change constantly, so its not terribly great for tracking if that was a goal
clear fog
the basic idea is if I go into town for the day, I wanted to get a rough number of people I passed
Don't need to be able to track the devices again in the future
stuck coral
You could probably graph a rough relative measurement, youll stumble on many many devices around you that have bluetooth but are not a cell phone
clear fog
is there anyway to filter them out?
stuck coral
Its possible phones typically have a part of their advertisment different, Im not too sure if they set their advertising payload for some extra function you could base the scanner off of
I think itll probably just be a list of random MACs is all you get
clear fog
I see
well that is a start
any good resources on writing code to do this kind of thing?
stuck coral
Most of the time its specific to the BT chipset, make sure you dont get one of those popular BT Serial modules. Not really sure of a solid recommendation for an external chipset that is good with arduino
clear fog
I have a bluno beetle, what about that?
stuck coral
Hm maybe, it uses serial like the modules but now that I think of it a part of BLE 4.0 GATT should be its required to return you the advertisment data so you'd have to check the AT commands for that device
clear fog
@stuck coral thanks for the info, does adafruit have a board that would be best for this?
I like using Adafruit stuff as it has very good documentation
stuck coral
I love the nRF52 and they have a few boards if I remember right
That will certainly do the job, I just havnt used the Arduino framework with it
clear fog
those are big though right?
stuck coral
I mean, I think they have a feather with a nRF52 on it, but the nRF52 itself can be quite tiny
clear fog
thanks, I'll check it out
@stuck coral What is wrong with BT Serial modules like the HC-05 and HC-06
you said not to use them
@stuck coral Do all smartphones send out advertisements? as long as bluetooth is on?
stuck coral
They tend to be limited from what I see, but they might have an AT command to get the advertising data.
And yeah, pretty sure they always send advertisments but I could be mistaken, i see when my neighbors get home if I have my scanner open
clear fog
Thanks! I would really appreciate that. 😄
neat kayak
hey im completely lost when it comes to batteries. If I wanted to power an arduino nano and a 12v water pump with a battery, what battery should I go with for it to last a while. I was thinking something like this https://www.banggood.com/12V-8-x-AA-Battery-Clip-Slot-Holder-Stack-Box-Case-6-Inch-Leads-Wire-p-80721.html?cur_warehouse=CN&rmmds=search and then using a 12v to 5v step down to power the arduino. I have no idea if this would work cuz I have never used batteries before. Any help would be greatly appreciated.
ivory gorge
Pumps draw a lot of power, define “last awhile”
neat kayak
I want it to last a few days, but I am only turning on the pump for less than 2 seconds at a time every so often
its more of a mist sprayer than a continuous water pump
ivory gorge
On for a second and off for a second? Off for an hour?
You might be better off buying some actual 6v or 12v batteries
Instead of AAs
neat kayak
it would be on for a second then off for something like an hour. I would prefer for the batteries to be replicable in something like this battery pack if possible
or i guess rechargeable would work too
would something like this work better?
vivid rock
I would certainly use 8 cell NiMH rechargeable or 3cell LiPo (nominal voltage 11.1v) instead of AA.
And you do not need a voltage converter - nano has one on board. Typically you can power nano using up to 20 v
neat kayak
oh great
i guess ill go with the 8 cell nimh and see how it goes
thanks for all the help 🙂
vivid rock
Of course there are many different nano boards - double-check the specs for yours
neat kayak
yea i will for sure
storm harness
Is there a way i can multiply two integers as if they were floats in the range 0-1. For example 65535 * 32767 = 32767
platform is teensy 4
lone ferry
Yes, but you need to do this in 32-bit and divide by 65535 afterwards. (Or rather, shift right by 16.)
elder hare
@obtuse spruce i just did what you told me yesterday
im still getting weird errors :S
even tho i have this function
void drawAnimation(const unsigned long** bitmaps, int s) {
for (int i = 0; i < s; i++) {
drawBitmap(bitmaps[i]);
FastLED.show();
}
}
inside the main UPDATE() function that runs in the main loop
void UPDATE() {
unsigned long curtime = millis();
if (curtime > lastUpdate) { lastUpdate = curtime + Delay;
switch (1){
case 1: drawAnimation(SMBMario, SMBMarioSize); break;
case 2: break;
case 3: break;
case 4: break;
default: break;
}
FastLED.show();
}
}
as with the original code you had to have a delay() inside the drawAnimation for loop to make it animate to make it work if not it would just stand still so i figure the problem is in
void drawAnimation(const unsigned long** bitmaps, int s) {
for (int i = 0; i < s; i++) {
drawBitmap(bitmaps[i]);
FastLED.show();
}
}
in the for loop! even tho i have the millis in place the for loop just rams through the "animation" so fast that you dont see it
am i wrong?
lone ferry
What is wrong is that your drawAnimation tries to run the entire animation, but it should only show the next frame of the animation. The next time it is called, it should show the frame after that, and so on.
elder hare
question, how would i solve this? WITHOUT using delay()! need millis
lone ferry
drawAnimation(SMBMario, SMBMarioSize, step); where step is a global variable that you update.
void drawAnimation(const unsigned long** bitmaps, int size) {
drawBitmap(bitmaps[step]);
step += 1;
if (step >= size) { step = 0; }
}
Actually I didn't use step as a parameter there, it should be a global.
Put int step = 0; somewhere outside your functions.
elder hare
i did hmm
on this
drawAnimation(SMBMario, SMBMarioSize, step);
i get
too many arguments in function call
Yeah I changed my mind about that one, you don't need it.
safe halo
I have a c++ uint8_t *payload
that I am trying to iterate thru by using a
char license[20];
for (size_t i = 1; i < (sizeof(payload) + 1); i++)
{
Serial_Debug.println((char)payload[i]);
license[i] = (char)payload[i];
}
Serial_Debug.println(license);
but no matter how long the array is it always comes back as 4...
the Payload in this instance is "SWDFE"
In the Serial Monitor it receives the data but I cant get past a count of 4
@SWDFE
S
W
D
F
#SWDF␌␆
You can't use sizeof() to get the size of an array like that.
safe halo
You can't use
sizeof()to get the size of an array like that.
@lone ferry It always comes back as 4
lone ferry
C arrays don't actually store their size anywhere.
What you're getting here is the size of the pointer, which is 4 bytes.
north stream
You can usefully call sizeof() on a fixed array, but not a pointer like that.