#general-tech

1 messages · Page 145 of 1

lethal valve
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Cool

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What details would you need?

harsh void
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It can have big output capacitance

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And create spikes

lethal valve
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But for hobby use you wouldn't need to worry about those?

harsh void
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Basically you can perform an "LED" test where you limit current to 10mA and voltage to maximum

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Connect led when it's off and switch it on

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If the LED is alive and it shows 10mA and correct voltage drop on LED - it's ok

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If LED dies - it's trash

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You can learn more by searching about power supplies on yt

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Usually low cost Chinese ones like this are pretty bad

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Especially when they are as this - switching mode power supplies

lethal valve
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Im pretty sure it's linear

harsh void
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Then why they add some crappy images

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Linear power supply has usually big transformer inside

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And they are quite heavy

steady kite
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I remember when i told my dad about switching power supplies the 1st time

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he could not comprehend the idea.

harsh void
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I mean they are cool

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But only when made well

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Microprocessor based ones are quite ok

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But still depends

steady kite
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he was under the impression you always need a transformer

lethal valve
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imagining a microwave transformer in one of these

steady kite
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that's over kill madness

harsh void
lethal valve
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200kv output

harsh void
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Anyway - for me it looks a bit sketchy

lethal valve
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you need to hook it up directly to a power line

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xd

harsh void
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You can buy it and I'm sure it will have spikes when switching

lethal valve
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It's alright just for basic stuffz

harsh void
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Just don't switch it when something is connected

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And you should be fine

steady kite
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@harsh void he thought you would need a massive transformer to just switch between 220 and 110

lethal valve
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me?

steady kite
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my dad

lethal valve
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oh lol

harsh void
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Lmao

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For now I have this thing:

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Got it for cheap

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It's big, heavy and linear

lethal valve
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wth is this

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looks dodgy

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2kv output

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looks like a hospital bin

harsh void
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And it's only 5A

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So that you have linked must be switching type

lethal valve
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Ok thanksz

harsh void
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I'm just warning you about power on spike

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Because it can fry up stuff

lethal valve
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I actually have one of these units at my workplace

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we use them to charge batteries

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for like 5 yrs

harsh void
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Ah for batteries it's not a big deal

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They don't care lol

lethal valve
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the ripple is low

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lol

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i think we also have a ups system made out of super capacitors

harsh void
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What

lethal valve
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what

harsh void
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That would be massive and expensive

lethal valve
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it was for like small things

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like raspberry pi(s) lol

harsh void
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Maybe makes sense

violet torrent
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Morning everyone

lethal valve
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good afternoon

lethal valve
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does anyone know where i can buy a raspberry pi zero 2 lol everywhere is out of stock!

harsh void
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Because of production problems

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Lol

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We actually have plenty of them in my country

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Like 400 on one shop

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Interesting

lethal valve
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I guess your european?

harsh void
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Yeah

lethal valve
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What shop? cool

harsh void
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Botland

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It's not that cheap shop tho

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We also have 2 popular sites where everyone can sell stuff and there is a lot of interesting things

lethal valve
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i know but atleast it's in stock!

harsh void
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Some time ago I bought 10x ATtiny10

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Now I can't find them anywhere

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Only in China for like 10x the price

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Or more

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Pretty bad times for electronics

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Everything is in small amounts and pretty expensive

lethal valve
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Yeah

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Including chip shortages : (

spark cliff
lethal valve
harsh void
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I was surprised when I ordered from china and it was like 3 weeks and quite cheap

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Free delivery

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But usually it's not worth

uncut summit
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So with Visual Studio Code and both PlatformIO and ESP-IDF I can now program all the ESP8266/ESP32/ESP32-S2/ESP32-S3 boards including the latest from Espressif S3 boards that are on Adafruit site. Learning the ESP-IDF framework was a bit of a challenge.

normal helm
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I need help

cold pebble
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@Exbountyhunter#5467 Best to ask your specific question, different people have different knowledge (please don't cross-post in multiple channels)

uncut summit
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tip: if you have a qt-py and a seeduino expansion put a piece of tape on the bottom of the qt-py to cover the 5v/GND/c-r-d pads because if you plug into the expansion the 5v will connect to the seeduino debug pin and cause power drop resulting in board put into safe mode.

ornate egret
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hi

uncut summit
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yo

swift pendant
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anyone here can link me to some online video or documentation that simplifies how ram, address memory and registers work?

swift pendant
uncut summit
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what sort of help you looking for

hearty karma
uncut summit
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yes those are really good

swift pendant
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and i read that the time it takes for a cycle has increased over the years, but i dont understand what this really means

hearty karma
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Earlier CPUs tended to take several clocks to process an instruction, but more recent ("RISC") CPUs can process an instruction per clock. However, many of them use a "pipelined" execution model, where the various phases of processing are all happening at once, so the CPU will be finishing one instruction at the same time it's starting another, or in some cases, several will be in-process at once.

uncut summit
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There are two types of CPU's CISC and RISC, CISC stands for complex instruction set, and RISC stands for reduced instruction set. In a intel CPU for example it has a series of instructions it can perform such as move or copy or load, there are more than 100 of these instructions and these instructions can take different amount of clock cycles to complete. In a RISC they simplify the instructions so that they take same amount of clock cycles to do each instruction but it takes more of them to complete the same job. In modern CPU's there is pipelining and other features to optimize the flow of instructions that the CPU will perform. When learning this it's best to look at old simple CPU's like a 6502 or a Z80. A 6502 has only 56 instructions and is easy to learn.

verbal aspen
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Just to be pedantic, RISC instructions can take different numbers of clock cycles too.

uncut summit
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no fixed

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@hearty karma is right usually one instruction per clock

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Back in the 80's when Intel came out with the 8088 4.7 Mhz cpu another company came out with the NEC V20 clone but NEC optimized their cpu to shave off clock cycles for the instructions thus their cpu behaved like it was abount 20% faster

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1981 4.7Mhz 2022 5Ghz

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how far we have come

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original 6502 1 Mhz

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6502 could address 64K ram only

gloomy mango
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I really should buy parts for my 8086...

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Saying that, I should build my Z80s first.

hearty karma
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I'm breadboarding an 1802, and vaguely considering trying to breadboard an 8008 (a CPU in an 18-pin DIP is amusing, the odd MC14500 1-bit CPU fits in a 16-pin DIP).

static yarrow
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does anyone know any good starting point for esp8266 with arduino ide ??

I am interested in the WiFi stuff the board offers (I am pretty familiar with the non wifi stuff)

I want to know if there is a youtube playlist or a pdf or website that teaches you esp8266 wifi ??

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I am currently reading the docs of ESP8266WiFi.h library which do give some overview of concept
but are there some other resources that i could use ??

cloud walrus
static yarrow
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If you have anything more , just ping me

cloud walrus
static yarrow
static yarrow
cloud walrus
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You're welcome -- Have fun!

pine igloo
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What's the name of the component that requires a minimum voltage for it to allow current to flow?

violet torrent
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transistor?

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Also, I love how just a week or so ago a video was posted using the Pico to drive a floppy disc, and I just got my hands on an IDE floppy drive and was thinking of doing the same thing

pine igloo
# violet torrent transistor?

Yes, but which one exactly? I need one that doesn't just amplify, say, 0.1-0.6v. It needs to amplify none of it or all of it.

delicate quarry
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There are many types of transistors, sure, but they have less to do with amplification and more to do with configuration.

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Unless there’s more context to this I’m not aware of?

hearty karma
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You could be describing a transistor in some sense, they don't really start to conduct until you reach the threshold voltage (FETs) or forward drop (BJTs). But if you want to switch from "fully off" to "fully on" at a specific voltage, you might look at a component known as a "comparator".

pine igloo
pine igloo
delicate quarry
hearty karma
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Solar lamps typically contain a little integrated circuit (such as YX8018) that manages charging/discharging. Doing it yourself trying to avoid charging/discharging at the wrong time can be tricky, as you're working with low voltages and low currents, and there are lots of stray effects to avoid.

pine igloo
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Alright, thanks guys.

civic pewter
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Hey guys! My son wants to get a Circuit Playground (8yr old, loves scratch and code.org) and I was wondering should I get him the Playground Express or the Bluetooth (since BTLE isnt compatible w/ MakeCode) ?

cloud walrus
hearty karma
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You can also use the CPX with Scratch. https://blog.adafruit.com/2020/01/14/a-scratch-3-extension-for-the-circuit-playground-express-circuitplaygroundexpress-scratch-programming/

Adafruit Industries - Makers, hackers, artists, designers and engineers!
A Scratch 3 extension for the Circuit Playground Express #CircuitPl...

Alan Yorinks posts on Twitter availability of a Scratch 3 language extension for the Adafruit Circuit Playground Express microcontroller board. I’ve just released a #Scratch3 extension for th…

cloud walrus
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I expect the CPX will be fine for a long time at that age. I was thinking more if Dad wanted to play with it as well 😉

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I would recommend the CircutPlayground Express over the CIrcuitPlayground "Classic"

minor crag
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hey everyone

minor crag
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I am looking at some micro controllers trying to find one to work for general purpose projects

cold pebble
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Arduino? CircuitPython? Do you need wifi? BLE? lots of flash for images or audio? lots of RAM for large programs or large data? Lots of pins?

minor crag
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the flexibility to use arduino or circuitpython or micropython is good.. and while I can't envision a project requiring wifi, I may find it useful later.. lots of pins is good

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eventually, I'd like to make a chip flasher out of one, but that's a specific use case requiring the number of pins the arduino mega offers, and I can buy a board specific for that.. so a decent amount of pins is good, but something like a Seeeduino Xiao has too few

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I basically see RP2040, ATSAMD21, ATSAMD51, and ESP32-S2 stuff being the most common

cold pebble
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Arduino/Metro form factor gives lots of pins, available with various processors. Feather form factor has many processor choices, and a lot of stackable peripheral boards. Itsy Butsy and QT Py form factors are great for small stuff.

minor crag
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whats the advantage of the feather form factor besides being able to fit it in more stuff?

cold pebble
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Those are all good options, although I'd shy away from SAMD21 unless you know your applicatiosn will be limited and will fit in RAM (less of an issue with Arduino IDE)

minor crag
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yeah, I had to use a Seeeduino Xiao for something recently, and found a lot of scripts had a hard time compiling for it, it's SAMD21

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so something that's going to be fairly compatible with scripts and examples I can find and build from

cold pebble
minor crag
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you say SAMD21 has issues with that.. so bump that off the list.. RP2040, ESP32-S2, and SAMD51

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what I can stack on a feather doesn't seem relevant, since I am looking for something to use just for testing and experimenting

cold pebble
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SAMD51 is very mature and popular. ESP32-S2 has wifi and a lot of RAM. RP2040 is a good processor, very available.

minor crag
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is there an advantage to the Metro form factor?.. more pins maybe? other features/

cold pebble
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not sure about Arduino support for RP2040

haughty flare
# minor crag whats the advantage of the feather form factor besides being able to fit it in m...

my opinion: its small size but high number of gpio pins, built in leds, and stemma connector coupled with a built in charger make this an ideal choice for many projects where space is a premium but functions are many. couple it with a 5v booster and you have a decent platform for just about any project. i suggest the rp2040 as you can program stuff on it and transfer the code to another device with minor tweeks

cold pebble
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Metro has more pins and there are shields to match, and depending on the board maybe additional features there isn't room for on smaller processors

minor crag
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space won't be an issue, since I'm looking for something to test code out on that will likely be ported to other, smaller, more purpose built devices or maybe even at some point to individual ICs

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preferably not micro USB though.. I mean, it is 2022 already right?

cold pebble
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there's an adapter for that 😉

minor crag
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it seems RP2040 or ESP32-S2 is the way to go

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i should mention it's going to be so testing centric that I may even put screw terminals on it

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something to go to when I have those "I wonder if I can do that with an arduino" moments

steady gulch
haughty flare
# minor crag is there an advantage to the Metro form factor?.. more pins maybe? other featur...

the metro is nice. while i havent programmed or anything on it yet, the number of pins is higher than the feather but the board is 3 times as big for 2 extra analog pins and a few extra features. but if space isnt an issue, the metro m4 is a good choice and it features 5v support but lacks charging capabilities and a stemma port, bu a proto and a powerboost shield solve that issue

minor crag
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yeah.. I'd prefer a board with no headers soldered on so I can add those to it straight up, no feather necessary

steady gulch
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there's a featherwing for everything 😉 (ok probably not, but there's a few)

cold pebble
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there's a Metro terminal block shield too

minor crag
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no RP2040 on a metro sized device?

cold pebble
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yeah, battery is a useful consideration

haughty flare
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i do believe there is a board with screw terminalt for the metro and one for the feather

cold pebble
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not yet, "coming soon" I think (RP2040 Metro) ...or at least in some stage of prototype, no guarantee of product)

minor crag
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hmm

haughty flare
minor crag
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wifi excluded, is there any notable benefits to either the RP2040 or ESP32-S2 over the other?

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or for that matter the SAMD51

cold pebble
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most ESP32-S2 boards have 2MB RAM

haughty flare
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for me its the code. so far i know html, gcode, and circuit python coding, only one f which is any use here

cold pebble
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RP2040 has 264k RAM, SAMD51 has either 192k or 256k depending on board

cloud walrus
cold pebble
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QT Py and Itsy Bitsy will also be w/o headrs

minor crag
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well, I have a desoldering gun so... there's that option

cold pebble
minor crag
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also, what's the ESP32-S3 stuff I see listed?

haughty flare
# minor crag well, I have a desoldering gun so... there's that option

https://www.adafruit.com/category/17 this givs you a proto board and screw terminals all without having to remove the headers from a feather, which will allow you to have what you want and keep stackability

Arduino Products Category on Adafruit Industries

Adafruit Industries, Unique & fun DIY electronics and kits : Arduino - Tools Gift Certificates Arduino Cables Sensors LEDs Books Breakout Boards Power EL Wire/Tape/Panel Components & Parts LCDs & Displays Wearables Prototyping Raspberry Pi Wireless Young Engineers 3D printing NeoPixels Kits & Projects Robotics & CNC Accessories Cosplay/Costuming...

cold pebble
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Adafruit learn guide pages for RP2040 say "At the time of launch, there is no Arduino core support for this board. There is great C/C++ support, an official MicroPython port, and a CircuitPython port!" ...not sure if that's current info.

cloud walrus
cold pebble
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@minor cragESP32-S3 is basically alpha at this point, and hard to come by other than manufacturer dev boards

haughty flare
cloud walrus
cold pebble
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and a SAMD51 to round things out 🙂

cloud walrus
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yes! Always nice to have options.

minor crag
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so will the ESP32-S3 surpass the others at some point?

cold pebble
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each of these processors has its pros and cons, all depends on the intended applications

minor crag
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hmm.. I actually have an RP2040 I bought recently.. forgot I had it

cloud walrus
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The S2 does not have BLE. That is a nice addition in the S3

haughty flare
minor crag
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I do plan on designing some peripherals and mods for older video game consoles

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bluetooth may become useful to have at some point

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maybe 2.4ghz as well, but I doubt the wifi chip could be configured to do that

haughty flare
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i have a bluetooth shield for the metro. havent used it yet, but its nice that it comes with a built in proto

cloud walrus
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but as noted S3 support is new and evolving fast.

minor crag
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I'm seeing so much stuff for the Pi Pico, more so than ESP-32

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I notice there's like five UART outputs on the Pi Pico... I almost considered using one to power my 3D printer

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maybe I'll focus on the RP2040 because I see it in a large variety of different types of boards already.. even including tiny ones like the Seeeduino Xiao, I have some projects that use the Seeeduino Xiao, so this would offer an easy path to upgrading that stuff... wifi and bluetooth support can be added later if I need it

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what do you think?.. 3D print a case for that and good to go?

unknown.png
steady gulch
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RP2040 boards are a good way to start because of the price too

minor crag
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I think that's why I have one.. I seen it was like $7 and added it to my cart when I bnought other stuff

steady gulch
minor crag
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I'm trying to think what the advantage is using screw terminals besides being able to use stranded wire without having to solder it first... although it may be cheap header wires, but I find they tend to pull off of pin terminals a lot and if you end up with a lot of wires, or move it around too much, some of it can come out

main hemlock
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which guide says no support? Or is it the product page?

cold pebble
main hemlock
haughty flare
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im looking for a source for flat cathode rat screens

verbal aspen
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What do you mean by "flat"? They won't be thin like an LCD panel.

hearty karma
haughty flare
haughty flare
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ill even take one that requires a mirror

hearty karma
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These have the gun sticking out the side instead. Horizontal deflection is magnetic, vertical deflection is electrostatic. Since you're viewing the phosphor from the side the beam impinges on it, you get a bright sharp picture.

haughty flare
hearty karma
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Yes, CRT is an acronym for "cathode ray tube". The "cathode rays" are in fact an electron beam, which emanates from an "electron gun", with a heated cathode, intensity grid, and additional grids for focus, acceleration, astigmatism control, etc.

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I made this picture of an electron beam a while back. The gun is at the left, and the beam projects off to the right. It's in an atmosphere of rarified helium, which makes the beam visible.

deflect-none.jpeg
karmic obsidian
fast crater
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Hello everyone 🙂
Just wanted to say I totally love Adafruit GFX library as a base to write my own display drivers.

I think it's one of the best things we embedded developers ever got.

Here is my little project I have done on ESP32 😄

https://www.youtube.com/watch?v=v5P81D6qujs

YouTube
sorek
Gauge.S for BMW E36 - features & installation video

Available for purchase now on eBay!
https://www.ebay.co.uk/itm/255232715908

Check out Pamo's video about interface:
https://www.youtube.com/watch?v=IFhzeFEhuas

All info about Gauge.S, files and other documents can be found on GitHub:
https://github.com/handmade0octopus/gauge.s-sorek.uk

00:00:00 Intro

00:01:12 Features

00:07:00 Installation
...

▶ Play video
pulsar shale
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Space telescope? It looks like a drum kit.

pine igloo
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Hi! tried to find what channel to ask this in, so hope this fits?

I've just remembered about adafruit wanting to release their own better rasberry pi pico and also all the streams and development scott used to livestream, looking at it now, the last videos and mentions of anything of that are right where I left off nearly a year ago?

what happened to the eventual release of adafruits own board and did scott and adafruit shift their interest from the board? can someone more deep into all this give me a rundown? thanks!

cold pebble
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adafruit has several RP-2040-based boards: Feather, QT Py, I believe Itsy Bitsy in development

pine igloo
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ah so feather is what I was talking about then maybe?

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looks to be roughly the same form factor and has the labels on the top that were mentioned in brainstorming

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neat that looks definitely like that's it, thanks! though what happened to the development streams and updates about RP2040, was it really over after the ones 10ish months ago?

cold pebble
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metro also in development I believe (no production guarantees on dev stuff leeked by ladyada and crew)

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well, the software is released, the hardware is released, not sure what else there is

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Scott also worked quite a lot on CircuitPython on bare metal Raspberry Pi, which is now released (early alpha I guess you'd call it?)

pine igloo
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I guess that makes sense, just remembered there was so much "soon coming" when I left off, but might be just false memory then..

pine igloo
cold pebble
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yup, install CircuitPython image on SD card, and it boots right into CircuitPython just like any other board 🙂

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and can drive an HDMI display

pine igloo
cold pebble
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it's still very much in development, some features / modules not in there, some quirks, needs more eyes on it to find and fix issues

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displayio on HDMI is pretty cool... I had a script continually generating new graphic objects for a day or so, got to several hundred thousand. Nice to have so much storage and RAM.

junior pivot
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And the QT Py RP2040 is, if you don't need many pins, a very small form factor.

junior pivot
cold pebble
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that was referring to bare metal CP on Raspberry Pi

junior pivot
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Ah

cold pebble
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(not RP2040)

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@junior pivot thanks for the Itsy Bitsy correction, so much cool stuff has come out (and more soon), I've had my tunnel vision blinders on

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watches shop for QT Py ESP32-S2 with u.FL connector

pine igloo
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I'm a little lost, what's the difference between a feather and itsy bitsy? just size and not having the battery connector?

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basically what would make one buy the bitsy over the feather, which is just $2 more?

junior pivot
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"Feather" and "Itsy Bitsy" and "QT Py" are form factors, i.e., a basic PCB size, which usually also includes compatibility with a given pinout. So a Feather or Itsy Bitsy are a certain size of board but may use an ATSAMD21, an ATSAMD51, an ESP32, an RP2040, an STM32, or some other microcontroller CPU as its brains. For example, I was previously using an Itsy Bitsy M4 Express, which has an ATSAMD51, so I was programming it in C/C++. I was able to pull that out of its socket, install an Itsy Bitsy RP2040 onto which I've loaded MicroPython, and didn't have to make any changes to hardware at all.

outer brook
junior pivot
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That's my Itsy Bitsy RP2040 on my robot, which replaced the previous M4 Express.

junior pivot
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If space is a premium and you don't need many pins, the QT Py RP2040 is a great small board. Really tiny. Then the Itsy Bitsy, then the Feather, then the RPi Pico, in size.

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Another of the nice things about the Adafruit, Pimoroni and other maker RP2040 boards is that they usually have an RGB LED on board.

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I use that RGB LED as a status indicator, very handy.

pine igloo
pine igloo
junior pivot
# pine igloo ahh compatibility with existing projects, makes sense!

Yes, and it allowed me to move from C/C++ to MicroPython, so all my project code (which includes a Raspberry Pi, a PyBoard, and a QT Py RP2040, are all programmed in either CPython (Pi) or MicroPython (the rest). So my robot actually has four computers on it, more if you count the processors used on some of the sensors...

junior pivot
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You can see the red "normal" LED on the photo above, with that light blue the RGB LED.

pine igloo
#

there's another one in addition

junior pivot
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Yes, most of the other boards (i.e., non-Pico) have a plain LED that you address via the logic on a single GPIO pin, plus an RGB LED managed via a separate library (in C/C++, CircuitPython, or MicroPython). The simple LED is just on-off, the RGB LED you typically send three values of 0-255 for each of red, green and blue. So black is (0,0,0), white is (255, 255, 255), 100% red is (255, 0, 0), dim orange is (60, 20, 0) etc.

outer brook
#

Is it RGBW?

cold pebble
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I think all of the onboard NeoPixels and Dotstars are RGB

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Itsy Bitsy boards also have a pin, V_HI, which provides the higher of USB or VBAT (useful for powering off-board things). And generally have one (or so?) more GPIO than a feather, despite being smaller (no space taken up by the battery charger, but there is a small backpack that works well for Itsy Bitsy boards to run on battery or charge when on USB)

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the different form factors each have their own features and ecosystems, just depends what you want

minor crag
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I got a screw terminal breakout board for the Pi Pico coming this week.. I considered just soldering the screw terminals directly to the pi but I don't think they'll quite fit. At any rate, the screw terminals cost as much as the breakout.. I'll see if they'll fit and maybe use the device like that so I can print a case and make a compact device out of it.. if not, I guess I'll just use the parts as intended

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i may experiment with circuit python, part of the reason I got that device is it seems to work with everything so, there's some flexibility there

fair lotus
#

Which channel should I go to with a question about an Adafruit product's mechanical drawing?

random cypress
cold pebble
#

no Linux, just CircuitPython 🙂

random cypress
#

CP is not an operating system though

cold pebble
#

CP operates microcontrollers, in the Raspberry Pi case it treats its hardware like a microcontroller

random cypress
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Wow, did not know that was possible

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Is that something they had to specifically build support for in the chip + board, or is it a general phenomenon?

minor crag
#

I think it's just the firmware you install into the flash on the micro controller that converts the scripting (in this case, python-based) into functions understandable by the MCU

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like when you code a video game in C+, the game itself doesn't actually run in C+, but generally C++ and the gaming engine does a conversion, which is why games coded in C+ or any other scripting language tend to have less performance than those coded directly in C++

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my understanding is the Arduino IDE, Circuit Python, Micro Python, are all just means to the same end

cold pebble
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CircuitPython conceptually is structured into two layers: shared-bindings which presents a uniform interface (the Python stuff we all see in readthedocs) regardless of underlying hardware, and common-hal which is where the code implements those uniform interfaces using the chip family APIs and capabilities.

minor crag
#

Isn't raspberry pi basically just a beefier micro controller though?

cold pebble
#

there are subtle differences between a microcontroller and a general-purpose CPU microprocessor like in a Mac or Windows. Raspberry Pi falls more into the latter.

minor crag
#

and a microcontroller is often just an integrated CPU, RAM, and flash on a single IC

random cypress
minor crag
#

seems accurate enough for the sake of discussion

#

it's just the Raspberry Pi has way more CPU, graphics, and RAM capabilities than most uses for micro controllers will ever need though.. why spend $100 on a device a $10 device can do just as well?

#

I considered buying a Pi myself but can't actually figure out what I would use one for, most projects I see do not appeal to me

main hemlock
minor crag
#

are there official stp/igs or .stl files for their products?

fair lotus
minor crag
#

I'm assuming Chris wants the drawings to design around them

main hemlock
#

we don't have designs for all, but for many

fair lotus
#

So I'm trying to create a component in my EDA program (DipTrace) to allow me to integrate the Adafruit 1.3" LCD (https://www.adafruit.com/product/4383) into my own board. The mechanical drawing (https://learn.adafruit.com/assets/82848) is a little difficult for me to understand, though. For example, there seem to be mixed measurement units displayed..

Adafruit 1.14" 240x135 Color TFT Display + MicroSD Card Breakout

Say hello to our 1.14" 240x135 Color TFT Display w/ MicroSD Card Breakout – we think it's T-F-Terrific! It's the size of your thumbnail, with glorious 240x135 high res ...

main hemlock
#

That may be Eagle being strange.

#

hold on for some links...

#

we don't have a pre-made model for that board

#

in the CAD repo

fair lotus
#

I'll have to look to see if there's an "Eagle to DipTrace" converter, I suppose!

fair lotus
#

@main hemlock I also am not able to discern from the drawing, where the pins are placed along the Y axis. There's a measurement for the X axis, but not for Y.

vagrant gyro
#

yah, the mixed units are a bit odd

#

those drawings are to provide some general dimensional info, so may not be 100% complete for everything

#

that's when using to original files is useful

uncut summit
#

I am one step closer to a running apple 1 replica, it turns out I had a mcp23017 installed but it should of been a mcp23s17 instead which just came in and now I just need to debug the Arduino Nano used for interfacing to the replica which is printing the wrong prompt in the serial console.

eager bramble
#

that's awesome

pine igloo
#

Need Help with Eclipse Paho MQTT javascript

#

just trying to establish a basic connection with a mosquitto broker running on raspberry Pi

#

getting this error

Screenshot_2022-01-11_181041.png
hearty karma
#

Perhaps if you click on the little triangles, it will give more info?

mild prism
#

Hey guys. I have a small project I am working on. I bought an overhead propane heater for my garage and the thermostat that came with it is garbage. I thought this would be a fun little home automation project. I am going to use python/raspberry PI with Adafruit SHT31-D (Temp reading) and Adafruit Power Relay 3191 (Dry Contact To turn furnace on). I see this being a pretty simple process. However once it is functional. I would love to do my home as well, but run it all off of 1 PI. I would like to setup multiple temp sensors through the house. Since everything will be spaced out do you have some suggestions for cable management? Maybe wireless?? What do you guys think?

pine igloo
# 
<script>
var client = new Paho.Client('192.168.1.7', 1883, "clientID");
client.connect({
onSuccess:function(){
console.log("connected");
client.subscribe("fahad/arduino");
}
});
client.onMessageArrived = function(message){
let li = document.createElement('li');
li.appendChild(document.createTextNode(message.payloadString));
document.getElementById('message-list').appendChild(li);};
</script>
<ul id='message-list'>fahad</ul>```
#

The Script running on Raspberry pi

#

hosted via pache server

#

apache*

hearty karma
#

I'm not sure what I'm looking at here, but I'm going to guess it's a tool screen in a web browser and you're looking at the console tab. Failures to connect to websockets are often network problems, so I'd look at the network tab next. You could also look at what paho_mqtt.js is doing in lines 1052-1054.

pine igloo
hearty karma
#

That's about what I expected: trying to open a websocket and failing. I'd look at the network panel to see why.

pine igloo
#

why is it making the request to MQTT directory?

#

i've changed the name of one folder that i had to mqtty

Screenshot_2022-01-11_220247.png
#

so it doesn't conflict with that but still it is making the same request

delicate quarry
#

From the next couple seconds of the video linked, it does look like it's supposed to be made to the mqtt directory.

pine igloo
austere plover
#

oops... wrong channel

pine igloo
solemn field
#

You're fine here, especially since you're already getting assistance here. For future reference though, #help-with-projects is also a good option.

pulsar shale
#

A package just arrived from Adafruit :excite:

pine igloo
outer brook
mild prism
#

@outer brook any suggestions for turning it into a wireless solution?

outer brook
#

none sorry, I only have experience with wired comms

solemn field
#

Or multiple Pis with WiFi, but for simple sensor readings, that might be overkill.

pine igloo
#

Should I learn C for Arduino and other microcontrollers?

limber grotto
#

depends on your goals and requirements

verbal aspen
#

Short answer: yes. 😁

mild prism
solemn field
mild prism
#

That's awesome thank you very much for your help

solemn field
#

You're entirely welcome! It looks like the basic Feather EPS32-S2 is in stock which might work for you getting started. There's a version of it that has a temp/humidity sensor on the board, but that one is out of stock at the moment. You can easily plug in a STEMMA sensor to the basic Feather.

mild prism
#

Nice !

solemn field
#

And actually, having it be a STEMMA sensor might be better because there's no heat coming from the microcontroller to interfere with the data. Anyway. Good luck!

austere plover
austere plover
random cypress
outer brook
#

Powerful as heck but really hard. I'm a weenie, I need for loops

random cypress
#

Reading K&R, The C Programming Language, I was like "wow, this is a really well thought-out software framework for assembly!"

outer brook
#

Haha

#

Yeah it's a neat book. I haven't finished it, let life get in the way. I'll probably start from scratch one of these days

limber grotto
#

find a nice C codebase and read it from start to end

random cypress
#

I've heard it called a model example of technical writing

outer brook
#

Hmm what's a good symbol to use to denote that a connector has the anode of an LED in one port and the cathode in another? Should I just use an LED symbol?

cold pebble
#

Assembly makes sense, it mirrors the hardware and you know where every bit is going. But it is a lot more work to get things done.

#

With Python, at least you know it's a huge abstraction, with rules that are easy to look up.

#

C is in a weird place in the middle, like a huge Swiss Army knife, with all of the blades open at once ready to hurt you.

random cypress
#

Which software pioneer was it that said allowing pointers to be null was the biggest mistake they made in their career

cold pebble
#

Tony Hoare, inventor of ALGOL W (apparently)

outer brook
#

that means a pointer that points to null?

#

Why is that bad?

verbal aspen
#

It means that every variable is implicitly either a pointer to an actual object of its declared type, or something which will cause a fatal error if it's actually used for anything. The alternative is something like C++ references, which are guaranteed to always have a real object associated with them.

outer brook
#

interesting. So like trying to deference a null pointer is a nono?

outer brook
#

can you test a pointer to see if it's pointing to null?

random cypress
#

yes, and this is done very often (as it has to be).

#

there are later language constructs (including std::optional in C++17) that try to more explicitly capture the idea of "etiher a Foo, or missing." One of the things that such a construct can helpfully do is force the programmer to explicitly handle the "missing" case in some code path before the program will successfully compile. This is part of what the Maybe monad in Haskell does, for example.

#

oh wow, googling "why can't you have an array of references" (the thing I was about to complain about), I just discovered std::reference_wrapper -- essentially, an adapter that behaves like a reference and there can be arrays of it. Nice.

grand hatch
#

hi guys

#

i'm after finding a this:

PXL_20220112_042838774.MP.jpg
#

in a drawer in my room

#

i'm trying to find out if it is actually the touchscreen model

#

i tried plugging the USB into my windows machine to use the calibration utility on it and i get a "not found" error D:

outer brook
#

I need a relatively large, plastic enclosure (at least as big as this one https://www.polycase.com/wq-83) Anyone have a preferred supplier? Polycase's largest may not be big enough for me

#

I also need one taller than the one I linked

uncut summit
#

Which pin method to solder for these ESP32 mini's, double row on bottom? pass through header pin as seen on left which would be better

tuFJ-aQ2KUhmICCBspg32sn4oQjxtMjVXtoagCxAVgyMc-XsQfRqS1-05-8f7eg5nFKNkHfH_CXzyRrf88GCRe8_wZJN0kyZyCnkPwmucD2gguLtWapNKHB7OD1FcoKOVzNOIqwZp32EEMR49g06Yc1O8ixJ1gbrQVXz83iywe0QVv4pMmiNf3GXVrW8CL2qPiQntFig9d3rIoLIq7Va5rZt15t_eb4Vwb6oN96Gi8Ub4z2oY3vjI9W3cpDKKW4IZTi9iJbXVu6E5BaOqWH9Kcek3dLzdXLM0Wv2k2yrPKgbhnDmvdDT8zIi499cqrAPxzsHGOX_NuBpOuVChgbF8lP-pSqesatMSi4fG2l3SqTHW6kQBJoI8G6iNlMddSwETIlGZnOHbRaXCwLFslfIKT0hXLwgLke8z3kDAtYW7clwfaifyXSNU4DBLIki8wbjIf22UMWRFNTgw5FB15Qj38tThZvpu3bAmU8pls4Et9YL7bpo-jlm4FOvyJ0r..png ICPv2uRW3mw2RnY0VEnwKcVfyWjV0WmUNqHApXEvk9neb17Q2iE9DIkxV_zjzmCHvNuIJPK7N6nn54H0ioEM1tKfTcleegmrMRg0bh1InTv3vzI-cwijLeeeI1WB6nsnYqsfKBjAZ6MRfXao_t_g_RNmuMYJVK5GTxmjBXVg683cjizuM9cZdxb6sUHzcBp1mX7x9BmLagjA6pWqYB6pvnGn2eqjLeEGbJKqLmO4OwQ9f1EP6XcpmQVff4df0t_tfvU-YkBGR44KjRnNFKdGlpyLXN_WNjd42Aoog9kFPBGAgzQRtx7l2XKWPY-jnuTe6wspoiBZNOf2oZOtaAMF0Pzufxg0t8TTiaTPy0jxduw6737IAhIMe9mQGm1f-6fVbi1shlMSPphjrm-rW3etvgWP_vU8tMTRPs5CrcAoHjpcE3XE7a6K7heJ9CBju7Xs1mSvITY9CQKzen1M9UvUvby7h37sf5RMLz1N1LjT6RZrrKVEf4He498tONV0..png
#

I have 4 mini's that I can do

pine igloo
#

or husky case

#

or do you want something more wall mountable

#

i can't tell what your going for

outer brook
#

I need something IP rated that I can easily dremel panel cutouts into and then mount connectors

#

I think Polycase has a taller enclosure that may work, I need to do some math

#

of course polycase doesn't do custom machining on the part I want custom machined. Sigh

pine igloo
#

@hearty karma Thanks for looking into my problem and suggesting me things i could try, It's working now, i still don't know what the problem was

#

But it's working and this is all i wanted lol

hearty karma
hearty karma
# grand hatch i'm after finding a this:

I'd have to download the design files to be certain, but I strongly suspect yours is the version without touch: the unpopulated chip to the left of the AdaFruit logo seems like it would be the AR1100, with 4 sense lines going to the display connector and 2 data lines going to the USB connector.

hearty karma
hearty karma
jade dirge
deep brook
#

Hi. What's the best channel to ask questions about the magtag?

solemn field
deep brook
solemn field
#

Or planning to anyway...

#

Trying to sort out where is best for you to ask.

deep brook
# solemn field Are you using CircuitPython?

I'd like to, it's a brand new device. I had another older Magtag which I got working but I might have fried it when updating the firmware. With this one I was surprised it didn't work first time

solemn field
deep brook
#

But am I right in thinking out of the box I should plug it in and it would show up?

solemn field
#

No.. I think it ships with Arduino code, which doesn't pop up immediately. Did you try hitting the reset button twice to get to the bootloader?

deep brook
#

Ah ok

solemn field
#

It's also possible it shipped without a bootloader, but that's unusual at this point (it happens more in the first run of board).

#

I don't remember what MagTag is supposed to do out of the box. Been a while since I opened one. But try getting to the bootloader, and loading CircuitPython that way.

cold pebble
#

re: null pointer stuff from yesterday... just hit an I2C bug today that appears to be a null pointer de-reference issue in the Espressif IDF

icy moth
#

It’s one of the deadly sins of C/C++ development

cloud walrus
solemn field
pulsar shale
#

It's the next adabox-of-pots.😆

true nova
#

Does anyone have experience modding Casio watches?

minor crag
#

guys... I made an error in putting this pi pico onto a breakout board.. so decided to attempt to desolder it and go a different route.. but solder got between the pico and PCB of the breakout and the desoldering gun was no use

#

anyway.. long story short I now get to find out whether or not a Pi Pico can withstand a blow torch

#

because that's what I used to get them apart

#

So, I just found a micro USB cable and plugged it in after putting headers on it.. still works

#

hats off to the Pi Pico I guess.. I've destroyed more expensive boards with a lot less

#

and the only serious burn I gave myself wasn't from the torch.. accidently slipped with the soldering iron and raked the iron across a couple knuckles

outer brook
#

Scratch that, avoid a blowtorch all together

minor crag
#

it was between the boards, couldn't get a wick to it

outer brook
#

ah

minor crag
#

and the torch worked without damaging the device

#

i held the scrap board I was trying to get off with some pliers, evenly heated the back side of it up, spreading the flame around till the pico fell off

#

them butane torches are hot though.. I tried to use one to tin some wires, but the solder melts on contact with the flame before it even reaches the wire

#

I probably should practice using a heat gun more though.. I may order an SMD practice board

delicate quarry
#

Pico is actually pretty durable thanks to it’s single-sided design. The solder would’ve melted before the heat really started damaging the smt components on the other side…

minor crag
#

yeah, that's what I was guessing as well.. besides, I was at a point where it was useless to me unless I could get the old board off if.. so either it worked with the torch or I was buying a new one anyway

#

now I need to figure out though how to do with it what I needed to do with it... figure out a simple code to work as a 6-button Sega Genesis controller... I could wire it up to the controller port of one of my Sega Genesis consoles and go at it from there.. but, it's a bit of a hassle to set all that up.. I may take another micro controller of mine and set it up to read a Genesis controller over USB instead

#

good thing I have a DB9 connector on a breakout board

cloud acorn
#

hello,im using qwic cable i would kind of need to power them to a power source that is betwwen 3,5v and 5v its seem like qwic cable handle 3,3v well but it is still good for 5v? without making any bad thing to my sensor

#

like i dont know if the qwic port goes to a regulation down to 3,3v

steady gulch
#

it doesn't in general, it depends on the board

#

most of adafruit's STEMMA QT breakouts are 3-5V compatible

cloud acorn
#

yeah that true but there is the thing i have a pin vin and 3,3v the vin is for 5v down to 3,3 and 3,3 well its 3,3 but i dont what does the qwic port is?

#

the board is the mini gps from adafruit for reference..

steady gulch
#

Best of all, we added all the extra goodies you could ever want: an ultra-low dropout 3.3V regulator so you can power it with 3.3-5VDC in, 5V level safe inputs on UART and I2C, a footprint for optional CR1220 coin cell to keep the RTC running and allow warm starts, a green power LED and a tiny red PPS LED. The LED blinks at about 1Hz when a fix is found and is off when no fix.

cloud acorn
steady gulch
#

the 3Vo pin is an output from the regulator

karmic obsidian
karmic obsidian
haughty flare
#

can an airbrush air compressor be safely converted into a vacuum chamber pump

ruby stirrup
#

Ok.. maybe I'm missing something but what is the fascination of working with floppy disks in 2022?

outer brook
#

They're now old enough to be retro

#

instead of just out dated

proper lake
#

holding out for the day that turns into "vintage" or "antique"?

steady gulch
#

trying to save them before it's too late

cold pebble
#

I see those Apple ][ drives in the videos, I'm hoping and waiting for that 🙂 five and one quarter

hearty karma
west fractal
#

Price of the 3 cents microcontroller (PMS150C/G) is approaching the original price

#

With stable supply

#

The current pricing of PMS150G is already sub 0.2 CNY, still higher than the historical lowest which is 0.09CNY or 1.5 cents

outer brook
#

Are those the ones you can only program once?

west fractal
#

Yes

#

And massive amounts of chips are ready to order and ship

#

Might be a good i2c controller for something simple like a high power PWM LED

#

StemmaQT high power LED

#

powered by Padauk

hearty karma
#

If the toolchain supported modern operating systems, I'd give 'em a whirl, but I punted much more expensive PICs for the same reason for the even more expensive AVR line.

violet torrent
#

i have a floppy drive i wanna work with, and it has a 34 pin connector, but I'm not 100% sure on the pinout

steady kite
#

https://github.com/dhansel/ArduinoFDC

https://hackaday.com/2021/04/30/an-arduino-with-a-floppy-drive/

GitHub
GitHub - dhansel/ArduinoFDC: Library for using an Arduino as a flop...

Library for using an Arduino as a floppy disk controller - GitHub - dhansel/ArduinoFDC: Library for using an Arduino as a floppy disk controller

Hackaday
Jenny List
An Arduino With A Floppy Drive

For many of us the passing of the floppy disk is unlamented, but there remains a corps of experimenters for whom the classic removable storage format still holds some fascination. The interface for…

#

@violet torrent

meager ore
analog bolt
#

Any recommendations on groups, Discords, or otherwise communities for small hardware startups? Specifically ppl selling their created products?

delicate quarry
delicate quarry
#

I just realized I have an excess of pic24s from a product development cycle, and they're pretty powerful chips with a pretty nice function set for something that's not completely out of stock everywhere. Has anyone ever considered the possibility of a circuitpython port for any variety of PIC? What types of challenges should I expect if I decide to explore the possibility further?

pulsar shale
#

What is the default firmware that ships on the Feather RP2040? I guess I can just copy it from the RPI-RP2 drive...

steady gulch
steady gulch
pulsar shale
#

Got it, thanks!

steady gulch
pulsar shale
#

I didn't know about picotool.

dry fern
#

Looking at the Adafruit ESP32-S2 boards, they all have a IOxx_DBLTAP circuit with a 1MΩ resistor and a 1µF capacitor both tied to ground. I can't find any documentation on what this is for or when you would use it. I looked in the CPy and Arduino pin definitions for the new QT Py and couldn't see it there either. Anyone know what DBLTAP does?

cold pebble
#

I recall some early discussions about double tapping a button to get into one of the bootloader modes, but afaict from the schematic and physical (QT Py) board, the xx_DBLTAP doesn't go anywhere, except to a pin on the MCU that isn't exposed in board. But I'm a little surprised if there are extra passives on the QT Py (unless for a future version)

icy moth
#

Just kind of there

dry fern
#

I pulled up the BRD file. It's on the bottom layer, then to a via. nothing is connected to the via on the top side.

cold pebble
#

the plot thickens... 😉

icy moth
#

It’s possible that it was meant for a test point but didn’t make it to final

cold pebble
#

something tells me it's there for a future feature that may or may not get implemented

#

it's possible that some bootloader outputs there and stores a charge which is subsequently read??

dry fern
#

The Metro ESP32-S2 has IO38_DBLTAP. It is defined in CPy as { MP_OBJ_NEW_QSTR(MP_QSTR_DEBUG_RX), MP_ROM_PTR(&pin_GPIO38) }, So maybe a trick to not need to connect anything to RX when debugging?

haughty flare
#

tomorrow is my first day of class so the sylabus is finally available. turns out ill be using a rasberry pi

dry fern
#

@cold pebble you were right! I found it in the UF2 code.

// pin value long enough for double reset detection.
#define PIN_DOUBLE_RESET_RC   10```
#

I guess now people can search DBLTAP in Discord and find this info. 😉

cold pebble
#

I don't know what double-tapping Reset does. I use Reset + Boot to get into bootloader. Maybe for boards with no Boot/GPIO0 button (but the Adafruit boards have both). Even the original Saola has both buttons.

#

oh... if I get the timing right, it does put it into bootloader mode, with a different USB name (/dev/cu.usbserial-{redactedhex}) than Boot + Reset (/dev/cu.usbmodem01) nope, it was a different device

#

not sure the distinction of the two methods, it appears to the host the same afaict

dry fern
#

that's neat. Reset+Boot = download mode. Reset then boot = bootloader. Double tap reset = bootloader. Double tap is easier than the reset then boot sequence.

main hemlock
# delicate quarry I just realized I have an excess of pic24s from a product development cycle, and...

As far as I can tell, the most capacious of these only have 52kB of RAM, which quite low for doing significant CPy work (compare with 32kB on the SAMD21 and a lot more or nearly all the other chips we support). You'd want to get a gcc toolchain working, and then you'll need to implement a bunch of common-hal/ to get minimal functionality. Given the RAM limit, I would say it's not worth it, with RP2040 and other chips more available.

steady gulch
# cold pebble I don't know what double-tapping Reset does. I use Reset + Boot to get into boot...

@dry fern Adafruit has been using double-click reset for bootloader on the SAMD boards, but the ESP32-S2 requires that external circuit to be able to detect the double-click, so for example it doesn't work on most 3rd party boards. Personally I find "press boot when the LED is purple" easier than getting the double-click timing right except maybe on the FunHouse where the boot button is hidden and impractical

#

(correction: purple not yellow)

mild prism
#

In the example it is hooked up to a raspberry Pi. (which is my plan as well) but it shows using circuit python and the repl for doing the programming. But wouldnt it just be standard python on the PI? Am I missing something? Is there actually programming on the board itself that needs to be done?

steady gulch
#

(adafruit-blinka is installed as a dependency by pip and provides the board, busio, and other CP modules)

mild prism
#

Some of this architecture is a little over my head. All the python programming I have done to date hasen't involved any hardware. So the program they show there would be running on the raspberry pi itself? How does it know what pins it is hooked up ot?

#

maybe im not familiar with the i2c protocall

steady gulch
#

in this case, the Pi has default hardware I2C pins (GPIO2 and GPIO3), top left: https://pinout.xyz/# which is what board.I2C() inits the I2C bus on

mild prism
#

oh the i2c is an actual form of communication

#

I will research more about the i2c protocall

steady gulch
#

I2C is a serial protocol yeah, you don't need to know the details to use the driver, the basics is that each device has an address, and the drivers use the default address unless you provide one in the constructor, and you can run a scan to see what's on the bus, the Blinka guide has more info on how to use/setup I2C

mild prism
#

thats the part I was definitely not understanding.

#

So does the SHT31-D Board need some sort of programming for this protocal or just the programming on the raspberry PI side with the drivers handles it?

#

Is there any slave programming required for the sensor

#

thank you very much btw for helping me understand this better

delicate quarry
#

Nope, the sensor is "hard-coded" to behave straight out of the box (or bag)

#

You just have to have the right software on your Pi side to be able to read the data correctly.

mild prism
#

Cant wait to get this project going. My furance in my garage is consuming a ton of propane. Now I can really understand what my actual usage is based on certain set points.

#

I have a load cell setup as well to actually weight my propane tank

#

has anyone made any sort of case for the SHT31-D board ?

steady gulch
dry fern
mild prism
#

I can 3d print stuff at work no problem.

#

My garage is just not the cleanest environment. I don't really know if I want the baord to just hangout lol

#

in the adafruit code example

# 
# SPDX-License-Identifier: MIT

import time
import board
import adafruit_sht31d

# Create sensor object, communicating over the board's default I2C bus
i2c = board.I2C()
sensor = adafruit_sht31d.SHT31D(i2c)

loopcount = 0
while True:
    print("\nTemperature: %0.1f C" % sensor.temperature)
    print("Humidity: %0.1f %%" % sensor.relative_humidity)
    loopcount += 1
    time.sleep(2)
    # every 10 passes turn on the heater for 1 second
    if loopcount == 10:
        loopcount = 0
        sensor.heater = True
        print("Sensor Heater status =", sensor.heater)
        time.sleep(1)
        sensor.heater = False
        print("Sensor Heater status =", sensor.heater)
#

how would you add the address of the sensor. I am planning to use multiple sensors with an average

#

sorry. I forgot how to format the code properly on discord

steady gulch
#

(code syntax is shown in the #welcome channel, and you can edit your message)

dry fern
#

adafruit_sht31d.SHT31D(i2c) assumes the default address that Adafruit ships the board with.

steady gulch
#

(it's 3 backticks on a line with py at the end)

mild prism
#

Thank you

steady gulch
#

you just add address=... in the constructor

dry fern
mild prism
#

oh okay so that makes sense

#

is it possible to change the address so i wouldnt have duplicates?

dry fern
#

from the learn guide:
ADR - This is the I2C address selection pin. This pin has a 10K pull down resistor to make the default I2C address 0x44. You can tie this pin to Vin to make the address 0x45

#

If you are using the STEMMA QT connector, you can simply solder a short wire from the VIN to ADR pin. (VIN on the QT port is electrically connected to the VIN pin)

mild prism
#

thank you linux

#

where do I find this learn guide

dry fern
steady gulch
#

there's a V pad on the back too, no need for a wire

dry fern
steady gulch
#

I wonder if it changes the address "dynamically" or if the board needs to be reset to acknowledge the change, because if not you could use one additional wire per sensor to activate only one at a time on the other address, so you get as many as you have pins, or maybe the reset pin would allow doing that

#

that is if you want more than 2

mild prism
#

Oh perfect i thought there might be another guide I didnt see.

#

Thats a really interesting concept for having an unlimited amount of sensors

#

I can probably get away with two sensors to start anything and in the future I will need to add some sort of wireless interface so that will separate my usage anyways.

dry fern
#

I have 9 AHT20 sensors in the house. Raspberry Pi can get expensive to use as temperature sensors. If you do expand, consider using a microcontroller. like the QT Py esp32-s2 https://www.adafruit.com/product/5325. You can use your Pi with something like Home Assistant to aggregate the data. Or there is Adafruit.io with Wippersnapper.

mild prism
#

yeah forsure thats what I would do

#

I just went to set it up and realized that i dont have any header pins for the raspberry pi

#

dur

mild prism
#

you guys have any recomendations for header pins for a pi to connect to a bread board

eager bramble
#

those are nice, can solder on and poke into the breadboard and still put stuff on top of the pi

#

I would avoid the hammer headers if at all possible.

mild prism
#

so i just hooked up that application and i am getting a traceback. Value error: no hardware I2C on (scl,sda)=(3,2)

minor crag
#

I think i'm going to buy a cheap 8 bit arduino, like an Uno

mild prism
#

valid i2c ports ((3,3,2),(1,3,2),(0,1,0))

steady gulch
#

did you use board.I2C ?

mild prism
#

i put their example in ```# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries

SPDX-License-Identifier: MIT

import time
import board
import adafruit_sht31d

Create sensor object, communicating over the board's default I2C bus

i2c = board.I2C()
sensor = adafruit_sht31d.SHT31D(i2c)

loopcount = 0
while True:
print("\nTemperature: %0.1f C" % sensor.temperature)
print("Humidity: %0.1f %%" % sensor.relative_humidity)
loopcount += 1
time.sleep(2)
# every 10 passes turn on the heater for 1 second
if loopcount == 10:
loopcount = 0
sensor.heater = True
print("Sensor Heater status =", sensor.heater)
time.sleep(1)
sensor.heater = False
print("Sensor Heater status =", sensor.heater)

minor crag
#

I need to find a good through-hole soldered micro controller

mild prism
#

i get a little confused here:Below is a complete example that measures the sensor readings and prints them every two seconds. Save this as code.py on your board and open the REPL to see the output.
because i am using a pi ot control the board but it almost sounds like it wants to download to the temp sensor board

steady gulch
#

oh yeah, you need to enable I2C in raspi-config I think

#

nah that's just because it's written with microcontroller boards in mind

mild prism
#

yoou might be right

#

yep its working now

#

that was very quick and easy!

minor crag
#

hey, can that through hole mounted atmega328 chip on the Arduino Uno handle 5v power?

pulsar shale
#

Yes it can.

minor crag
#

i may look into getting an Uno then, desolder the chip, solder in a pin socket, then, theoretically, I can socket a chip in, program it, pull it, and solder it into something else for a smaller footprint

limber grotto
#

i think it's already socketed

minor crag
#

i'll have to add one to my list then

limber grotto
pulsar shale
#

Surely there are better ways.

limber grotto
#

or a dedicated programmer

#

or a uart

minor crag
#

it be easier to just program one, pull it off, and stick another one on if there's a socket

#

some stuff I want to do doesn't require having a full arduino environment built into it.. just some basic inputs, outputs, and some logic

limber grotto
#

i think you still need some sort of programmer to get the arduino bootloader on, though

minor crag
#

for example, soon I will build a 6 button arcade controller.. but output will be programmed to work with a Sega Genesis console... 12 inputs, 7 outputs, plus power and ground

pulsar shale
#

That's a cool project.

minor crag
#

I mean, if I really wanted to be lazy, I could just get a broken 6 button controller, desolder the micro controller from the PCB, solder that into a breakout board with some screw terminals and be done

pulsar shale
#

New controllers for a vintage brain.

teal wadi
#

I don't remember the ways in which it was tricky, though; It was a long time ago

minor crag
#

you're right though.. probably owuld have to get the bootloader onto it.. so I may be better off building a flasher on a breadboard or something

rough geode
#

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humble thunder
#

latest package of Adafruit goodies came in the mail, that is one awesome bubble mailer this time around lol

minor crag
#

so, what exactly is the difference between Arduino, Micro Python, and Circuit python in terms of their functionality?.. are they all just different bootloaders designed to run different types of code? Is one lower level than the other? Are they all good for simple, low power stuff or better suited for more powerful devices?

limber grotto
#

arduino is C++ and is compiled to machine code, circuit/micropy are interpreted and dynamic so they require more resources

#

for example the arduino uno you were talking about, will not run any python (too little ram and flash)

minor crag
#

then for what I am doing, I should focus more on arduino since I have a need for simpler codes that can run on lower power hardware

verbal aspen
#

Note that Arduino is just one possible C/C++ framework, too. There are vendor-provided HAL libraries for specific chips, or you can roll your own bare-metal code, etc.

humble thunder
#

though Arduino's ecosystem is pretty nice, even if using their IDE is like sitting next to that grumpy old man at the bus stop

#

tons of libraries available for Arduino to do all sorts of stuff, and if there's a board out there, be it a small low-power board or a big ol' board that's got more processing power than my first desktop computer, they'll almost always have the ability to run code written in Arduino

lofty verge
#

hey would yall buy a robot arm

#

ps its only 700 mm long

humble thunder
#

the new QT Py ESP32-S2 is 🔥

#

both in that it's awesome that it's that small and that it runs at the temperature of the sun

steady kite
#

oh it's based on the esp32 pico d4

humble thunder
#

the S2 isn't dual-core and only does wifi, no bluetooth

pine igloo
#

how can i convert a double to string type in C?

cloud walrus
pulsar shale
#

Any pointers for using code.circuitpython.org? When I try to connect I get a bluetooth spinner that never goes away. I'm using the FeatherSense nRF52840.

mild prism
#

Do you guys have a recommendation for header pins for a raspberry PI to connect to a bread board?

novel ridge
#

Also I use male-female dupont cables

#

If I only need to connect a few pins

delicate quarry
novel ridge
#

Oh yeah I forgot about that one

keen lichen
#

@pulsar shale what OS are you on?

#

the developer console will have more info

pulsar shale
#

It's windows 10.

keen lichen
#

melissa would have more debugging ideas. perhaps make an issue for it to discuss

mild prism
#

this is a really nice suggestion

#

I need a better case too. The one for my pin doesn't give me access to the pins without the cover off

cloud walrus
mild prism
#

i wish i bought one with my last order lol

#

shipping is expensive here

#

Do you guys have a recommendation for a little 7 segment display and also some push buttons for a bread board?

cloud walrus
#

These I2C 7 segment displays are nice and only need 4 wires.

delicate quarry
novel ridge
#

I have been waiting for those I2C 7 segment displays to be in stock 👀

#

They look sweet

haughty flare
#

for ribbon cables what are the connectors called and do they come in 4 pin?

keen lichen
#

I think they are IDC

mild prism
#

If I'm using the temp sensor to a raspberry pi using idc do you know of any cable length issues ? I'm thinking I'll be around 40 ft. I'll probably use ethernet cable as wire. What do you guys think

verbal aspen
#

What kind of sensor? I2C would have trouble with that length, and analog ones like thermocouples have pretty weak signals that might pick up some noise.

mild prism
#

Sht31

junior pivot
proper escarp
junior pivot
cloud walrus
junior pivot
# cloud walrus Or this https://www.adafruit.com/product/4756

Yes, but for those one likely has to drop the bus speed to 100K. I think it'd be an experiment with any of these to see if it could work reliably over 40ft, nothing (I believe) would be guaranteed. There's a lot of issues (power, capacitance, cable quality, EMF, etc.) at hand.

cloud walrus
#

Runs with any bus voltage, from 1.6V to 5.5V and up to 400 KHz SCL speed, with cables up to 4000pF. No special firmware, software, or configuration required. Simply plug the power, ground, SCL and SDA connectors into your bus and watch as your rise times magically turn sawtooths into square waves.

#

But I’m just a software guy…

junior pivot
delicate quarry
#

Oh, the PCA9615 works great. I've never pushed it to 40 ft, but I definitely get extra stability on the 2.5ft I run it on, and that's without twisted pairs...

#

It would be pretty sweet to make a Cat-6 breakout for I2C....

pulsar shale
#

Pretty Pins for Metro M4, is it too much to ask?

mild prism
#

anyone familiar with the featherwing power relay? I am putting 3.3v to the 3v pin and 0v to the gnd pin but the relay is not switching. Am i missing something?

delicate quarry
mild prism
#

what do you mean close a jumper

#

i see there is a signal pin in the middle. I didnt even realize it

#

oh so i would solder a wire from that signal to another pin to connect to

#

its working well. Is there a good way to connect that signal to a pin? I soldering in all the header pins when i first pulled the board out

delicate quarry
#

There should be some metal pads you can just short with a glob of solder

delicate quarry
mild prism
#

oh i get it

#

thank you that works well now

#

all my programming is working time to testout my new setup on the furnace

#

thanks everyone for the help so far!

proper lake
#

I scrounged around for a tutorial on a circuitpython module for the display, and I am proud to say I am no longer abusing the OLED featherwing by appending layers on top of layers

stable cloak
#

Hi, is there a community for people writing rust for adafruit boards? Thanks!

cloud walrus
stable cloak
main hemlock
stable cloak
#

How can I factory reset an itsybitsy nrf52840?

minor crag
#

hmm... i got a 32u4 device today

#

debating if I want to solder on the supplied male header pins or buy and wait for female ones... If I can avoid breadboards, I do

daring goblet
#

I'm not sure who to ask this question, but does Adafruit sell any of their products through Amazon, or is that a 3rd party reseller?

pine igloo
#

i know they sell to microcenter

cloud walrus
#

many of the things I see on Amazon are soled by kjdElectronics, which is on the distributor list. You can cross reference them to see if they are a legitimate distributor.

proper escarp
main hemlock
daring goblet
minor crag
#

so far.. I am liking how simple 32u4s are for what I am using this for

tawny lantern
#

What's up fellas

tawny lantern
#

I wish digikey had a better ui

minor crag
#

the only issue I have with Digikey and Mouser is I have to wait until I have a need for enough components to justify paying for shipping

#

so, some times I just keep a list of stuff I need for future projects and when I have enough, then I buy a bunch of stuff at once

hearty karma
#

It is possible to get free shipping from Digikey if you prepay your order.

minor crag
#

well, I don't need anything from them at present

#

I was considering building an NES or Famicom from scratch soon though.. so if I do that I'll be needing a lot of small parts

verbal aspen
minor crag
#

@verbal aspen All components except the CPU and PPU are available... and up until just recently they were still selling new production of those in Ali

verbal aspen
#

Surprising, but cool... 👍

minor crag
#

if I do it, I'll probably use those parts from a damaged NES

#

nevermind.. just found a pair of reproductions (though they're not 100% perfect) for $7.50 shipped, so yeah, if I wanted to do all brand-new I could

#

thing is, with those not being 100% accurate, and I don't even believe they're in production any longer, and originals degrading so frequently now due to age, it has me wanting to port specifically the functions of the PPU and the CPU to their own, individual, low cost, low power FPGA chips soldered on boards with headers that match the footprint of the original chips, for a direct solder-in replacement

#

but that has me thinking... the sub $30 FPGA device I use for learning FPGA with.. it can handle an entire NES console being ported to it... one side has 32x2 headers I could directly solder a 60-pin Famicom cartridge slot to.. so maybe that would be more worth the effort

prime adder
#

I need to buy an oscilloscope and don't want to 😞

#

maybe it's technically "I want to buy an oscilloscope and don't need to" 🙂

haughty flare
#

is there an acrylic case for the large breadboards with binding posts

outer brook
#

I don't know of one

haughty flare
#

im considering making one custom as i made an alteration to it that may need custom dimentions. i am putting 2 switches and 2 pots where the binding posts usually go

#

right now i wish i knew more about laser cutters. i could use one on my ender

proper escarp
#

a half-decent laser cutter costs upward of $2000

#

a good one, $15k

#

all these $400 ones are not worth the money

#

so .. having a personal laser cutter is justified only if you do a lot with it, and sell your work

#

otherwise, it is easier to order your design lasercut, say at ponoko.com

hearty karma
hearty karma
# proper escarp all these $400 ones are not worth the money

I bought one of those K40 style ones, because it was cheaper than buying all the parts separately. Then I replaced the controller with an EiBot board, so I could control it with modern open source software via USB. I also upgraded the viewing window, now I'm toying with the notion of adding air assist.

proper escarp
#

of course, one can turn them into something useful - if you have knowledge and time

hearty karma
#

I did look at one of the much more expensive ones from a US seller, but it was DOS-only.

uncut summit
#

Which forum do I post or do I email support about what looks like a defect in manafacturing of couple adafruit products, weak soldering of the usb-c connectors to boards.

prime adder
#

ok, so it looks like I need to check out the used scope market lol

minor crag
#

lmao... raked a soldering iron across a finger... sizzled

proper lake
#

not sure if this is the right place to confirm, but if I'm using a pin on a qt py to power a 3v water pump, I should add a resistor in series to keep current in a safe range because of the V=IR shenanigans right?

limber grotto
#

which pin?

steady kite
#

make sure the pin can handle the current, a 3v water pump sounds like it might be a bit current heavy.

#

it's a motor so i would honestly have a transistor in place to do switching

upper coyote
# uncut summit Which forum do I post or do I email support about what looks like a defect in ma...

If you think it was a problem at the factory, then you should definitely email support about it. They can help you to see if it's something you should address or they should replace. Most stuff from Adafruit is tested at the factory before going into stock, but if it's the mechanical mounting of a connector, that might get by. In any case the nice folk at Support@Adafruit.com can help you figure it out.

main hemlock
#

@uncut summit post in https://forums.adafruit.com, with pictures. We can get you replacements If you write to support they will ask you to post in the forums

#

then a support person will approve a replacement, if it makes sense, and then you will write to support with a pointer to the thread, saying that a replacment has been authorized

mild prism
#

Hey guys for this application im working on im using the GPIO on the raspberry pi to turn my furnace on. Im trying to track total on time. is there a way I could monitor how long a GPIO pin is on? A continuous timer that restarting the script wouldnt shut off

cloud walrus
mild prism
#

pefect ty

main hemlock
cloud walrus
#

rats -- in cpython it does reset with the script...

mild prism
#

this is standard python

#

because the main programming is on a pi

cloud walrus
# 
[Clang 12.0.0 (clang-1200.0.32.29)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import time
>>> time.monotonic()
10.692305542
>>> time.monotonic()
12.808227167
>>> time.monotonic()
14.292287708
>>> time.monotonic()
16.588722708
>>> 
jerryneedell@Mac-mini ai_thinker_esp32-c3s % python
Python 3.9.5 (default, May  4 2021, 03:36:27) 
[Clang 12.0.0 (clang-1200.0.32.29)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import time
>>> time.monotonic()
14.12584975
>>> ```
mild prism
#

but another quick question. Doesnt anyone know if the raspberry PI gpio would turn off if a script is terminated while the IO is on

main hemlock
#

I would just test it.

#

to make sure

mild prism
#

okay

#

thanks guys

cloud walrus
#

sorry for the bad suggestion.

mild prism
#

no problem

#

i think i will make a text file that just tracks minutes maybe

main hemlock
#

since it's on a Pi, you can use time.asctime() or many other things to print out a formatted time value. Could make a .csv file with a timestamp and a 0 or 1 or OFF/ON as the second column

cloud walrus
#

time.time may work ```>>> time.time()
1642354982.612792

time.time()
1642354986.233875

#

It is the number of seconds since January 1, 1970

main hemlock
#

datetime.datetime.now().isoformat() and other datetime functions are also helpful, and human readable

# 
>>> datetime.datetime.now().isoformat()
'2022-01-16T12:46:20.069106'
uncut summit
#

@upper coyote @main hemlock I don't have a broken device but I noticed the USB-C connector legs barely go into the PCB so it's not soldered very well, I have had the connector lift from the board on the macropads, all three I have did the same thing I fixed by put putting more solder into the four post holes for the connector thus strengthening the connector to the PCB.

main hemlock
#

@uncut summit I realize you were the one that mentioned it earlier. If you have photos of the pre-soldering condition, and could post it in the forums, that would be great. Otherwise I will just pass it on.

uncut summit
#

@main hemlock I looked up the connector on digi key and the specs list the legs as only being .9mm while the PCB is 1.59mm thick, I checked anything that uses this connector and it was also the same on the qt-py rp2040 and the feather rp2040 probably fixable by simply letting more solder fill the post holes when fabbing.

#

@main hemlock yes here first pic is from a qy-py rp2040 and you can see the post holes don't have enough solder, the second pic is a macropad with the connector that got lifted from the PCB

WtY9AgRTMhJHvNVZrTo5wqzualX8_PAr2y43n-AsLFKl3ZJJXCKZEPdCODNjKwc1-rhOw-mLAA5DrPckqQWix3-bskbe64v9SdHN9VdrUl_uU0hp4uSMt3b9_kq8m4eMNtHIP-m7_u8sBOmPLB8gTsuAfuh6v5Wb_-Dj91glV5y1s67WHwpReCTghPTacHrSl3ea8r1jeap0j-9_HjmqAbRWhWtBEk8GX843jQpneV8P0SCtxRLtAks4TReHrsQqAOv0ZaYiFMW4Tq4yV3JGmwnz-PFDab1vlDI2vTxqXJ5BBCql8vt5FFbzw-VYMtTmlFS897gtXo5lfp8gY2PoaSnbF4LrbctaHM42qgPE6bUnvpGriqp-c6p0UJbmbHeuEHQYheCRBgdAtTZ54WChyYXtCW2hd3hZE8gdtr7X2epeVNbl1b-6YdC9WSo2NbLLE_TXq4zh5i0cbLJ_EY_4ayARSjWNJc8oLkgQuiRMw-smij0nAuPN_h5w7ShU..png GAZA_bqt3g9ueEgYD2ibrUG1mRro_bTyoA8_iEgM0ocBSYLncqmeY4qiIDncoPDJtGOpjCtnFJ0XZqtyuhqGCYO6CuhzDOyLyCHiXZlYSik9cCWQXkv0bhcJFfNit9vzizgqeO_CSYOFrTxgTCrSJCEEmYwxHpjFi7kXt8r8CPEWOIiHxyIHK7Usb4iJV8Rc1fPacVfuopHJubrzx3UPY1jLZduBOj60wjZlhxEHpqQqnUo3Srg8bQPDdo4tkfKXzhVexkDOC6xc-Dshjy3sJ4frfC2EflyKwHXvg4uX31UfV4QByVJqbQQ0DXEfXKNI9j7YQXLNOMQxjvJws0YCOCAUDfsOPMl8Jlc_J7edUCsJO1YoW1IazapYGPj75tF7yw5t-Mjn9eWj5oVr6Smb8Z5QD1oqbVCTmQeCOa18YY-UCvdyhWzROm7DvHHYQ2a87-7gr8GODQOCo0AgWnw4fq4TnQkvSsi7-pKKk2Yl16u_CoHuz32VabxgIfUK..png
main hemlock
#

Could you post this in the forums and I will point QA and others to it. We appreciate it.

uncut summit
#

@main hemlock I was in the forums, which area? I looked for a particular support catagory and did not see one.

main hemlock
uncut summit
#

@main hemlock ok

main hemlock
#

some of the categorizations are out of date

uncut summit
#

@main hemlock ok posted

main hemlock
#

tyvm

proper lake
haughty flare
#

They arived!

20220116_165043.jpg
outer brook
#

Look fun

pine igloo
mild prism
#

Using Python so you guys have any suggestions for how to modify a parameter in a script or database using a text message ?

verbal aspen
mild prism
#

So I built a application that controls my propane furance in my garage. It tracks on time. Propane usage etc. The only part I'm missing is being able to actually set the temp. Currently I have to modify the script to change the set point

#

But I foraure want to have remote access. So when I'm driving home I can adjust it

#

I could make a basic mobile app. But I want something super quick it possible for now

random cypress
#

That is cool. I'd strongly recommend having the temperature control message channel be more secure than SMS.

mild prism
#

I agree. Right now this is built on a bread board. I need to switch it from running on a pi to a wireless module that's packaged in a. 3d print because I'm going to put them in ever room in my house. So right now I'm just looking for a quick solution before version 2.0

#

I would make a mobile app for version 2.0

random cypress
#

I'm not knowledgeable about the protocols that are best suited to this, but if e.g. you're running a raspberry pi, then I think a simple django site would give you everything you need (incl user authentication)

#

I hear you on the wanting a quick v1 🙂

#

The danger there of course is that v1 might work so well that you never get around to securing it

mild prism
#

Haha

#

The problem with v1 is the physical wiring ;)

#

Instead of the wireless. It's a 1 sensor only setup

#

That's probably a good way to go. A small web server

#

Definitely not something I know how to do. Lol. Time for some YouTube

astral roost
#

why not use a vpn? im pretty sure you can get free/cheap vpn solutions

#

this way, you can control everything anywhere you are

random cypress
#

I said django in particular because it gives you a lot of scaffolding right out of the box. Many good options though

astral roost
#

and your devices arent connected to the outside internet, in danger of being hacked

mild prism
#

I don't really understand what your suggesting but I am very interested lol

astral roost
#

im suggesting exactly what i said: a vpn in your home

#

in the future, if you move to something else, you can just connect to the vpn and access the webpage of whatever you need to access

haughty flare
#

the power lines work

mild prism
#

Thank you for the help I will look into that

astral roost
#

you're welcome

#

make sure you follow good practices

#

without the dislike button on youtube, it will be hard to find good tutorials on youtube

mild prism
#

Do you have a video you might recommend to get me going in the right direction ?

astral roost
#

one channel i know is networkchuck

#

but i can't recommend anything, as im not working in that industry

#

you can try buying a mikrotik switch, as those have a vpn built-in

#

i think it is free too, and you can find resources on it

#

but i can't personally recommend anything, as i could be recommending something that's not exactly the best practices

mild prism
#

Thank you. I appreciate the honest feedback !

astral roost
#

you're welcome

prime adder
#

AWS has auth services that are free if you’re doing a personal project sized thing. They also have guides to help you set it all up correctly if I recall

#

The demo I played with made it very easy to plug in to an existing app

mystic quest
#

I found something I have been looking for
https://github.com/petewarden/spchcat

spchcat is a command-line tool that reads in audio from .WAV files, a microphone, or system audio inputs and converts any speech found into text. It runs locally on your machine, with no web API calls or network activity, and is open source. It is built on top of Coqui's speech to text library, TensorFlow, KenLM, and data from Mozilla's Common Voice project.

I got it running on a pi zero 2 and it seems to work pretty well with the microphone or with audio files.

GitHub
GitHub - petewarden/spchcat: Speech recognition tool to convert aud...

Speech recognition tool to convert audio to text transcripts, for Linux and Raspberry Pi. - GitHub - petewarden/spchcat: Speech recognition tool to convert audio to text transcripts, for Linux and ...

random cypress
karmic obsidian
#

The Desk of Ladyada - 5.25" Floppy Drive hacking! https://youtu.be/opCV_4S56Ow

YouTube
Adafruit Industries
The Desk of Ladyada - 5.25" Floppy Drive hacking!

This weekend we dove headfirst into getting fluxengine and our 5.25" disk drive working with the floppy featherwing. good news is that we were able to add support to Adafruit_Floppy and with a little refactoring, add 360K disk MFM decoding. we thought we didn't have any DOS floppies but we did find one in a pile (mouse driver). we then used flux...

▶ Play video
jade dirge
prime adder
#

Hmmm now that I’m looking through their docs and refreshing my memory, I think it was only easy because the demo had you doing the API calls through another one of their services

#

If you do it that way, I think you just have to drop a sign in link AWS gives you in the page and configure some stuff and then… magic

haughty flare
#

cost me 22 for everything

random cypress
prime adder
#

Yep. So when I get around to doing some stuff around the home like this, I’ll probably set up a web front end that uses AWS services to auth and have an API put messages in a queue that my home server listens in on

noble sluice
#

oh my god

#

am i really that bad with micro controllers

noble sluice
#

ardui'no'

#

is a circuit square

pine igloo
#

Hello, I am using PubSubClient.h arduino library to publish messages to my mosquitto broker running on raspberry pi,
I am experiencing that after publishing exactly 96 messages, The Arduino stops sending message

#

i wanna know is there any sort of limit applied somewhere in that library ?

#

cause it's happening always, not just once

#

and exactly after 96messages

pine igloo
#

ok i just dubugged it a bit more and realising that entire void loop() function gets stop after looping exactly 96 times

#

when i close and re open the serial monitor it starts looping again

#

or i press the reset button on arduino

#

very weird problem, Never faced this kind of problem in the past

jade dirge
#

Sounds like a memory leak

hearty karma
#

Or a blocking queue/buffer problem.

mild prism
#

Hey guys, Im looking for a wireless microcontroller thats inexpensive that can run 1 I2C sensor and communicate with wifi to a Raspberry PI.

#

would this workout well? Adafruit ESP32-S2 Feather - 2 MB PSRAM and STEMMA QT / Qwiic

#

if so which battery would I buy to run it off of?

mild prism
#

Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh

#

does it use the same connector as the STEMMA QT?

prime adder
#

is a 60MHz oscilloscope going to be too low for learning/hobby tinkering? I see the clock speed of an arduino nano is like 16MHz, so this "times 5 rule" makes me nervous... but it could be I'll never actually be able to drive a pin at that speed so maybe it's fine

hearty karma
#

That's plenty for most uses. You'll be able to see the clock, just not as a sharp square wave (which is fine, it's not a sharp square wave to start with). Most of the stuff you'll be looking at will be much lower frequency. I got by just fine for many years with an ancient 5MHz scope.

#

This one will barely manage 100kHz, on a good day, with a tailwind, and it's non linear and has a tiny 2" screen. It's still plenty useful, 75 years after it was made.

pocketscope-2986.JPG
delicate quarry
mild prism
#

is there a more cost effective solution? Whats the difference between the variants?

#

Would the battery pack (4779) and board (2857) be plug and play with the (4210) connector?

delicate quarry
# mild prism if so which battery would I buy to run it off of?

The Lithium Polymer batteries are ideal; the Feather has a dedicated connector for it, and it comes with all the battery charging and monitoring devices built-in. It's the big black 2-pin connector on the edge of the board, separate from the Stemma QT connector in the middle.

#

Battery pack doesn't need the Stemma QT cable, only the SHT-31 needs it to connect to the Feather. Not sure if I would recommend the battery pack over the LiPo battery though; you would have to be very careful to not use the battery pack and the USB power simultaneously, as I don't see any means of disabling the LiPo charger...

#

It could get pretty bad if the LiPo charger tried to charge even rechargeable batteries, as the chemistry and voltages levels are very different, and it would be bad if it tried to charge alkalines at all...

main hemlock
#

also be careful with non-Adafruit LiPo's. Some are wired in reverse.

mild prism
#

so you would recomend this?

delicate quarry
#

@main hemlock Not that I would recommend anyone to actually do this, but the only issue with alkalines in the JST port is the LiPo charger, right? Theoretically, if I were to remove the charger chip, the rest of the circuit should work okay?

mild prism
#

does it just charge via the USB on the feather?

delicate quarry
delicate quarry
main hemlock
#

there are many with different capacities

main hemlock
main hemlock
delicate quarry
#

Haha, I already did, I was just hoping for a sanity check.

#

Thanks

mild prism
#

okay well I dont want something honky

#

so I am okay with just USB charging them

#

How would I go about calculating abttery life. I am going to use an I2C sensor on it. It mentions that in its low power mode its 80 to 100 uA. which is something like 165 days on 400mah battery pack. But I don't really know if it would always be in low power mode or exactly how that works

#

I would like something that is in that 100+ day range

delicate quarry
#

The current draw on the SHT31 would depend on how often and how accurately you try to measure, but it should average less than a milliamp of current outside of an alert state. Battery life is highly dependent on how you run it, the 400mAh could last you anywhere from 16-160 days depending on what you tell it to do.

mild prism
#

i would probably sample the temp every 30 seconds or a minute

main hemlock
#

The Feather is not necessarily designed for very, very low power operation. Some more recent Feathers allow certain things to be turned off. There are quiescent consumers like the power LED.

#

Low Power friendly! In deep sleep mode we can get down to 80~100uA of current draw from the Lipoly connection. Quiescent current is from the power regulator, ESP32-S2 chip, and Lipoly monitor. Turn off the NeoPixel and external I2C power for the lowest quiescent current draw.

mild prism
#

i guess to clerify I would have to take a measurement . Then send it over wifi to my pi

#

oh shoot i just realized on digikey the 5000 is back ordered until the end of feb

delicate quarry
#

Oh, then 160 days on a 400mAh is a bit of a stretch. I think you would be comfortable with 100+ days on a 2000mAh, but it would take some optimization for a 1200mAh battery to do the same. Deep sleep mode wouldn't be able to access the sensor over I2C or send data over WiFi.

mild prism
#

Could I put it into sleep mode then just take it to do the process then put it back into sleep?

delicate quarry
#

That is standard practice, yes.

mild prism
#

okay

#

It looks like i need an alternate to the 5000 chip tho 😦

delicate quarry
#

I don't know how the measurements would be affected, since I believe high accuracy measurements on the SHT31 rely on multiple samples and some averaging.

main hemlock
delicate quarry
#

There's 84 in stock at Adafruit, you could buy everything direct instead.

mild prism
#

Sort of. Being in canada its a much better solution. If i buy from the adafruit website it ends up more expensive. Digikey has free shipping and I won't have any duty

delicate quarry
#

Well, the alternates are a lot less convenient to use, as they either lack the battery port or something else.

mild prism
#

okay

#

well then I guess i should just buy direct

#

the other advantage of digikey is if i order today I generally have it tomorrow

#

hopefully buying direct better supports adafruit 🙂

delicate quarry
#

Yeah, Digikey's distribution network does wonders. Support is about the same, but the ESP32-S2 feather is kinda too new to have volume stock...

#

I can see if there are any other good alternates, even if it's not necessarily Adafruit.

mild prism
#

which 1200 mah battery did you recommend for the direct connection for the feather?

#

I have a couple options. I could let the board die more often and just buy extra smaller battery bank to grab from.

#

sorry i found them in the search

main hemlock
mild prism
#

so something like this

#

Lithium Ion Polymer Battery - 3.7v 2500mAh
Product ID: 328

#

I could use the same usb port to chage?

delicate quarry
#

TinyS2 is also a strong option; none of the alternates have the fancy fuel gauge, but 5029 and 4769 both support LiPo charging, Wifi, and Circuitpython/Arduino.

mild prism
#

i think i will go with ordering direct just so that I can get the optimal board

delicate quarry
mild prism
#

oh that is a good option

#

im going to 3d print a case

#

so it shouldnt be a problem

main hemlock
#

there are many projects with a case design already you could crib from

delicate quarry
#

Yeah, it even has protection circuitry built-in, so you can use it without worry, even without the fancy battery monitoring

mild prism
#

can you show me an example danh?

#

so I can use the esp32 to actually monitor the current of the battery?

main hemlock
mild prism
#

the only thing is the case would have to have alot of vents as im using a temp sensor

#

Ill probably make my own I have a industrial 3d printer at working I could make something unique

#

thank you very much for all your help. This discord channel is awesome

#

So this is what im looking at. Im going to add a screen for my PI as well. I also just ordered the GPIO pi breakout board while I am at it. Any other recommendations to grab while im making an order?

unknown.png
#

the male headers are just for testing in the future. but that 4210 should connect SHT31 to ESP32 feather right?

#

the order keeps getting more expensive lol

agile zealot
#

Does anyone here do Game Jams using CircuitPython? I'm getting into displayio and it made me realize that I'd love to see all that cool games people make in that time limit. I'm considering trying to do one later this year, so there's also that. hans

mild prism
#

Does adafruit have 3D cad for their board? iges step solidworks?

agile zealot
#

You can download the repository as a ZIP file

#

I believe there's almost always at least a STEP file, and it looks like there's typically also F3D files as well

#

F3D is Fusion I think but I only use Creo professionally and OnShape personally 😅

mild prism
#

hmm i dont see the PN 5000 esp32

#

Btw I have to tank you guys again for all your help! This discord is really amazing.

#

thank**

#

Maybe im looking wrong

#

I dont see the PN 2857 SHT31-D Either

delicate quarry
#

It doesn't include parts for every Adafruit board, unfortunately. I imagine the ESP32-S2 feather will be added in the future, but it's never been an all-inclusive list.

mild prism
#

oh okay

#

no problem I can just measureit quick and draw my own rough cad

agile zealot
# mild prism no problem I can just measureit quick and draw my own rough cad

Since the designs are open source, you can at least find the PCB files for things like measurements. If there's a Learn Guide associated with the product, you can find things like that in the "Downloads" page there. Here's the PCB file for P/N 5000: https://github.com/adafruit/Adafruit-Feather-ESP32-S2-PCB

GitHub
GitHub - adafruit/Adafruit-Feather-ESP32-S2-PCB: EagleCAD PCB files...

EagleCAD PCB files for Adafruit ESP32-S2 Feather. Contribute to adafruit/Adafruit-Feather-ESP32-S2-PCB development by creating an account on GitHub.

#

That will at least help with not having to measure overall dimensions!

icy moth
#

Feathers are 2” x 0.9”

#

Which is roughly 51mm x 23mm

mild prism
#

@agile zealot I see the board layout in the learn guide. Thank you very much

mild prism
#

For the ESP32-S2 does anyone have an example of how the wifi would work? I've never done any wifi programming before. Looking to send data between two scripts (one on a PI)

#

unless im missing something I don't see it in the learn guide

delicate quarry
mild prism
#

thank you that looks like exactly what I need

#

here is a more general question:
If i have a esp32 collecting data from a sht31 sensor. Then using a raspberry PI over WIFI to use the data to accomplish something. Would it be good practice for the ESP to write to some database or file on the raspberry PI then have the PI read the data? Or have some script on the pi that receives the data directly then decides what to do with it on its end?

#

Keep in mind I am planning on using about 20 esp32/sht31 combos

#

with 1 Pi

pulsar shale
#

Sounds like you want to use MQTT.

delicate quarry
#

I would second that recommendation. @mild prism you can look into Mosquito MQTT broker for Raspberry Pi, which essentially sets up a server on the Pi to manage all the messages from your ESP32-S2s. Then, you can setup your ESP32s as MQTT clients to publish data to your Raspberry Pi broker and manage the data that way.

mild prism
#

oh man this sounds over my head lol

#

is a mosquito MQTT a software or hardware thing

#

Oh I see a bunch of documentation. I will look into that option thank you

#

I see what it does and have a rough idea of how it works. But how would this be different efficiency wise then using something like an sql database and updating and reading a common field? Im not trying to argue. Just trying to learn more about good practices and understand what makes certain things better. I am still quite anew programmer.

delicate quarry
#

MQTT is a communication protocol, not a database.

mild prism
#

oh so the MQTT is how the information is sent over the wifi and received in the PI. Then from there you would store it somewhere

main hemlock
#

you could also send from the ESP32 directly to an MQTT could server on the internet, like adafruit.io

delicate quarry
mild prism
#

but couldnt you just do a SQL query right from the ESP32 to a remote database on the PI? I'm trying to understand better lol

#

I want to make sure going from the sensor to the PI i dont require any outside connection. So if my internet would go down everything would function still

mild prism
#

The more I read the more it seems to be a huge bandwidth savings and managing platform?

delicate quarry
#

None of this has to go to the World Wide Web if your setup is designed to transmit over your local network.

#

As long as your clients (esp32-s2) and your server/broker (pi) are on your local network, all the messages transmit through your router, but never through your internet gateway.

pulsar shale
#

It would also isolate your database from your sensor network. If you change your database you would have to update all the sensors. With MQTT you just have to update the broker.

mild prism
#

Okay. I will do it ! You have me convinced lol

#

It doesn't seem to super complicated but hopefully I know enough python to pull it off lol

#

But I guess this is all about learning ;)

agile zealot
#

Chiming in late, but if you're open to using Bluetooth, there's a library that uses it to send sensor data to a Pi that then uploads it to AdafruitIO. If nothing else, just some extra code to check out! https://github.com/adafruit/Adafruit_CircuitPython_BLE_BroadcastNet

GitHub
GitHub - adafruit/Adafruit_CircuitPython_BLE_BroadcastNet: This is ...

This is a simple BLE broadcast based sensor net. It is not secure at all. - GitHub - adafruit/Adafruit_CircuitPython_BLE_BroadcastNet: This is a simple BLE broadcast based sensor net. It is not...

#

Good luck either way!

mild prism
#

Sadly my range wont work for bluetooth

#

but i appreciatethe thought. I will look at the code.

delicate quarry
#

Esp32-s2 has no Bluetooth to make use of this, either. You would need to use a different board…

steady kite
#

something interesting i noticed.. there is a electric fence around the house.
everytime it triggers the clock in our kitchen does as well.

#

it's in perfect sync

outer brook
#

Is the clock synced to local AC frequency?

#

That's a thing that exists

hybrid bluff
#

Hi my my raspberry pi zero wh keeps overheating and almost burning me what should I do

verbal aspen
# hybrid bluff Hi my my raspberry pi zero wh keeps overheating and almost burning me what shoul...

You could add a little heatsink: https://www.pishop.us/product/aluminum-heatsink-for-raspberry-pi-zero/

PiShop.us
Aluminum Heatsink for Raspberry Pi Zero

American Raspberry Pi Shop. One stop shop for all your Pi needs. Raspberry Pi add-ons, HATs, accessories, Starter Kit, Media Center kit, RetroPi Arcade kit, Ultimate Kit, and many other project kits. PiShop.us is approved Raspberry Pi re-seller and carries all official Raspberry Pi boards and products.

humble thunder
#

For when you need a breakout right now and not in a few days

#

Only thing is that you have to be fast with the iron or the plastic gets sad lol

humble thunder
#

oooh, new product idea: MicroSD QT Py BFF, a little board to fit onto a QT Py that just has a MicroSD card slot on it wired in SPI mode

winged sphinx
#

Anyone participating in the Growing Beyond the Earth challenge from NASA?

teal wadi
steady kite
#

no when the electric fence triggers the EMF trigger the clock 5 m away

#

the timing is 1:1

verbal aspen
#

He's asking what you mean by the clock "triggering"... does it reset to 12:00, does the display flicker, does the alarm sound, etc.

teal wadi
#

I think they mean that the clock "loses time"

#

In which case I would agree with @outer brook, in that it measures time based on the AC frequency, and slight changes in frequency can impact the clock

#

Microwave clocks, flip clocks and similar devices tend to use AC power as a timing source

steady kite
#

@verbal aspen ever seen a analogue crystal clock?

#

the emf is so high it triggers over the crystal

#

i got attacked my a pitbull on the street today, my right hand looks like swiss cheese