microcontrollers

[elfin sphinx]

what i meant is stuff like online blogs , youtube videos , maker sites , etc etc etc

but sure , there are communities for this stuff on discord too

there is the official arduino server, and bunch of other electronics/embedded related servers

there are some reddit communities too

[bitter swallow]

oh nice good to know

is there a significant gap between them?

as someone who never touched, I see it as simply attaching wires and coding

there's more to it, which i have yet to know

i was going to choose adruino after light research, esp32 looks cheaper

i have to rethink

[elfin sphinx]

the ESP32 has lots more stuff like wifi , bluetooth , much faster processor and stuff
its a little bit unnecessarily complicated for a beginner

[elfin sphinx]

well it would depend where you are looking , here i can get an arduino UNO cheaper than an ESP32

dont try to buy the "original arduino board" , its VERY expensive because its geniune board ( like $25 )

because arduino is open source, chinese manufactureres have copied its schematic and made countless clone boards ,you can get these boards for a fraction of a price ( usually around the $3-4 mark )

you could ( and should ) get both boards imo

start with arduino UNO , get familiar with simpler stuff

then when you are ready to play with stuff like wifi and such , move on to esp32

[willow star]

Are the cheap clone boards (at least mostly) as good as the original? In the sense that it works ok, you can use the same Arduino IDE and the same code?

[bitter swallow]

technically it's not that expensive
I'm in first year college and want to start being independent on money. With what i have i can buy only one of either boards, although i could easily get both of them if I ask dad

amazon shows adruino as $5 more expensive

[elfin sphinx]

yep , its the exact same working wise

the clones are cheaper because , firstly they are made in china , and secondly because they might not be using the highest quality components , so for long run the reliability will be different
but for all intents and purposes , the clones are just fine , i have only ever used clone boards except when they provided us the "genuine" boards in college
difference is mostly just in terms of PCB color difference, components looking a bit nicer and everything , functionality wise , they are pretty much identical
yes, you can use the same IDE , the exact same code on either and it wont make a difference

if you are curious about the difference between them , i think the arduino server has a thread or a post or smth about this topic

[elfin sphinx]

i cant even remember the last time i bought electronic components from amazon

amazon sellers price their stuff terribly , you should use a more electronic focused site

firstly take a look at your local electronic shop , see if you find it there , if not , check for local websites , if not then there are sites like mouser, digikey , adafruit , etc
and last but not least , there is always aliexpress

[elfin sphinx]

well you cant do much with just arduino UNO on its own

you will need other stuff like breadboards , wires , LEDs

[willow star]

Oh, thank you very much for this answer!
That's good to know 🙂

[elfin sphinx]

if you are that tight on budget , then sure ig , buy an ESP32 , its not a bad option either , just not what i would recommend a beginner to go with

(you will need stuff like breadboard and wires either way btw )

[bitter swallow]

i was looking at kits, microcontrollers itself aren't much

wait a minute

[elfin sphinx]

kit is what i would recommend too

[bitter swallow]

i can buy a kit for one

and just the microcontroller for other

[elfin sphinx]

yep

[bitter swallow]

the electric components would work same way with both right?

[elfin sphinx]

yep

[bitter swallow]

cool good to know

are electrics from amazon generally lower quality or anything? it's my first time hearing other sites you mentioned (not aliexpress), I'll take a look at them

I'm not aware of any shops nearby that provide microcontrollers, let alone the kits

[elfin sphinx]

the main reason i dont buy from amazon is because stuff is very overpriced

sellers just straight up double or triple the price of simple stuff

ex , a pi pico W would cost me around $6 on a dedicated site , but on amazon it could be upwards of $12-14

and sure , since everytime you buy components from amazon , you are probably buying from new sellers , so everytime there is qeustion of "is this seller good or not"

but with dedicated website , the seller is always the same , so after ordering once or twice , you know if a site is good or not

amazon stuff is not necessarily low quality , its just overpriced

[elfin sphinx]

a kit is just collection of different components , you could also just buy them seperately if you wanted

[bitter swallow]

am i looking at the right thing?
it says "compatible with arduino" rather than arduino itself.
is it one of those clones u mentioned?

[elfin sphinx]

yep , looks like an arduino

compatible with arduino usually means clones yeah

[north badge]

uno 3

[north badge]

use the nano

[elfin sphinx]

i dont recommend nano , uno and nano are pretty much the same nano is just smaller in size

but UNO will be better since you are just learning , it supports the shields that you can buy which the nano wont

[north badge]

i get you

esay plug

[bitter swallow]

i already put up with learning easy ones while I usually start with most complicated

no thank you

[remote storm]

Hey man

You there?

[elfin sphinx]

kinda , whatsup ?

[remote storm]

Heyyyyyy

[remote storm]

Can you come into dms bro?

[remote storm]

I am good haha wby?

Long time

[elfin sphinx]

i would prefer keeping it in the server 😅

[remote storm]

Alr

[elfin sphinx]

more people , more chances of help , more eyes to fact check if i say something dumb

[remote storm]

So i am planning to build smthg different this time lol(totally not an arcade controller)

[remote storm]

So have you seen those tv backlights that sync with what happens on the screen?

[elfin sphinx]

i have heard of those yeah

[remote storm]

Is that possible with an arduino or a raspberry module?

Like i have the rgb strip

Its just lying there so i thought i would build smthg with it haha

[elfin sphinx]

with a raspberry pi , yeah
not sure about arduino

tbh i am not sure how those things work , how they understand what color is on what part of screen and so on
ill have to check

its like 2AM and i am about to crash , remind me tomorrow, ill check

[remote storm]

So basically i asked gpt. And it says it takes the input through hdmi, then it looks for the pixels at edges then it just picks up that and changes colors accordingly

[remote storm]

Sure sure

[remote storm]

I got into uni btw. Pursuing BCA 😃

[elfin sphinx]

nicee, good stuff 🔥

[remote storm]

Hell yeah man

[remote storm]

Heyyyy

Wassup

Any info on that?

[elfin sphinx]

not really 😅

from what i found , one DIY project makes use of a raspberry pi and USB webcam to check the colors on screen
but it seems a bit overkill to me

imo , an inline circuit that takes the HDMI from PC as input , extracts the color info from that and then outputs the HDMI signal as is
which sounds complicated to me , unless there exist some module for this on somewhere

on second thought , maybe you can incorporate something like HDMI splitter which will split the input coming from video source , then send one of that to TV as is
and send second of that to your raspberry pi using some sort of USB capture card or smth

TLDR , getting the raspberry pi to recognize the colors on the TV is the hard part , lighting up the LED strip accordingly is the easy part

[remote storm]

I see

Thanks alot man

Thats a really crazy amount of intel

A question tho, which raspberry pi module do i need and how much will it cost?

[elfin sphinx]

i would like to think that a rpi zero 2 w can do the job , which would cost smth like 1500-1600 INR

but i am not 100% sure if the pi can handle all that stuff llike video capture and all, it can get pretty heavy depending on monitor resolution

so i would suggest something upwards of rpi 4 , 4 gig RAM which can cost around 5k INR

[remote storm]

So i asked chat gpt abt the same

It recommended a raspberry pi zero 2 or 3 model B+

But it added a note that if i plan to use the cheaper zero 2 i must use a capture card along with it

To make it more efficient

It cant handle it lol

💀

[elfin sphinx]

honestly speaking , i dont give a crap what GPT says , it a toy AI at the end of the day

[remote storm]

Real

Hope it doesn’t advance that much in next 5 years

😭🙏🏻

[elfin sphinx]

you would need to capture the video stream with a powerful pi too like a capture card

[remote storm]

I see

[elfin sphinx]

the HDMI port on rpi is for output , not input

[remote storm]

Any raspberry pi alternatives which are cheaper ? You know me lol i am broke 💀😭

[remote storm]

Ohhh yeahhh

Right

You did mention that earlier

Mb

[elfin sphinx]

maybe orange pi ? i am not really sure

any cheap SBC that is powerful enough to handle the capture card should be fine

[remote storm]

My plan is to make it under 3.5k

Lol

[remote storm]

I see

[elfin sphinx]

probably not possible with current approach

i am sure you can buy direct products that will do this though for cheaper

[remote storm]

Yeah

It costs like 4-5k to buy the same thing and like 15k for a really good one

I was like imma try to make it cheaper haha

But ig not everything can be made real haha

Imma still try it with raspberry pi zero 2W

[elfin sphinx]

if the rpi zero 2 w can handle the load, your plan would work

[remote storm]

If it fails well i will just make other projects with it

And play with the board

Its a win win lol

😂

[remote storm]

Any micro controller servers you are in? Like where i can review ppl abt it?

Or lemme check discord list lol

I think i can find one with appropriate tags

Ohh damn lol

Cant post here

Can you send in dms pls?

[elfin sphinx]

sure

[remote storm]

Thanks man. You are G

[elfin sphinx]

( if any mod is reading this , maybe you can whitelist the links i sent here that were deleted ?? They are legit electronics communities . I would open a modmail to get them added, but my old one is not yet closed so i dont know what i am supposed to do there )

[radiant oriole]

Hi, This is Sayed.
Im working on pymodbus simulator; i having some problem, Anyone can help me?

[elfin sphinx]

dont ask to ask

just ask your question directly

[cloud hinge]

What's the issue?

@elfin sphinx are you familiar with ble coding and raspian?

[elfin sphinx]

not much really 😅

[cloud hinge]

ok, What's your specialty focus with microcontrollers?

@elfin sphinx good morning

I spent all yesterday trying to write code with ai to get cool functions but only got a couple working but working good

[elfin sphinx]

not much of a speciality , i just learn whatever is required lol

[cloud hinge]

Nice

[elfin sphinx]

if we talk about stuff i like , then its the embedded stuff , i dont like doing simulations , designing analog circuits and all

unless its for some project i want

[cloud hinge]

Yeah I hear that, I'm more hands on then simulations but I do see there benefit. I've tried wow wiki and I like it

@elfin sphinx do u know much about services and triggering or starting a python .py file? I'm trying to start from bt but the services don't work in bt pairing on some libraries

[errant wigeon]

Modmails get closed in a variety of ways, and multiple threads/topics in a single modmail are not an issue. It's a communication vector so don't worry about having multiple topics in a single thread unless we ask for managing things on our end. If those servers are servers you think are worth adding, go ahead and open a modmail with them, though we audit the server and sometimes conclude that for some reason or another it's not something we can whitelist

[errant wigeon]

could you elaborate on what you're trying to do? Bluetooth in python is a difficult thing because the hardware stack is often weirdly supported. What is the python script you're trying, and what services aren't working (and which ones do so we can compare)

[elfin sphinx]

you mean you want to launch a python file on your PC from a device that is connected to your PC via BLE ??

[elfin sphinx]

okay 👍

[cloud hinge]

Ok the cats out of the bag, I'm trying to program esp32 to a rotary encoder just to use the button on pin 21 to pair with with rpi4 raspian os. I've got it to pair with blekeyboard and blemouse but bleserial library it won't pair. Raspbian says no services can be used on this device with blueserial library. I have a bunch of scripts made to test with mixed results. Script to shutdown says awaiting connection but when I send for instance 000 I want the script to connect to turn off rasspbian os. If I run command in terminal it works to turn off pi. I was also able to make wheel of mouse work on pi with rotary but I thought it would be nice to have a bt wireless power button. Seems related to bleserial. I've used ble serial for other projects successfully but to some reason I get the services issues with that library

[cloud hinge]

Could be pc or rpi4 or any os, I'm focused on rpi4 at the moment. I got close last night. Its just annoying to make the 4 clicks to power off pi when potentially I could use one button wirelessly to do that easier. I have serious neck back and arm pain so some days it would be nice to one click to turn off from across the room or something.

[elfin sphinx]

tbh i dont understand what you are trying to do

till now i havve understood that you have a rotary encoder connected to your ESP32 , and you wnat to connect your ESP32 via BLE to any generic computer

my question is , what do you want to do after the ESP has connected to the PC ??

[cloud hinge]

Just a esp32 button to basically to turn off rpi4 after pairing. sending command to .py script from esp32 with a trigger to script that's listening to shut computer down. using the button on the rotary encoder for now as the button on pin 21. Have to run some of the things in vemu. Basically just shut computer down software wise with one click wirelessly

[elfin sphinx]

you can have your ESP32 be a BLE keyboard , and then when paired you can click the button and , it can send key strokes that will open a terminal and issue the shutdown command for your OS

[cloud hinge]

That's a good aproach, ill try that. Genius, Thanks Saul

[radiant oriole]

I'm using pymodbus simulator to generate modbus data from a csv file,
i have msp430 based microcontroller, which has been designed with rs485 modbus. From MSP430 micrcontroller it sends request "sending 58", pymodbus receive it and reply the value:
thats the thing.
Problem is : Pymodbus has "frame not ready" message and it cant send to Microcontroller.
Not pymodbus simulator sends it through rs485 modbus module, and micrcontrollers A+, B+ GND pin connected with that pymodbus rs485 module.

[cloud hinge]

I never seen the project done wirelessly so I thought it would be a fun challenge

[elfin sphinx]

no worries

in ubuntu , you need to send ctrl + alt + T to open a terminal , just find the equivalent keystrokes for the same in raspbian OS
then once the terminal is open , you can send poweroff and then enter key

that should 🤞 shutdown the PC

[cloud hinge]

Yeah ok, I should be a able to time the words with same button after opening the terminal to shut down I think, I think there's a good shot that will work. I was able to get 000 sent at once so multiple things from one button might be possible. Also if I can skip the python file that is less things to deal with

[elfin sphinx]

the button press is just a signal for the microcontroller to lets say execute a function
you can write whatever you want , however long prompts / commands you want in this function

[cloud hinge]

Yes thanks for that clairification. I'm familiar but I do get confused, makes perfect sense

[cloud hinge]

@elfin sphinx thanks man it worked flawless, I really appreciate the help. Now I'm wondering best safe way to power up rpi4 with with esp32 and relay but have a safety feature that makes it so Running os system can't be turned off while on without a system overdue for crashes or freezes if needed

[elfin sphinx]

well , you cant really use the RPI to turn itself on when its off , right ?? cause there would be no BLE connection

and i am not sure what you meant by the safety feature

[cloud hinge]

Can if you had a dedicated esp that senses somehow if os is on. Could use esp now perhaps. Safety cause u don't want to abruptly turn off computer while os is running. Don't want to corrupt anything. It would be a smart sense that only powers off relay or what not when os is not running, so could have a over ride in software. Like a wireless esp screen to both ble on rpi and and WiFi on the other esp32 to receive comands

[elfin sphinx]

what ??

how would you turn on your rpi using ESP32 ?? the rpi is off , who will control the relay ??

unless you are talking about attaching another esp32 to the pi that will do the communication ??

( which sounds unnecessarily complex to me tbh )

if your pi is connected via LAN to your router , you could use the Wake On Lan protcol to issue a wake up command to your raspberry pi using any other device on the network

[cloud hinge]

Yes another esp32.

[elfin sphinx]

so there wont be a BLE connection between the ESP remote in your hand and the raspberry pi itself like previous ??

[cloud hinge]

That makes more sense bit can't completely power down

[cloud hinge]

Yeah it would have the same ble but power on off from relay would be done from WiFi protocol to free up the ble for only powering off via software the same way

oh wait your right

[elfin sphinx]

its an ultra low power state , i am pretty sure the consumption during that state will be much much less than your ESP32's power consumption

ESP32 while communicating over wifi can take anywhere from 150 to even upto 250 mA

[cloud hinge]

Hmm. Esp on lan could be ultra deep sleep perhaps

just brainstorming on feasiblity. Maybe someone could have real use cases for it. I don't know if ill make it but great to think things out, thank you

I think wireless might be more finicky for deep sleep esp wifi

[elfin sphinx]

not sure what you mean by this

[elfin sphinx]

i am confused
one time you are saying that you need the BLE to happen , now you say you want to free up BLE , which one is it ??

for the wake up feature , there doesnt need to be BLE connection between your ESP and rpi , only conditino is that RPI and ESP should be on the same wifi network

[cloud hinge]

Deep sleep to put esp32 into low power mode to take up least amount of energy but still able to receive packets for turning on and doing things then getting tired and going back into a deep sleep

[elfin sphinx]

you cant put ESP in deep sleep and still receive wifi stuff
you need to put it in "modem sleep" or smth similar
the current consumption will reduce than usual , but its still there , maybe you could bring it to 100mA from 200mA , but it will still consume lot of current
(unless that mode is supported in light sleep too, in which case the current will be even lower , but i dont think light sleep supports that )
we usually dont pay much attention to it but ESP32 in normal operations is a VERY power hungry device

[cloud hinge]

WiFi is more power hungry than lan I think. Ble for rpi4 direct software connection for turning off only, WiFi from one esp32 to the router that connects over to the lan of other esp32 that has relay for rpi for power rpi on or off

[elfin sphinx]

not to mention that power saving with ESP32 is a vast topic and is tricky to get right

[elfin sphinx]

if you wanted, you could use the wifi for turning off too , but it will be a bit more complicated , you will have tto setup a small webserver on rpi that will listen for some sort of communication , then once it receives the turn off signal , the backend code will issue the shutdown somehow

[cloud hinge]

I'm going based off memory, my apologies. I don't have the sleep data In front of me. I haven't used any of the sleep features myself, just seen a bunch of vids on them

[elfin sphinx]

its complicated to make and hair pulling to debug if you want to save as much power as possible

[cloud hinge]

So true

[elfin sphinx]

how would you know its soo true if you havent even tried it 💀

anyway , those are the options

the ESP32 + relay is possible too , just the sleep part is hard to get right

[cloud hinge]

I'm visualizing lol

[elfin sphinx]

if you want to know about the " if the rpi is on or not before shutting down" , you could maybe read the status of the green LED that is on the board of the rpi

or maybe you could hook up some wire to some GPIO that spits out data when system is running or smth

[cloud hinge]

I don't know if I'd trust my rpi to relay so would test on something else first

[elfin sphinx]

i am not sure about the exact details , but it should be totally possible to detect if the pi is on or not

[elfin sphinx]

sure , upto you

i would suggest you get a relay module btw , and avoid using a bare relay

[cloud hinge]

Software I was thinking that only sends when os is running

[elfin sphinx]

not sure what you mean

" software i was thinking that only sends when os is running"

what software ? running where ? sends what ? through where ?

[cloud hinge]

have the software blink a gpio port so esp32 could detect it? Some code or what not that auto runs when os is booting?

[elfin sphinx]

wait , why do you want to know if the OS is running or not before turning off ?

the way you turn the pi off is via BLE right ? so if there is a BLE connection , you would know that the os is running

or are you referring ot the future project that you are gonna make with the relay ?

[cloud hinge]

so when pushing esp32 button on accident u don't shut off rpi without shutting down properly

[elfin sphinx]

how would you "shut down properly" using your esp32 ??

lets say , you want to shut your PC down , and it is currerntly on , what do you do and what do you want to happen ?

[cloud hinge]

with the one click way I made earlier with your help

I made it to schedule for one min shutdown

[elfin sphinx]

so for that command to work , the pi has to be on , otherwise it wont work

so when you are issuing that command , you kind of know that the* pi is already on

[cloud hinge]

Hte?

I see nm

[cloud hinge]

Yeah but maybe there is another way

a better way

[elfin sphinx]

you are confusing me a lot

[cloud hinge]

My apologies

[elfin sphinx]

maybe post your requirements , types of connections and every last detail about what you want to do ( write it considering that new person helping has 0 knowledge about what you are doing , so you should explain to them in as detail as possible , starting at the start )

someone will help you , or maybe ill take a look later

[cloud hinge]

Thanks man, ill keep that in mind. Your more than welcome to do a write up on it if you find it worth while. When I get a esp32 with touch screen built in I think ill be able to do a lot more cool features like this integrated into touch screens

[willow star]

Wow, a microcontroller with a touchscreen sounds very cool, I'll need to look into that
Or just working with screens in general

[cloud hinge]

They have come a long way in features, so many good videos on yt also look up cheap yellow display

[stone grail]

Hello I use a raspberry pi Pico and I would like to code it using micro py but I wasn't able to find an optimal IDE, I would appreciate having some suggestions.

[elfin sphinx]

Thonny is a fantastic IDE
that is what i use personally for my micropython and circuitpython projects

[quasi hare]

Anyone here knows how to connect HTML to raspberry pi? I want to fetch data from the board and display on the frontend using HTML and then this shud be deployed on server running on raspberry pi. I'm using mqtt protocol

[cinder crow]

Im kinda lost
Which is the correct channel for Machine Learning stuff?

[elfin sphinx]

#data-science-and-ml this one

[elfin sphinx]

HTML is not something that you can "connect"

I want to fetch data from the board
what board ?

you can make a webserver using something like django or flask in python that can serve HTML files

but for live visualization , you might need some javascript as well

also , how "live" is the data ?

[quasi hare]

Let me explain the concept to you. I'm using a microcontroller, specifically the Wiznet W5500 EVB, which will send data to your website or HTTP server. This data will indicate whether the band and mat are connected or not. So, the website you're creating needs to function as a client for my device. I'll be sending information via the TCP/IP protocol, and you'll need to receive it as the client.

Additionally, we need to add a page for new devices where we'll input an IP and port. If the connection is successfully established using this IP and port, the status of that device should be displayed on our main page

Using the second method for message transfer via MQTT, we need to create a webpage on our Wiznet W5500 EVB. This means that when you enter the device's IP and port into a web browser, a page will open. On this page, there should be two boxes labeled "MQTT ID" and "Port Name." When I enter the correct MQTT ID and port, the connection with my MQTT server will be established.

But where the MQTT ID and port we provide on this page will go needs to be defined in the device, meaning in the MicroPython code.

this method we use for configuration of our device

Actually we are using wiznet w5500 evb module, Yess it has inbuilt ethernet module , actually it is based on rp2040

We can say it is a combination of ethernet w5500 and rasberry pico

rasberry pi we use here only for data collection from ESD  Device

import network
import machine
import time
from umqtt.simple import MQTTClient

def w5500_init():
    nic = network.WIZNET5K()
    nic.active(True)
    nic.ifconfig('dhcp')
    while not nic.isconnected():
        time.sleep(1)

def connect_mqtt(server, port, client_id):
    client = MQTTClient(client_id, server, port)
    client.connect()
    return client

def is_band_connected():
    band_status = machine.Pin(11, machine.Pin.IN).value()
    return band_status

def is_mat_connected():
    mat_status = machine.Pin(10, machine.Pin.IN).value()
    return mat_status

def main():
    # Initialize W5500 module
    w5500_init()

    # MQTT Broker details
    mqtt_server = '192.168.1.14'
    mqtt_port = 1883
    mqtt_client_id = 'YOUR_MQTT_CLIENT_ID'

    # Connect to MQTT broker
    mqtt_client = connect_mqtt(mqtt_server, mqtt_port, mqtt_client_id)

    try:
        while True:
            # Check Band status
            if is_band_connected():
                print('Band connected')
            else:
                print('Band disconnected')

            # Check Mat status
            if is_mat_connected():
                print('Mat disconnected')
            else:
                print('Mat connected')

            # Publish Band status to MQTT
            topic_band = 'topic/Band_Status'
            message_band = 'Band connected' if is_band_connected() else 'Band disconnected'
            mqtt_client.publish(topic_band, message_band)

            # Publish Mat status to MQTT
            topic_mat = 'topic/Mat_Status'
            message_mat = 'Mat disconnected' if is_mat_connected() else 'Mat connected'
            mqtt_client.publish(topic_mat, message_mat)

            # Delay for 1 second
            time.sleep(0.1)

    finally:
        # Disconnect from MQTT broker
        mqtt_client.disconnect()

if _name_ == "_main_":
    main()

this is the micropython code which I already used in our device which use mqtt protocol for communication

[random thicket]

I don't know if this is the best server to ask this, I have a raspberry pico and I'm trying to use a HMC5883L but I can't read the i2c.

[strong pine]

there exists a fairly active raspberry pi server

[elfin sphinx]

i am still kind of confused tbh

i am not sure what you meant when you said

This data will indicate whether the band and mat are connected or not. So, the website you're creating needs to function as a client for my device
"as a client for my device" , what device ? what do you mean by client ? in a server client architecture , server is the one sending http to the client , and client is the one requesting the http , not sure what you meant by that . also what is a "band" and a "mat"

also "second method for message transfer via MQTT" , i am not sure who is communicating with who , i am not sure what all devices are present in your network , i am not sure who wants to talk to who

can you maybe explain your project and then we get an idea of what you are trying to do ?

[elfin sphinx]

cool
do you need help with that , or you just wanted to let us know that you cant get it to work ??

if you need help , you are gonna need to send lots of information like , your code , your error(if any) , your circuit diagram , a photo of your actual setup

[quasi hare]

yup, I used flask

By live, I meant the statuses should be updated in real time

this table should get filled up dynamically

[elfin sphinx]

i still have no idea how this table should g et filled up , where the data is coming from , what all devices youy have in your netowrk
i assume the connection protocol between your node devices is mqtt , then who is the mqtt broker

also i am not sure what is all the ip addresses and ports in here

[elfin sphinx]

please clarify the stuff asked here so we better understand what is going on here

[quasi hare]

yup will do 👍

[random thicket]

@elfin sphinx thanks for the reply. yes, I do need help. I just wanted to make sure this was the correct place before spamming code and photos.
this is the code i use to scan for i2c devices
`import machine
sda=machine.Pin(16)
scl=machine.Pin(17)
i2c=machine.I2C(0,sda=sda, scl=scl, freq=400000)

print('Scan i2c bus...')
devices = i2c.scan()

if len(devices) == 0:
print("No i2c device !")
else:
print('i2c devices found:',len(devices))

for device in devices:
print("Decimal address: ",device," | Hexa address: ",hex(device))`

the output was.
Scan i2c bus... i2c devices found: 1 Decimal address: 13 | Hexa address: 0xd

I then followed this guide https://how2electronics.com/interfacing-hmc5883l-magnetometer-with-raspberry-pi-pico/

[elfin sphinx]

cool , so what did you need help with here ?

it looks like the code is detecting your magnetometer on I2C bus just fine

[random thicket]

@elfin sphinx When I try to read I only get 0,0,0
this is one of the codes i tried to use

`from machine import Pin, SoftI2C
import math
import time
import struct

i2c = SoftI2C(scl=Pin(17), sda=Pin(16), freq=100000)

declination=(0, 0)
i2c.writeto_mem(0xd, 0x00, struct.pack('B', 0b111000))
i2c.writeto_mem(0xd, 0x01, struct.pack('B', 1))
i2c.writeto_mem(0xd, 0x02, struct.pack('B', 0x00))

declination = (declination[0] + declination[1] / 60) * math.pi / 180

data = bytearray(6)
xs=1
ys=1
xb=0
yb=0

while True:
i2c.readfrom_mem_into(0xd, 0x03, data)

x = (data[0] << 8) | data[1]
y = (data[4] << 8) | data[5]
z = (data[2] << 8) | data[3]

x = x - (1 << 16) if x & (1 << 15) else x
y = y - (1 << 16) if y & (1 << 15) else y
z = z - (1 << 16) if z & (1 << 15) else z

gain = 1

x = x * gain
y = y * gain
z = z * gain

x = x * xs + xb
y = y * ys + yb
print(x,y,z)
time.sleep(1)`

[broken python]

hello everyone , i need help guys who have a public http serveur and can host in the this serveur a bin file
i work in OTA update using gprs, the sim800L module dosen't support https protocole

[spiral sandal]

you should find what you need on http://sdf.org/ or pythonanywhere.com

[errant shell]

If you want to show historical data, then you must store the data in a database. Device -> MQTT -> (broker) -> data receiver -> database
Then from the browser. HTTP request -> flask web server -> database -> HTTP response

If you do not need historical data, then you can enable MQTT over WebSockets in your MQTT broker - and let the browser JavaScript listen directly for messages using WebSockets

[quasi hare]

Thanks

[bitter swallow]

hello

is it possible to code arudino with python or just c++?

[errant wigeon]

the pinned post has links to some information regarding that, but loosely it's mostly just arduino c/c++

[bitter swallow]

thanks for the info!

[vestal surge]

I think it depends on your Arduino. Mine supports micropython so I can code with python, but I'm not sure if all do.

[bitter swallow]

does it depend on the model or other properties? I have the uno r3

[vestal surge]

I believe it's the model. It should say online somewhere if it's compatible. I have the nano rp2040 connect

[elfin sphinx]

Arduino is a bigg company
they make A LOT of development boards , some of them are powerful enough to run micropython , a lot arent

so whenver you say stuff like this , its important to include what model you have , instead of saying just arduino as it can confuse a lot of other people too

[elfin sphinx]

the UNO R3 cannot run micropython or circuitpython
you are stuck with C/C++

[elfin sphinx]

is there not a library / driver for this module ? i am not sure why you arent using that

[random thicket]

@elfin sphinx thanks for the help I will be trying to solve this on my own 👍

[bitter swallow]

I'm not disappointed or anything, it would simply be easier with python I presume.

How about esp32?

[elfin sphinx]

well , you can "control" your a rduino with python using something like pyfirmata
but you cant write code on arduino using python or any derivatives like micro/circuit

ESP32 can run micropython and circuitpython , yes

but the methods to set the board up might vary slightly depending your exact ESP32 model

[short crane]

Hello y'all, i don't know if this is the best server to ask this question. I'm new to programming with python(about 2 months), i have a dream project i will love to build which is a smart farm. This smart farm will have features like automatic feeding, watering and individualized animal tracking for optimial care-giving, i have no experience in technology before now (coming from medical background). what technology should i be looking to learn and what is the path of study for a project like this?

[errant wigeon]

Do you currently own a farm and have livestock, or is this a project idea you have?
If you own a farm I'm going to suggest you go with a professional product.
If it's just a goal you want to work towards, automated plant watering is a good place to start: it involves a lot of the same concepts as building blocks, gives you some experience with automation, tracking, hardware, electronics, etc, and 'failure' is a dead plant, not an animal so you can also learn about reporting/warnings in a 'safer' way

[short crane]

Thank you for your reply. No i don't own a farm, i'm curious about the technologies and i belive a project like that is a good way to learn it. What is the roadmap you will recommended for a project like this?

[opal forge]

Did anyone here ever run some kind of user inteface using kivy on raspberry pi?

Is it possible to run It in docker and do I Need desktop version for that?

[elfin sphinx]

technically you dont have to have the desktop OS , you can manually install the X server and configure it , but imo its a bit tidious
if you have a powerful pi ( pi 4 or 5 with 2 gig or above RAM) , you can run the full desktop and a GUI app on top of it imo

if resources are important , then you could set up the X server only and go from there

[elfin sphinx]

every individual thing you mentioned is a "thing" on its own
there is not really a fixed "roadmap" for these kind of things

just plan out main stuff you want to do , and then work on those individual things, ex lets say you want to set up a smart farm that 1) feeds and waters the animals periodically 2) does Individualized animal tracking

also i am not really sure how you would "feed" the animals ??
lets say you have a machine that feeds the animals on command

now depending on how "smart" you want this to be , the technology used will be different.

ex . it can be as simple as programming it to feed and water animals at fixed time of the day
now to enhance this , you could add a weight sensor to the spot where you will drop its food , this will measure the weight of food and you can estimate if the animal is eating the food or not
this could be fooled if some other stuff falls ont hat spot and adds weight on the weight sensor ( so the food will be finished but the sensor will show that the food is still thre)
to overcome this ,you might use something like computer vision or something similar

so you see , the complexity goes on increasing the more you want to enhance it.

also "automate the farm" is a bit of vague subject and i am not really sure what part you want to implement yourself vs what part you want to just buy ready to go

ex - lets talk about monitoring the cattle.

there are number of ways you could go about it with their pros and cons
such as geofencing the cows using a GPS tracker or smth similar

now i am not sure if you are interested in building this GPS monitor yourself or you want to just buy one that is ready to go and then use these hardware components and write software for them

if you are really not sure what you want , but want to get into all this "electronics stuff"

my advice is , just buy an arduino kit and start doing projects that you see online that interest you
(ex - a good beginner project for you might be arduino based automatic plant watering system )
and try to learn new things, thats pretty much all i can say to you

there is not really a fixed roadmap for this kind of stuff like there is for say learning a programming language

the only "roadmap" i know of is doing engineering in electronics or similar branch

[short crane]

Thak you Saul Goodman for that out time from your precious day to send me this reply, as you advised i'll start by drafting what exactly i want in this smart farm and begin with arduino.

[elfin sphinx]

👍 having a fixed set of features you want and requirements will really allow you to make quick hardware choice

also i think the farm should be the big goal you walk towards

but you should start with simple stuff in the beginning

otherwise you might just get overwhelmed

[opal forge]

I have a question not related to python but how do you secure your code from being stolen?

[spiral sandal]

you open source it, put a permissive license on it and then it cannot be stolen, and probably will live way longer

a part from that there are a number of SOC which allow for burning some fuse and set crypto/tpm at a very low level

[opal forge]

And what about welding parts? Like emmc into controllers

Also what about storing some kind of device ids/API tokens

I want to primarly make them secure

[spiral sandal]

you want SBROM and encryped storage ( nand/emmc can be dumped easy )

you can experiment for cheap with allwinner socs you can burn fuse from usb/fel mode you will find docs on https://linux-sunxi.org and armbian forums

[opal forge]

What do you mean by "you can burn fuse from usb/fel mode"?

[spiral sandal]

i'm not advertising, but all allwinner socs can boot via USB and you can have uboot interacting with very low level functions https://linux-sunxi.org/FEL/USBBoot . That made those socs unbrickable and so very good for beginners , though messing with e-fuse and crypto you could probably lock you away if you lose the key

[opal forge]

I Kindly dont understand what are all allwinner socs and what exactly are they?

[spiral sandal]

system on chips you can find on dev boards like "orange pi" , "Libre Computer" "lichee pi" etc ...

[opal forge]

Okay now im reading more about It, but will this make it safe from being accessed by other peoples ( even if the device has been stolen )?

[spiral sandal]

from most people yes

[opal forge]

Okay, im reading more and more about it and it starts making sens but i still dont understand than
where the encryption keys will be hidden to make it safe?

[spiral sandal]

inside the cpu there are a bank of fuse you can shortcut and burn to make a bitstring that is hardwired forever and make the chip unique

and this is not readable outside internal boot process https://www.linaro.org/blog/uefi-secureboot-in-u-boot/

only write once

[opal forge]

Okay, so even if someone would try to access this "key" stored in cpu by using other micor sd he wont get access to it?

[spiral sandal]

indeed they cannot, so don't loose the key yourself

[opal forge]

Okay, but for what should i remember tha key myself? Do i need to input it each time the device is booted

?

[spiral sandal]

you need the key to make a trusted encrypted FS image or the cpu won't boot anymore

it will only allow stuff signed for it

[opal forge]

Okay, thx for your help im going to start reading about it

[quasi hare]

yeah, I did the websockets one and it worked, thanks

[iron umbra]

How tf do I understand coding for microcontrollers😭

I have this uni project due for traffic control and pedestrian crossing and it’s eating me already

[quasi hare]

wats ur issue?

[iron umbra]

I want to start by building my basic fundamental knowledge on these things. Where should I even start?

[elfin sphinx]

what are you studying in UNI ?? CS ? electronics ? like which field ?

[iron umbra]

It’s a first year general engineering course. One of them is an electrical engineering unit

Called smart systems

Coding an arduino is going to be the end of me

[spiral sandal]

start by arduino led blinking ( and for handeld games start with pong 😉 )

[iron umbra]

Whoaaaa I’ll check those out

[spiral sandal]

when you are done with both, learn async and blink the led while playing pong 😄

[iron umbra]

What should I be doing or watching that’ll make me significantly better at circuitry stuff

Cause my projects due in like a week and I don’t know anything it feels like

[spiral sandal]

i guess stay with some arduino blinking led tutorials on YT

[willow star]

Wait you can make pong with an Arduino? That sounds cool, what kind of additional hardware one would need for that?
I assume a screen + joysticks, is there anything else pong (or other simple games like pong) would need?

[spiral sandal]

no really joystick, only potentiometers on analog inputs

[willow star]

Oooh that makes sense

[spiral sandal]

for screen ssd 1306 should be enough, i2c ones may be slow did not test

[willow star]

Thank you

[spiral sandal]

or buttons https://www.youtube.com/watch?v=YbztpjIDKHE but that would not be original game

[elfin sphinx]

did they not teach you about it ??

but yeah , if you want to start out , get your hands on a basic arduino UNO kit , and just start doing stuff

you will find loads of youtube tutorials , blogs , articles about it

[iron umbra]

it just felt like cognitive overload to me, they showed us an arduino for the first time and then baam now we gotta make a whole smart system after 2 weeks and figure out all the hardware and software for it.

and then we're required to have so many features, to get enough marks

[elfin sphinx]

what is the project ?? and what features are required ??

[iron umbra]

this is the main project

is this supposed to be easy or medium difficulty or smth ?

[elfin sphinx]

i still dont know what the required behaviour is , you just posted the overview

but from what i see , i would say this is beginner to a bit above beginner level

from what i can seee , its just few LEDs , few buttons , and an ultrasonic sensor
i am not sure what those 7 segment displays and LDR / Thermistor are doing there

[opal forge]

Hi im having a problem with runing kivi with good graphics on my raspberry pi 4b, so i connected my raspberry pi to my Acer screen with micro hdmi -> hdmi cabel and when running simple app im getting realy bad graphics on the screen

Also Im runing server version ( meaning no desktop only cmd )

While when running same code on my PC with linux graphic is 10x better

import kivy
kivy.require('2.3.0') # replace with your current kivy version !

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.core.window import Window
from kivy.graphics import Color, Rectangle
from kivy.core.window import Window


class Main(App):
  def build(self):
    window = GridLayout(cols=1)
    # with window.canvas.before:
      # Color(.2,.2,.2,1)
      # self.rect = Rectangle(size=(1200,600), pos=window.pos)

    label = Label(text='Hello World')

    window.add_widget(label)
    return window

if __name__ == "__main__":
#  Window.maximize()
 # Window.fullscreen = True # Making it go to F11 mode
  Main().run()

[elfin sphinx]

can you show some video of what you mean by bad graphics ??

[opal forge]

it's hard to record it from phone

It Looks like resolutions would be different

Like the text gets much bigger than it should ( the cursor as well )

[elfin sphinx]

then yes , firstly set the correct resolution for your display

[opal forge]

That looks like "blured"

[elfin sphinx]

and what does it look like when its "good" ??

[opal forge]

OH okay

Im stupid

Works fine now

[elfin sphinx]

👍

[opal forge]

Thats why i told you it's hard to make it look good from photo

[elfin sphinx]

if the good image is from your laptop , you can just screenshot it right ?

no need to use phone to capture the photo

also you could have just said that "text looks wayy bigger than its supposed to be and blurry "

when you said "graphics" i thought something like , video or pictures or smth

[opal forge]

Now its not from My laptop

It's on the screen of my Monitor which is connected by hdmi to raspberry pi

directly

And the system doesnt no have desktop support

[elfin sphinx]

yep , the bad image is being displayed from the raspberry pi so you have to take photo with phone

but you said if you run the same code using your laptop , the graphics are much better , can you not screenshot those ??

[opal forge]

Oh sorry i can

Okay so the problem was that raspberry was trying to fit On full screen window size of lower size

[elfin sphinx]

i mean if the problem has been solved , its all good , you dont need to send anything

[opal forge]

I just need to make window bigger

[elfin sphinx]

yep , resolutions man , they suck when setting up

[opal forge]

Thats true, but i will be probably working with screens of one resolution so if think i can use static sizes for that

[opal forge]

Do you guys know some GUI frameworks which support packaging for linux? Im planing to create some Kind of self-service checkout and working with docker would be hard also using linux packages may make it easier and more reliable?

[cloud hinge]

Are there rules against mixing others c plus plus code and sharing online?

[supple oxide]

what do you exactly mean with "mixing"?

If you mean modifying and sharing the code, you will have to look at the license. Some licenses require the original author be mentioned, others require you to reuse the license for your new version, etc.

If you want to be sure, just read the "LICENSE" or "LICENSE.md" file in the project root

If the project doesn't have a license you will have to contact the original author and ask for permission.

this site might help: https://choosealicense.com/licenses/

[cloud hinge]

Thank you for the detailed answer.

[oblique creek]

My peepos

Hola

I require assistance with calibrating a light sensor

Please respond

I am dying 😢

[errant wigeon]

What sensor do you have?

[azure sluice]

Any drone guys in here? I’m programming an autonomous boat using adupilot and mavlink. I’m looking for a flight controller that dependable but not overkill for something like a boat that doesn’t experience the kind of stress a air platform would

[floral musk]

guys can you give me idea what i can do with esp32

?

[elfin sphinx]

there are practically infinite ideas , you can find them by googling

some are - weather station , ble remote , ble keyboard , small webserver

[errant wigeon]

Weather stations/air quality stations are a particular favorite project of mine

[cloud hinge]

Sky is the limit, there are a ton of code examples online and in arduino ide . I hope to make a web radio soon. Go on YouTube and search esp32 then refine the results to day, hour, month and year to see what's going on in the world of esp32. Can make watering systems for plants, the sky is the limit of your imagination with reference and skillz. If you have any more questions let me know and ill try point you in the right direction. The l298n is a great motor controller for using pwm to change speed of motor, forward, reverse and stop for two motors individually and its very inexpensive, can use with small motors up to 25w max.

[elfin sphinx]

i particulary like hackaday.io and instructables.com for very innovative project ideas, you can search for esp32 projects on there too

[zealous storm]

anyone able to help i want to setup my raspberry pi 4 with a custom data set on yolov5 and a pico micro controller

[cursive hamlet]

Is anyone familiar with headless pico running, I have a code that works flawlessly when run through thonny but breaks when run headless and I have spent hours trying to figure out how to fix it and I can not do it whatever I try

[elfin sphinx]

have you saved the code actually on the pico itself ??
if yes , what is the name of the file you have saved it in ??

[errant shell]

in what way does it break?

[cursive hamlet]

Thank you both for the replies, the file is saved under the name main.py which does run when powered but unfortunately the code doesn’t work as when launched from the computer. The issue was that when running headless there is no console for the error message to print into. But in redirecting the error message to my LCD screen I get the message “couldn’t determine sd card version”

Which is very strange because it works fine when run via the laptop and I am connecting it to the same power so I am not sure what could be causing the difference

Any help would be greatly appreciated!

[elfin sphinx]

can you show your full code and circuit diagram and photo of your setup ?

[glass locust]

Good evening lads, is there anyone of you who could guide me on robot and sensors training ? I have a college project that requires training a robotic arm to detect and segregate garbage. require some helpful insights on what approach to take !

[errant shell]

Such an error could be timing related. Or that you had dirty state in the microcontroller peripherals left over from a previous run. Before transferring to flash, I would always recommend doing a couple of test cycles where you reset/unplug the USB, then run the code, to check that it works from fresh start

[errant shell]

Also, it could be power-related. When plugged in via USB, that is a power source. If you do not have USB anymore, perhaps something is no longer powered, or is powered in a different way

[oak root]

Good evening, I am just getting started with python and microcontrollers. Any suggestions on where I should begin? I purchased microcontrollers from adafruit and looking like I can work with micropython or circuitpython. I have Sublime Text or vscode. Seem to like sublime text more.

When I have a question I go to the internet and that turns into a rabbit hole that has no end

[elfin sphinx]

you could and should follow the official getting started guide from adafruit for your board

[oak birch]

@iron umbra You can ask here

[iron umbra]

Can anyone join VC and give a lil advice on microcontrollers?

haha thanks mtrr

[elfin sphinx]

amount of people willing to help over VC is thin compared to people willing to help over text

if you describe what you need, people can help in here

[wind stone]

I was soldering and this was making a lot of smoke, my dad said I should have a fan but I forgot, I was blowing it away from me, is this bad?

[spiral sandal]

not just a fan but a smoke extractor so toxic fumes go outside or at least work under opened window , avoid repeated exposure because yes this is bad.

[willow star]

^what pmp-p said, also remember to wash your hands after using it.

[elfin sphinx]

for a makeshift solution , buy charcole sheet , attach it to the back of a 12v PC fan , and then use that to suck those fumes in and keep it near your window , so it sucks the fumes in and then throws out the back out of the window

[hasty pewter]

when lead is melted in open environment does it becomes PBO2
does it try to choke as regular CO2

[quasi hare]

Anyone here who has used this board?
https://www.ti.com/tool/SK-AM62A-LP#description

what sensors can be used on this board?

[cloud hinge]

Good ventilation out the window is a must. Also a good mask helps. A hood with proper exit vent is ideal. The smoke has made my taste buds seem different in the past, either way I'm sure its not good for you, possibly cancerous or lead fumes. Best to stay safe, who know what issues chemicals can cause down the line when it comes to health

[wise hazel]

how do I make input() run in asyncio?

[hallow igloo]

Yo does anyone know where i can find some useful info on autonimous programming using python for something like a rover using a raspberry pi???

[elfin sphinx]

!rules 10

[hasty zealot]

Rules

10. Do not copy and paste answers from ChatGPT or similar AI tools.

[elfin sphinx]

https://docs.micropython.org/en/latest/library/asyncio.html here are the asyncio docs for micropython

[cloud hinge]

@elfin sphinx if i use fabgl code and someone elses code and put them together can i share them on github? i made something really cool i would like to share but im not sure on the licencing. i also used chat gpt to make it

[elfin sphinx]

not sure what fabgl code means
and for someone else's code , check that code's licence and follow it
if they dont have one , shoot them mail or smth

[spiral sandal]

actually i think you should share code, since fabgl is GPL https://github.com/fdivitto/fabgl?tab=License-1-ov-file#readme

[cloud hinge]

i dont see a license on the other persons code in git, does that meen its ok to do whatever?

[spiral sandal]

if it was the link you removed there's an open issue about licensing

[cloud hinge]

yeah, so i cant use it?

[spiral sandal]

you probably can as long as everything derived from that work is labeled GPL v3 too

[cloud hinge]

i would not have a clue...

[spiral sandal]

ask a lawyer then

[cloud hinge]

is there a way to find out besides git?

[cloud hinge]

im too poor for all that and not trying to profit just wanted to share if its ok. if not i guess it stays in a lock box lol

[spiral sandal]

open an issue on github asking kindly for permission and what you want to do with it and keep track of the answer

[hallow igloo]

open an issue on github asking kindly for permission and what you want to do
with it and keep track of the answer

[cloud hinge]

awesome guys, ill look into that, thank you

i think it might be beneficial for some in the community hopefully

[spiral sandal]

look in asyncio console code

if on posix then put stdin in non blocking mode and use select() on it

[wise hazel]

its this code thats giving me problems:

await asyncio.to_thread(input, prompt)

it gives me this error:

AttributeError: to_thread

on CircuitPython

[sacred pecan]

CircuitPython doesn't have threads

[sacred pecan]

What are you actually trying to achieve as with CircuitPython there's not usually a shell to read input from

[wise hazel]

ok

[dim vapor]

what is the difrence between micropython and circuitpython?

[sudden iron]

Hi all. I have a switch box, running on arduino. Everytime i turn one of the switchs for example , it prints "strobe.switch.on" on the serial monitor. I would like to write something in python that gets that printed value and transform everytime it prints something like that, to press the "s" keystroke for example.

So something like
Pyinput
Input keyboard

[errant wigeon]

For "Big Enough" chips, MicroPython is a lean and efficient implementation of the Python 3 programming language that includes a small subset of the Python standard library and is optimised to run on microcontrollers and in constrained environments. CircuitPython is a fork from MicroPython which has some minor changes to MicroPython in an effort to simplify experimenting and learning to code on low-cost microcontroller boards.
The boards they support can be found here:
https://micropython.org/download/
https://circuitpython.org/downloads

Micropython tends to make use of as much as it can on each chip it's on, and that means the api from one chipset to another might have a fairly large difference. Circuitpython in contrast attempts to maintain the experience from one chip to another so it's more familiar, but that comes at the cost of some features not being as optimized as in Micropython

[elfin sphinx]

so if i understand this correctly, you have an arduino , that says some stuff using Serial.print() , and you somehow want the python program to read that and do some actions , correct ?

[cloud hinge]

As much as i respect peoples license to code it looks like it could be holding back major innovation if everyone who wants to post new code based on old code has legal roadblocks. I see both sides but its interesting. Like what if you want to ask permission to use someone's code and it takes years for them to get back? Society keeps moving along but the codes that have been created might never be released. Am I correct in this assumption?

[elfin sphinx]

i would just post the code and in the readme say that - this XYZ part of this system uses code of ABC person's project over at <insert their link>

it might violate the licence, not really sure , but yea , i would just do it

[cloud hinge]

Would that protect me legally? I can't afford and financial issues in the future

Thank you for the insight

i texted the authors with the github issues feature on github but it looks like the project hasnt been worked on since 2022

[willow star]

It wouldn't protect you legally, and if this is something serious, you should consult a lawyer

[elfin sphinx]

not really sure , it might not

but i like to live life on the edge

if their code is open source and they dont care to put a licence on it neither do they reply to messages , i doubt they care to take stuff to legal action

[cloud hinge]

@willow star thank you, makes sense

[cloud hinge]

ok, il do my due diligents first and then think about that, i doubt it either, i think i seen something mention about someone elses license so maybe they were using others license to begin with lol.

[wispy lintel]

Is vdhl part of micro rollers and is it hard to program the corrections functions to micro trollers with vhdl

[errant wigeon]

Do you mean VHDL?

If so, VHDL is a hardware description language for things like FPGAs, which are chips that let you actually change how the chip works on the inside. A micro controller is much more set in stone as to what it can do.

VHDL is.. not terrible? But I didn't have fun learning it and didn't retain any of it. It's really powerful if that's the level of programming you need, but it also consumes a ton of power and for a lot of things you don't need it.

almost all of my personal needs for microcontrollers are hobby projects like weather stations and smart home controllers.
FPGAs are great for really high speed processing, but for a lot of things I need there's something cheaper and simpler. And since it's a hobby project, simple is nice

[wispy lintel]

Yes I did meant that

Sorry

[errant wigeon]

No worries, I assumed that's what it was after I couldn't find anything related to vdhl
but yeah, you can do a lot with an fpga and VHDL, that said it can be overwhelming very quickly

[wispy lintel]

How is that so?

I am looking at doing a capstone and am thinking of doing a flashing light microcontroller.

[errant wigeon]

The way you write vhdl is to describe the circuit itself, rather than just the code like you would with a python program. With that comes the fact that the circuit does a lot of things at once, so where lots of python code is single threaded, hardware does a ton of things at the same time. So the way a program works on an fpga is different, and that can be a difficult thing to mentally understand.
Also the language itself is rigid and feels different than python. (But like in the 'fortran feels rigid and can do a lot of amazing things' kind of way)
If you're thinking of that for the capstone, I'd encourage you go for a micro controller before you do anything with vhdl

[wispy lintel]

I am thinking of implementing VHDL with using a microntorller

[errant wigeon]

I don't know if that's possible, could you describe it in more detail?

[wispy lintel]

https://nandland.com/your-first-vhdl-program-an-led-blinker/

https://stackoverflow.com/questions/209603/steps-to-make-a-led-blink-from-a-c-c-program

Never mind as it does look like to be uisng C++ for that reason

[errant wigeon]

ah, ok so you want to write vhdl to blink an led, not put the vhdl on a micro controller. I think I follow that a lot more now

[wispy lintel]

Yes as that is correct.

I see that VHDL is mostly used for hardware testing but are there like components that can be associated to vhdl

[errant wigeon]

Why are you interested in VHDL vs something else?

[wispy lintel]

I need to learn it for embedded system course and so I am interested in using microcontrollers as that is part of the course

The book for the class ask to learn VHDL

College course as am going for CS

[errant wigeon]

Ok. I think that makes sense.
Really quickly, VHDL code is usually deployed to an FPGA, but you can simulate the circuit on the computer. So you can write VHDL to blink an LED, but to put it on something else you'll need an fpga.
FPGA's are different than micro controllers. They are confusingly similar, but they are different.
https://www.reddit.com/r/ElectricalEngineering/comments/120pgl8/what_is_the_practical_difference_between/
https://rushpcb.com/fpga-vs-microcontroller-understanding-the-key-differences/
These two links help describe their similarities and differences

[wispy lintel]

Thank you for that

[errant wigeon]

(Fixed the reddit link, I copied the wrong one)

[wispy lintel]

Any advice to survive the mebedded systems course.

[errant wigeon]

Take it step by step, and ask questions when you don't understand what's going on.
Embedded courses have changed a lot since I took them, but at their core it still covers the basics. Micro controllers are simple machines, that's why you can talk about how they're built at their most basic level. That said, it's easy to get overwhelmed. Focus on 'what actually needs to happen' one step at a time.
It's similar to programming, break everything down to really simple steps. Read datasheets, write notes as you read it, etc.

[wispy lintel]

This is a eight week course as well and so I’m trying to break a step-by-step so then I can accomplish it within that specific time we are expected to do between 16 to 20 hours per week and so it will be a part-time job for me

To survive this course at this is really important for me to graduate as so that I can be able to complete my CS degree. Thank you very much again for your help and all.

[wispy lintel]

@errant wigeon

[elfin sphinx]

VHDL is used to describe hardware , it is not a programming language that tells microcontrollers what to do

[wispy lintel]

Thank you

[cerulean timber]

I’m having issues trying to get this ultrasonic sensor work, is there anything wrong with the wiring?

[floral spruce]

I can't really see any of that wiring, so not sure 👀

[cerulean timber]

lemme take some better pics

[floral spruce]

I mean first thing that looks like it could be off, the little black breakout that's providing power from USB, how is that currently connected to whatever the blue board is?

Because it doesn't look like they share ground

[cerulean timber]

this is essentially what ive done, sorry just redid on tinkercad

im pretty sure its the faulty black wire on the gnd pin of my ultrasonic, its really loose but the school hasnt provided enough FF wires sadly

[floral spruce]

Maybe, but first I'd check this

Because I can't see in that original photo where the black board and the blue one are sharing a ground

You have the gnd of the sensor going to the blue board, but there's no gnd going to the black board that I can see

[cerulean timber]

This part??

[floral spruce]

Ah okay so is that grey wire the one connected the gnd of the black board to the blue board?

[cerulean timber]

Yeah the grey goes to the black board and the blue goes to the ultrasonic

[floral spruce]

Okay so that probably isn't the issue, what's going wrong at the moment?

Are you just getting bad readings?

[cerulean timber]

its not reading anything other than 0

could just be chatgpts horrid code though

[floral spruce]

did you write the...

Ah

[cerulean timber]

yeah

😭

[floral spruce]

Then yeah, maybe share that

[cerulean timber]

yeah im not sure what this is actually doing, i was just trying to test the ultrasonic sensor

i have 4 on me, none of them are working with the code, so im assuming its a code issue

[floral spruce]

This seems rather odd, why do you have a 10 second delay after setting the trigger pin high? Correct me if I'm wrong, but the way an ultrasonic sensor works is you set the trigger pin high, and then you wait for the echo pin to go high, and you can figure out the distance based on that.

At the moment you set pin1 high, then sleep for 10 seconds, which is a longgggggg time, it'll take that sensor a fraction of a second to read the distance and set the echo pin high, so you're never going to see it in this configuration.

[cerulean timber]

yeah that might be the issue

[floral spruce]

You can probably just remove those two lines after pin1.write_digital(1)

Just set it high and then call your measure_pulse

Let me fact check that though

It may be a bit different to what I'm thinking

Ah okay so maybe you do need a falling edge for it to then send out the pulse, but seems like the trigger pin should only go high for a couple microseconds

Is that sleep currently in seconds or ms?

[cerulean timber]

theyre ms

[floral spruce]

Then you'd want to change it to sleep(0.01)

To get 10 microseconds

[cerulean timber]

im not sure what its doing, its still reading 0

[floral spruce]

Send the code you've got at the moment, we'll take a look at that

[floral spruce]

Go back to this, try with the sleep(0.01)

As in after setting it high

So ```py
pin1.write_digital(0) # you probably don't need this
sleep(1) # or this
pin1.write_digital(1)
sleep(0.01)
pin1.write_digital(0)

Set it high, wait 10 microseconds, then set it low

[cerulean timber]

oh alright

its still only reading 0...

theres no interference or whatever, ive tried sitting it down and holding it up so unsure

[floral spruce]

Send the code you've got at the moment

wait

I think your trigger and echo pins are switched, it might be the angle of the photo

But it looks like you had trigger connected to pin 2 on your microbit

And echo to pin 1

[cerulean timber]

i think youre right

... its still reading 0

[floral spruce]

Send a photo of what your circuit looks like now

[cerulean timber]

one issue ive been having is that the black FF wire on the ultrasonic keeps falling out, but i dont own another wire. every test ive done it stays in though

maybe ill tape all 4 of the wires on the ultrasonic together, and then tape the gnd wires together

[floral spruce]

Send the current code you've got, we'll do a check on that again

[cerulean timber]

weird quirk ive found with it, if i put anything super close to the sensor, it reads 3

[floral spruce]

Is dividing by 58 correct? we may as well check that real quick
Speed of sound is like what, 340 m/s, that's 0.34 m/ms, which is 34cm every millisecond. So shouldn't you be multiplying your duration by 34, since your duration is the time in ms that the pulse took? Or actually divide it by 2 to find the real time it took to go one way rather than both, then multiply by 34?

[cerulean timber]

btw this is my actual assignment's code, that code is just to try and get any reading on the ultrasonic

this one just displays a sad face, which is def an issue with the sensor

[cerulean timber]

i feel like thats probably right, gpt's logic didnt even sound remotely right

[cerulean timber]

this is like the 37th iteration or something, im sure this has its own issues but thats not too important right now

[cerulean timber]

now im getting numbers, its just like 500 and 600 and stuff

[floral spruce]

sounds a bit better

[cerulean timber]

yeah its reading numbers, the multiplication value just seems off

ive tried a couple, but i think it reads 0, 1 and 2 multiplied by whatever it sees closest. i was holding my phone 30ish cm away and it was reading 2

[floral spruce]

I mean it won't be particularly accurate, and also you're reading this off the microbit display right? That's probably going to be rather tricky

Maybe print the values out if you aren't already

And check the output

[cerulean timber]

yeah my teacher made this assignment really dumb

[floral spruce]

Because reading them flashing around on the display isn't going to be easy

[cerulean timber]

im not even sure how to print to the serial monitor on mu

[floral spruce]

I'm sure it'd be possible, I wouldn't know how I've never used a microbit before

But sounds like a pretty standard feature it'd have

[cerulean timber]

i think it works better on makecode

except for some reason it has 40 problems on there

sleep isnt defined on there wtf

might just stick to mu

[hot scaffold]

I just dug out this pad that my programmer friend gave me a while ago, thinking nothing of it...and I'm completely blown away.

Apparently, once I learn something called CircuitPython, I can make this do whatever I want! 😄 It's exactly what I've been looking for!

[livid locust]

finally built a shadowboard builder with a raspberry pi!

[vocal fable]

Wait a rasberry pi is a microcontroller?

Its literally a mini computer

[livid locust]

my bad i guess i didnt fully understand what a microcontroller was

although, wouldn't this still be the best channel for that message?

just messaged the mods and it does fall within the scope

[cosmic kindle]

Do you guys have any idea about rospy

[spiral sandal]

i would closely watch ROS2 + its wasm ports ( backed by quantstack) and look for python 3.13+ wasi integration

[cosmic kindle]

I have to use ros2 and gazebo

In order to that i need to learn Rospy library

[spiral sandal]

i think you may need something like https://github.com/dheera/rospy2 too then for code porting

[limber stratus]

I always wondered if I wanted to actually build my prototype, how would you do this? Has any sent their project to a company thats able to make something ie custom circuit boards, cases etc.. for whatever project

[spiral sandal]

for samples you can order online and get your board(s) in the mail

be warned if you do assembly outside your country you will have to deal with inspection/certification from FCC/CE customs etc ... especially if involving wifi

[limber stratus]

Samples? What do you mean? So I have an arduino and been messing around, but its a bit bulky (especially with the bread board) but lets say I wanted to build a drone or idk a remote control car or something. After the prototype is made, are there companies that people have dealt with that build peoples ideas if you send them protoypes?

Also, unrelated question, is this channel mostly for Python microcontrollers or ones that can potentially run Python or microcontrollers in general

[spiral sandal]

you send them drawings for circuit board

then they make the board for a quantity and send them back to you

[limber stratus]

I see so then you would send your "shell" of whatever external supporting case to another comanpy that does like plastic moulding or something?

[spiral sandal]

if you are dealing with GPIO and SPI/I2C then you are on topic

[spiral sandal]

yes you need multiple providers because different jobs, if you want simple you go to specialized firm that do everything and they will charge you A LOT for prototyping

that's why everybody use carboard and hot glue to design the future

[limber stratus]

Good to know. I had some random ideas, I'd like to create . I was thinking I might try and get a 3d printer to create my own cases to start then go from there lol

What are the downside to ESP32? I like my arduino, but ESPs are so cheap.

[spiral sandal]

if using with python, memory too small pick esp32 with PSRAM

if you know what you are doing esp8266 is just enough for everything ( though only 1 adc is really short )

[cosmic kindle]

i am make a robot arm can use in insdustury the job of robbot is pick up the pakage from conver belt and place into somewhere else

what that purpose i need to learn ros 2

gazebo

and tf.broadcast

i new in robotics i don't have any knowlege

and zero work experience

in ros

[spiral sandal]

robot arms are really quite complex,expensive and breakable stuff when used in real situations

[cosmic kindle]

i am participating in national competion

[spiral sandal]

with real arm or simulator ?

[cosmic kindle]

yes

and i have to do all coding realated stufff

[spiral sandal]

if real you need to build a model of it

[cosmic kindle]

including ros and open cv

[cosmic kindle]

i the arm will be given in competion all i have to do is coding stuff

[wispy lintel]

Does c or c++ works best for microcontrollers.

[elfin sphinx]

most SDKs for common microcontrollers are written in C++....

[hallow igloo]

Where can i start learning how to program an arduino to handle a a mini rover

[wind stone]

most arduino coding is done in c++

[wind stone]

start with the most basic tutorial you can find then dive into controlling servo motors and navigation

[hallow igloo]

Just a basic intro to arduino pretty much and go from there?

[wind stone]

yeah thats what I would recommend

How do you guys make your pcbs? I have a more complicated project (macro pad) the wiring is not particularly complicated just a lot of wires, thinking about going chemical etching.

[spiral sandal]

for simple stuff i use that type a lot https://www.aliexpress.com/item/1005001856688942.html

[wispy lintel]

Thank you

[hallow igloo]

HOLY

[onyx shadow]

I don't have much experience but I wouldn't say there are downsides? esp32 should be more powerful and seems to have more features

[limber stratus]

Yeah they seem pretty good so I’m like why so cheap. I wonder if the cost for the Arduino goes into the “support” like it’s IDE and whatnot.

[onyx shadow]

use rust 🤓

[elfin sphinx]

The only "downside" to an esp32 when compared with Arduino would probably be the power consumption. Other than that , esp32 are pretty much better than Arduino in all aspects. They are cheap because chinese manufacturer mass produce clones which drives the price low

[elfin sphinx]

Fwiw Arduino are pretty cheap too, if we talk about clones

[astral jacinth]

I'm happy with EPS32 and ESP8266. I'd recommend it for MicroPython development

Plus you get a WiFi included

[cloud hinge]

I was able to make a esp32 cyd positive affirmations sender receiver if anyone wants to try out the code

[limber field]

WIFI on a ESP32 has many uses

[cloud hinge]

loving these cheap yellow displays, for just a bit more than a esp32 can have a touch screen built in. anyone else tryed them out?

[elfin sphinx]

maybe show a picture / link to what displays you are talking about ??

when i search for cheap yellow touchscreen display , all i see is these mobile phone displays

[cloud hinge]

@elfin sphinx

cyd or cheap yellow display. the 2.8 inch one seems to be the sweet spot in price and value. just a standard esp32 i think with many awesome features. lots of youtube videos on it. they also have a discord channel for it.

[elfin sphinx]

from what i can see they are just like any other display just with a different PCB colour

but yea i used similar displays with same display driver ICs , work fine

also the 2.4 inch displays (the non yellow ones) are like 10 bucks , so they are cheaper ig

[cloud hinge]

nice, yeah, it has ldr and speaker hook up. i would like to get a screen without esp32 but im enjoying this one for now

[cloud hinge]

the esp32 in the screen makes it come out to about the same price

[elfin sphinx]

i guess , yeah

but i rarely encounter a project where all i need is just the ESP32 and a big display
having the ESP32 seperate makes it easy to hook up components and everything

[cloud hinge]

theres this library for it and maybe your projects too. some good examples and theres another repo somewhere to with other good examples. https://github.com/witnessmenow/ESP32-Cheap-Yellow-Display

[elfin sphinx]

these displays might be good for stuff like differet dashboards , status indicators etc

compact in size , have everything integrated in single PCB , cool concept 👍

[cloud hinge]

i got two for espnow experiments. i created a 12 button touch screen with macro keys and gave it bt functionality today. i see potential, coming up with fun ideas is the hard part sometimes

[elfin sphinx]

thats a cool project

[cloud hinge]

have you ran espnow @elfin sphinx ?

[elfin sphinx]

i had experimented with it , but not used in any projects yet

[cloud hinge]

chat gpt has been helping

[elfin sphinx]

nicee

[cloud hinge]

nice, its very fast and longer range

[elfin sphinx]

yep, just dont have any project idea for it yet

maybe a RC car 🤷‍♂️ not really sure

[cloud hinge]

Today's fun

I think I'll make two pages for it for more buttons and a front menu if I can pull it off. Need it for my plant watering system

[elfin sphinx]

pretty sure if i do start on that idea its gonna end up in the graveyard of unfinished projects 😂

[elfin sphinx]

In theory you could make it as many layers deep as you want
good luck !

[cloud hinge]

Lol, what ya working on lately?

[cloud hinge]

4mb of pure goodness

[elfin sphinx]

Developing a system for a client
they want to make a ESP32 based periodic timer system (something you would use for like a stuff reminder box or smth like that )
and i have to make it low power so it consumes very low power when connected to battery , so just working on that
and apart from that , just fucking around with the 3d printer i recently got

[cloud hinge]

@elfin sphinx I made a esp now positive affirmations sender receiver also with serial interject to send whatever while it sends 40 random positive affirmations can overdue with other text

[elfin sphinx]

ohhh noicee

so its like one of the 40 hardcoded affirmation being sent out or if user types something , that gets sent , correct ?

[cloud hinge]

Awesome man. I hope to find d some work like that one day

[elfin sphinx]

you wil you will , dw

i got that client bcoz one of my college friends hooked me up lol

[cloud hinge]

Low power is king with mcu, what 3d printer did u end up going with?

[elfin sphinx]

(aight i have to dip now , ill be back after a while)

[elfin sphinx]

SV06

[cloud hinge]

nice, ok man, cheers!

[cloud hinge]

https://github.com/codemaster010/ESP32-BLE-Keyboard-PS2-/blob/PS2-FabGL-BLE-Keyboard/README.md

what do you guys think about this project? uses the ps/2 port of regular keyboard with esp32

[onyx shadow]

Hey, I don't have any experince with ESP32 or embedded stuff in general and I'm trying to configure an I2C comms with an external sensor, what may be going wrong there?

#[entry]
fn main() -> ! {
    esp_println::logger::init_logger_from_env();
    let peripherals = Peripherals::take();
    let system = SystemControl::new(peripherals.SYSTEM);
    let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);
    let clocks = ClockControl::max(system.clock_control).freeze();
    let delay = Delay::new(&clocks);

    let sda = io.pins.gpio8;
    let scl = io.pins.gpio9;
    let mut i2c = I2C::new(
        peripherals.I2C0,
        sda,
        scl,
        100u32.kHz(),
        &clocks,
    );
    for address in 1..255 {
        let mut data = [0u8; 6];
        delay.delay(20.millis());
        let result = i2c.write_read(address, &[0xFD], &mut data);
        match result {
            Ok(_) => log::info!("Device Found at Address {}", address as u8),
            Err(_) => log::info!("No Device Found"),
        }
    }
    loop {}
}

I can't seem to read/write from any address and I'm not sure if it's a code or physical problem 😅

[elfin sphinx]

which ESP board do you have ?? which sensor are you using ?? (also it might be great if we could see a connection diagram or a photo of what you have wired up )

[cloud hinge]

Perhaps try to add some type of debug system to help point of its either or. Were you able to make progress by chance?

[leaden heron]

uh can you code an Arduino in python

[onyx shadow]

@cloud hinge @elfin sphinx I'm using an ESP32-S3 board and a SHT40/41 sensor: https://sensirion.com/media/documents/33FD6951/662A593A/HT_DS_Datasheet_SHT4x.pdf
0xFD command should measure temperature and humidity, response size is 6 bytes, so I create a buffer for that: [0u8; 6];
SDA is pin8, SCL is pin9 🤔

[frigid frigate]

Guys, I have to build an ai powered image recognition system for my science competiton.I have made the program but i don't know how to use any microprocessor or build a model. Can anyone please help me

to display it in and ofc i can't just take my laptop their and show them

[elfin sphinx]

this pin should go to GND instead of 5in right ?

[onyx shadow]

It's ground

[elfin sphinx]

yea, then why is it connected to the 5V pin ?

[onyx shadow]

It's connected to ground, perspective issues

[elfin sphinx]

ahh ok

and whats the value on those pull up resistors ?

[onyx shadow]

I've been at this problem for a couple of days and can't figure out what's wrong 😅

they're 2kOhms, should I try a different value?

[elfin sphinx]

it should be fine , but just for peace of mind , try something like 2.5k-3k ish

the "recommended" for 3.3V logic is 2.4k afaik

[onyx shadow]

Ok, but is there anything else that could be wrong there?

[elfin sphinx]

make sure you are using the correct address for your module

you can find out the address of connected device using a i2c scanner code example

[onyx shadow]

I only have 2k, 2.2k and 3.3k 🤔

[onyx shadow]

My code is an i2c scanner 😅

I bought a multimeter and measured 100khz on the bus, so I assume it should be working?

[elfin sphinx]

do 2.2k

also , try it without those pull ups as well

pull ups are not always externally required , i have never used pull ups on almost 95% of the I2C modules i have used

[onyx shadow]

I think I tried without pull ups, but I'll try again

Really no change with 2.2k resistors and without them 🤔

[elfin sphinx]

aight , so hardware wise , all seems to be connected just fine

but unfortunately i have no idea how rust works so i am unable to debug your code

how about , you try this arduino code

#include <Wire.h>

// Set I2C bus to use: Wire, Wire1, etc.
#define WIRE Wire

void setup() {
  WIRE.begin();

  Serial.begin(9600);
  while (!Serial)
     delay(10);
  Serial.println("\nI2C Scanner");
}


void loop() {
  byte error, address;
  int nDevices;

  Serial.println("Scanning...");

  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    WIRE.beginTransmission(address);
    error = WIRE.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4)
    {
      Serial.print("Unknown error at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");

  delay(5000);           // wait 5 seconds for next scan
}

and share the output , so we can see if its a hardware issue or software issue

[onyx shadow]

Thanks, i'll try that 🤔

[elfin sphinx]

(post what happens when you can, ill be back in few , have to step away)

[onyx shadow]

I think it's waiting for serial forever for some reason

And the code works in wokwi simulator 🙂 https://wokwi.com/projects/409710252052961281

I tried different sensors and different esp32 s3 boards, but result is the same

[elfin sphinx]

thats not the serial monitor . That just shows the output of upload process

you have to open serial monitor seperately in the arduino IDE using this button

so , open the serial monitor and press reset on your board

[onyx shadow]

Uh, encoding problems?

10:17:23.883 -> @⸮⸮)⸮΀2⸮⸮⸮9m⸮M)n⸮

[elfin sphinx]

probably

check that the baud rate of serial monitor is set to 9600

[onyx shadow]

In the code? It is 🤔

And in monitor itself too

[elfin sphinx]

just for my confirmation , could you send a pic of your whole serial monitor ?? 😅

[onyx shadow]

rate of 115200 seems to work? 🤔

But it doesn't seem to scan anything, I'm also very confused why rust code seems to work in wokwi

[elfin sphinx]

yea , so the 115200 buad should be changed to 9600

[elfin sphinx]

this is what you see when you reset the board right ?

[onyx shadow]

Yep

[elfin sphinx]

can you set it to 115200 in both places and check again ??

(you need to recompile and reupload the sketch after you make a change )

this is pretty weird issue, i never had problems with this baud rate

[onyx shadow]

^ That's what I was getting

[elfin sphinx]

HUH

why wont it print anything then , at least this line Serial.println("\nI2C Scanner"); should have been printed

[onyx shadow]

I tried a different board, it's the same 😅

[elfin sphinx]

different ESP32 S3 board or different model board ?

[onyx shadow]

Different esp32 s3

Ugh, I've been using a wrong usb type c port? 😅

What are default pins for i2c on esp32s3?

[elfin sphinx]

if you see the boot messages in serial monitor , then it means that the serial connection is working

[elfin sphinx]

from what i could find (i swear why is there not a single diagram that explains the pin functions in detail lol) , looks like 8 and 9 are the correct ones

[onyx shadow]

It doesn't seem to be able to find anything 🤔

[elfin sphinx]

void setup(){
  Serial.begin(115200);
  while(!Serial)
    delay(10);
  Serial.println("The serial monitor is working");
}

void loop(){
}

[onyx shadow]

No, the serial is working now, but It doesn't seem to be able to find any i2c devices

[elfin sphinx]

What does the message say ? ?

if it cant find anything , it should print i cant find anything to monitor

you see that ?

[onyx shadow]

10:34:50.123 -> Scanning...
10:34:50.123 -> No I2C devices found

[elfin sphinx]

ahhhhhhh, good

so at least something is working

ok, do you have any other I2C module ? ?

like a dispaly module or whatever
anything that uses I2C

[onyx shadow]

Yeah, I have the same sensor and a couple of screens, but I tried them before too with the rust code

[elfin sphinx]

can you connect one of them which you know works to this setup and see if their address is getting recognized ??

bcoz tbh i really dont see why it shouldnt work , you are doing everything just fine

so we want to eliminate the possibility of the faulty module

http://wiki.fluidnc.com/en/hardware/ESP32-S3_Pin_Reference

looks like you are using the correct default pins

[onyx shadow]

I tried a different one (same model) and the ldc screens, but nothing seems to be working 🤔

There's physical connection between all the relevant pins

[elfin sphinx]

#define WIRE Wire1
can you change the second line of code to this and try again ??

maybe , the Wire is not the correct interface we want (which it should be , but we try everything we can)

[onyx shadow]

10:45:06.697 -> Unknown error at address ...
10:45:06.697 -> Unknown error at address 0x7E
10:45:06.697 -> No I2C devices found

[elfin sphinx]

Aight , so something

can you try different mix and match of pull up resistors , try upto 10k ?

[onyx shadow]

This was without resistors since you mentioned that you didn't have to use them in majority of cases 🤔

I'll try

[elfin sphinx]

yea, but i mostly use the ESP32 wroom module , rarely used the S3 , so maybe its different on there 😅

[onyx shadow]

It seems to be able to find the lcd screen with both I2C0 and I2C1...

[elfin sphinx]

you mean like with Wire as well as Wire1 ?

[onyx shadow]

Yeah, I'm trying it with the rust code too

[elfin sphinx]

not just yet , now we know that I2C bus is workign

now connect your actual sensor to the ESP32 , and see if that gets recognized

[onyx shadow]

Yeah, It doesn't seem to be able to recognize the sensor 🤔

[elfin sphinx]

like , not even the Unknown error at address ... thing ??

[onyx shadow]

1 sec

[elfin sphinx]

bcoz if you see the unknown error thing , you might be able to try different pull ups and maybe get it to work

but if you see no device found at all , then it might just be a busted sensor

[onyx shadow]

It says "uknown error" for majority of addresses, I'll try different pull up values

Is there some sort of documentation on how to calculate the needed resistance?

[elfin sphinx]

what do you mean "for majority of addresses" ?? you have multiple devices connected on the bus ??

[onyx shadow]

For all of them* 😅

[elfin sphinx]

yes , but its kinda complicated , you h ave to factor in the capcitance and whatnot (https://www.ti.com/lit/an/slva689/slva689.pdf)
in 99% of the cases , a ball park value should be fine .

[elfin sphinx]

HUH 😂

Tbh if the screens are getting recognized , i blame this on a faulty sensor module

bcoz whenever we see the Wire.endtransmission return code 4 , it means the I2C bus is kind of mess and something is wrong in hardware ( its documented as "other error" )

[elfin sphinx]

also if the chip was powered like this even accidently , it has the potential to permenantly damage the chip

[onyx shadow]

I think it's a problem with this specific sensor model

I've seriously been considering becoming a gardener at this point 😭

[elfin sphinx]

do you have another module of this sensor ?? you can try that as well

[onyx shadow]

It works even without pull-up resistors

[elfin sphinx]

as it should in most cases , yea

[onyx shadow]

I have two, they both don't seem to work

Different one does...

[elfin sphinx]

where did you get the sensor from ?

[onyx shadow]

They're from aliexpress, different ones seem to work though https://aliexpress.com/item/1005005517463180.html

e.g. this one https://aliexpress.com/item/1005002652456277.html

[elfin sphinx]

yea but those modules use different chips, so..

tbh i am not really sure why this is causing problems, i dont see anything wrong in your setup or the code , also the other I2C devices get recognized just fine so.....

whenever i am in situation like this , i just grab an arduino Uno or Nano , connect my sensor to that and see if that works

i suggest you do the same (just make sure you provide the sensor with 3.3V power instead of 5V also make sure you use a logic level converter module between the arduino and module because the arduino works on 5V logic levels )

a module like this should be fine for the logic conversion (they are dirt cheap too)

[onyx shadow]

I'd rather just use a different sensor and get my $2 back for these ones 😅

Thanks a lot for the help, I've been at this issue for a couple of days

[elfin sphinx]

if you dont have any of the stuff i mentioned like the arduino or this module on hand , then yea , thats the most logical option
but if you do have these things on hand , it wont hurt to give it a go in my opinion

either ways, good luck and have a good one

[onyx shadow]

Thanks a lot again, I was able to read the data from sensor 😃

pub async fn read(&mut self) -> Result<Aht30Result, Error> {
    self.i2c.write(self.address, &READ_SEQ)?;
    Timer::after_millis(100).await;
    let mut buffer = [0u8; 7];
    self.i2c.read(self.address, &mut buffer)?;
    let temp_raw = u32::from_be_bytes([0, buffer[3] & 0b00001111, buffer[4], buffer[5]]);
    log::debug!("Aht30 raw temperature {:#x}", temp_raw);
    let temp = f64::from(temp_raw) / f64::from(i32::pow(2, 20)) * 200f64 - 50f64;
    log::debug!("Aht30 temperature {}", temp);
    Ok(Aht30Result { temp })
}

INFO - Aht30Result { temp: 26.611900329589844 }
INFO - Aht30Result { temp: 26.60999298095703 }
INFO - Aht30Result { temp: 26.601409912109375 }
INFO - Aht30Result { temp: 26.615524291992188 }
INFO - Aht30Result { temp: 26.598358154296875 }

[elfin sphinx]

HUH

what was the issue ?

wait , this is another sensor right ? it says Aht30

[onyx shadow]

I guess the sensor itself

[elfin sphinx]

ahhh okok

[onyx shadow]

Yeah, this is a different model

[elfin sphinx]

well, congrats !!

what are you gonna make ?? weather station ?

[onyx shadow]

Yeah, something similar, seems like a nice opportunity to work with rust and try to send that data to prometheus server

[tranquil robin]

Hey, if I want to program a remote control (in TV remote control style) for my pc with bluetooth, do I program my microcontroller as a wireless "keyboard" or, with a blutetooth master-slave system, let the slave simulates key presses?

[elfin sphinx]

programming smth like ESP32 to act as BLE keyboard should do just fine

your PC thinks its just another keyboard

[vague knoll]

you want to run a .bin file on a micro controller ?

[elfin sphinx]

a .bin file compiled for a target uses the instruction set for that target
for example a file compiled for Arm processor uses the arm's instruction set ( and it wont necessarily work on another machine that uses different kind of processor with different instruction set)
so you need to know what kind of chip your smartwatch has, then emulate that somehow on your PC ,if you are able to do that , you can run your code on your PC

or maybe the smart watch you have is a very popular smart watch , people have already RE it and have made tools available , so gotta do some googling depending on your exact watch

this indicates that the data inside your game.bin file is of binary type

yes

file command is used to find out the type of file and data

yes, thats another type

if you do a text file , ti might show smth like ASCII text

you need to know the instruction set for your chip , then emulate that using some sort of program , like python or whatever
then you would need to make another software that emulates the screen and buttons of your smartwatch using a GUI library in python or whichever language

all of this is insanely hard and really not worth it for running a simple smartwatch game

why do you want to run it on PC anyway ?

what OS does the watch run ?

is it like android based or no ?

do you have a link to that watch or smth ?

hmm , sounds like another chinese clone smartwatch

if you are able to get what microprocessor is used inside the watch , and if its a common microcontroller like STM32 based or smth then you can do some progress

but i doubt its that , its most likely custom chip with its numbering sanded off , so you are most likely gonna get nowhere with this 😂

at any rate , the RE server might be able to give you some insights on the .bin file of yours ig

those people know how to exploit stuff and they might be able to give you extra insights

whats the chip number ?

like apple A7 chip ??? sounds unlikely , that chip is overkill for a smartwatch and probably a lot expensive
not to mention apple doesnt really release stuff like that to others afaik

well , good luck with your journey lol

[faint lichen]

hello i got pico mw and i been trying figure out how to get adafruit momo 0.96 oled working?

it keep telling me no module

[eager dagger]

did u pip install the module?

[faint lichen]

im on thonny right now trying make it work

[eager dagger]

what library is it that ur trying to use?

if u dont install the library with pip, it needs to be in your interpreter's site-packages directory

or the same directory where your shell is running. the error message says python cant find that module, meaning its not installed properly or in the wrong directory

[faint lichen]

that what i been trying to do but it keep giving me error

[eager dagger]

ok, what is the name of the module

[faint lichen]

ssd1306

[eager dagger]

ok did you do:
pip3 install adafruit-circuitpython-ssd1306

in terminal?

[faint lichen]

im on window 11 it not linux related

[eager dagger]

ok but the rpi is

on the rpi itself - you need to run that command

you can run that command on windows as well

[elfin sphinx]

do you have a circuit diagram and a photo of how everything is connected together ?

and send error message

[faint lichen]

it pico microcontroller i'm trying to make rc car

[elfin sphinx]

okay , but we still need to see a connection diagram , the code , the error message

also a photo of full thonny editor when it gives error would be great

[eager dagger]

i suspect it's not installed

[elfin sphinx]

usually i drag drop stuff onto the pico, dont know if pip install even works on that thing

[eager dagger]

im not super familiar with the pico - is it micropython or cpython?

[elfin sphinx]

both are different things

micropython and circuitpython , both are supported on pico

also since its micropython/circuitpython , its kind of board independent (the pip stuff)

[eager dagger]

thats pretty cool. i am building a gui library for micropython on the CYD. assumed it was pretty similar

[faint lichen]

it python

it qt cable it simple controller

[elfin sphinx]

can you go to view and click on files ??

it will let you see all the stuff thats on the pico's storage

[faint lichen]

it empty

it brand new

[elfin sphinx]

so , you are telling your code to use the ssd1306.py file , but its not actually on your pico , you see whats happening here ?

you need to put that file on the pico

[eager dagger]

^

[faint lichen]

im new so i don't know how it works

[elfin sphinx]

i suggest you checkout some tutorial or smth
i currently am busy with smth so i cant walk you through it atm

but if you got to youtube and type in "micropyton with pi pico" you would find tons of tutorials and guides

[faint lichen]

i actually download some file but i have no idea how to use thonny

[elfin sphinx]

yes , thats when you checkout a guide/tutorial

on how to use tht thing

[faint lichen]

ok

i mess up

[eager dagger]

we have all done it/started somewhere @faint lichen

[faint lichen]

i don't what am doing i put in lib file it still has't found module

[icy crane]

read the docs for Thonny. There you will find info about 'Instlling Modulals". you should be able to figure out how to install PIP3, and the libraries you will need to get the OLED working

Also you should look at Random Nerd Tutorials.. There they have info on how to use MicroPython on a Pico and using Thonny, and implementing an 0.96" Oled .."Hello World"..

[faint lichen]

ok ty

[faint lichen]

i need help it keep giving me error because i can't import i2c device

[elfin sphinx]

could you post another screenshot like yesterday ?

[elfin sphinx]

you need to save your code on the pico itself

make a main.py file on your pico (not inside of the lib folder , outside of that lib folder)

and then paste your main code in there , and then run that

[faint lichen]

ok

it still can't import

[elfin sphinx]

can you psot new picture ?

[elfin sphinx]

You need to upload the whole folder adafruit_bus_device to ur pico, u have copied it partially

[faint lichen]

oh ok that make

sense

now i got new error

[elfin sphinx]

Also make sure u upload the folder as is

[elfin sphinx]

What's the error

[faint lichen]

AttributeError: 'I2C' object has no attribute 'try_lock'****

i'm not sure what it means?

[elfin sphinx]

You are trying to access an attribute that doesn't even exist

Can u send photo ? It will tell me what file is causing the error

[elfin sphinx]

Wait, r u using micropython or circuitpython ??

The Adafruit library is a circuitpython library(I think) , u cant use that in micropython

[faint lichen]

im using pico

which i though they same thing

[elfin sphinx]

pico is the board

micropython or circuitpython are 2 languages that you can use to program your pico

you cant use a circuitpython library in micropython code

you see whats happening here ?

what are you trying to make/do ?

[faint lichen]

yeah i know i was trying make rc with little screen come up top

as in little altoid tin

with wheel and servo everything

[elfin sphinx]

https://paste.pythondiscord.com/MGUQ

can you try this code ? ?

replace the ssd1306 in your lib folder with what i sent

and then use the main.py code i sent

this will check if the screen works or not

and just make sure you replace the SDA and SCL pin (0 and 1) on line 5 in main.py with what you have ( 4 and 5 ) iirc

[faint lichen]

ok

i got OSError: [Errno 5] EIO

i think i got cable wrong

[faint lichen]

it make no sense it said no i2c device found??

[elfin sphinx]

photo of your setup please

[elfin sphinx]

And ur latest code + error

[faint lichen]

im not seeing led on pico there supposed be on right?

[elfin sphinx]

in your code , you say that your display SDA is connected to pin 4 of pico and SCL to pin 5

but is that actually where the pins are connected ?? it looks to me the pins are connected to pin 0 and 1

so its obvious this wouldnt work

@faint lichen

also double check the SCL and SDA wires

[faint lichen]

i did

ok it seems there a address issue thing going on

oled display not found address 0x3c

NVM I GOT IT WORKING

it usb problem it no wonder

[faint lichen]

i don't understand i got it working bu ti switch usb port and now it keep doing same thing

it was working now it back down

[faint lichen]

i totally had just a moment ago

i don't understand it it brand new

[warped pollen]

I assume you are on windows?
For me, in the past, this turned out to be a "USB Hub" issue. Windows for some reason who get a serial adapter stuck and any attempt to use it resulted in Permission Denied as the previous "usage" hung up.
I would move the USB plug to a new port on the hub and it would work again.
When I ran out of the 4 ports, I had to restart the hub.
That's when I realised it was a hub issue and connected direct to a USB port and ... it worked.
It only happened once to me, a long time ago, haven't seen this behaviour since and I do use Hubs.
So YMMV.

So while you are in that error state re-plug your USB hub and see if it clears.

[elfin sphinx]

??

if you want your code to run as soon as you turn on your pico , without opening thonny , make a file called main.py and put all your code in there

you have made Main.py file , not sure if thats causing the issue or not

what exactly is the issue right now ?

[snow shell]

I just taught myself how to solder and made this gem.

I ended up making a Simon game out of this circuit.

[willow star]

Nice!

[cloud hinge]

is there a way to transfer convert everything from vscode platformio to arduino ide super easy? seems seems arduino ide to platform io is much easier for example using .ino for in vscode platformio. would be a nice feature for people who like to switch it over

[hasty pewter]

what compiler are you using

[placid charm]

I am extremely unsure of how to get started with robotics. I am completely unaware of anything and assume, for the simplicity of explaining, I am very stupid.
What should I do? I can only afford an Arduino, not a raspberry pi.

Would the Arduino UNO be a good starting point?

[cloud hinge]

yes an arduino uno is a great start, i started with arduino nano. i recomend the l298n motor controller as its inexpensive and has a ton of features for controlling motors. robojax on youtube has great tutorials for using it along with the needed libraries

[placid charm]

I was looking at this kit which seems to be affordable enough to me... will it be good?
https://www.diyelectronics.co.za/store/kits/948-arduino-uno-basic-starter-kit.html?srsltid=AfmBOorMCIHhOf7Ef1BwivBMi6SEAGv7AmmeT7Rc_35EeBcXqJh8LX5PTdQ

[cloud hinge]

it looks like a nice kit, there are some affordable packages on amazon and ebay too. it pays to shop around. some kits have more components depending on what u need and might be comparible in price. i got the 3 pack of arduino nano clone for a great deal like 2 bucks a piece a long time ago. nano has most of the same features as uno but uno might be a better starting point for easier access to pins

[placid charm]

I don't have eBay in my region. Amazon just arrived recently yet they charge sky high prices, making it less affordable. Also I am not sure if I will like this or not, hence my hesitation to spend too much money on a starter kit. I like this kit, as it comes with the lights and buttons, meaning I will be able to experiment and play around with combinations and see if this is something I wish to build on.

From my university courses of my choice, one of the ones I want to do requires me to be familiar with robotics and these micro controllers, hence, my wish to enter this field.

[cloud hinge]

NIce, makes sense. the cool thing about electronics is sometime you can get the parts off old electronics for certain need projects. not always possible but sometime can work out great . leds and diodes can that way a lot of times. for other things like buttons its possible to desolder with the right tools. need some type of solder sucker

[placid charm]

So this kit will be a good purchase for dipping my toes in?

[spiral sandal]

that alone can blink a led, do wifi, and run python https://www.diyelectronics.co.za/store/iot/1180-esp8266-wemos-d1-r2-wifi-dev-board.html

5volts tolerant except on ADC and apparently cheaper

[placid charm]

Yes but it does not come with any components. I don't have any components...

[spiral sandal]

why not first blink the onboard led ? you don't need component for that

[placid charm]

Yes but then after that I might want to expand. Not to mention this is just a board. There is no cable or anything to attach it to your computer

[spiral sandal]

just findint its gpio number will enjoy you a full week end 😄

[spiral sandal]

this one can use a standard phone microusb cord, or wifi

[placid charm]

I like the kit I posted about as it comes with a breadboard, cables, lights and switches. Simply programming the light on the board is not enough for me. I want to kind of get into it, and I think that the lights, switches and breadboard will allow me to get a good enough feel.

[spiral sandal]

programming the light is everything, that's the point of digital electronic. cabling is just boring and source of failure ( and "magic smoke" )

https://www.rugged-circuits.com/10-ways-to-destroy-an-arduino

[placid charm]

But then if I want to go further I have to buy a whole new kit. And the shipping cost is insane. I'd rather go a little overboard than a little under and then have to pay again for additional components.

[spiral sandal]

problem is "further" and "arduino uno" in the same sentence

[placid charm]

wdym?

[spiral sandal]

if you go further you will go toward STM32 , arm socs or ESP8266/ESP32 and bus with 3.3 volts levels

AVR (arduino uno atmega) are old, expensive, don't have enough sram for beginners and 5 volts

you could as well make your first steps on https://wokwi.com/ and then buy something really usefull

[placid charm]

But I am not even sure what I want to do, or what it is that you are telling me about
Which is why I think it is best that I stick with the beginner kit. It serves as a guideline.

[spiral sandal]

imho you get digital electronics wrong it is more about coding ( the hard way) than wiring, but everybody need to learn one way or another

[placid charm]

Yes but I can use that same beginner kit to code (like you say) and build basic things. Then I can buy more components to build on it and experiment more.

[spiral sandal]

that's exactly NOT how thgings are done nowadays

nowadays we build everything on simulators, run fuzzy tests on them, and only go to prototype after success. That is the only way to lower costs and re-use components efficiently

[placid charm]

Yes but I would still be able to do that with the beginner kit...

[spiral sandal]

wokwi simulator has far more to offer than the more expensive kit in the store you linked

and it should not burn your house if you make a mistake

[placid charm]

Oh yes I have heard of it

[placid charm]

It seems to be what I want
Though I am a little disappointed that I cannot get hands on 😦

[spiral sandal]

you can you just have to look at your pc a different way

eg save an old pc from e-waste, get a few meters of semi-rigid alarm cable + a decent plyer/cutter and begin to play with soundcard as a dual channel ADC , fun oscilloscope + 6 ways pwm output , or parallel port as GPIO in/out

[placid charm]

I am trying to build the basic blink project, but did I do smth wrong?

void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);                      // wait for a second
  digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW
  delay(1000);                      // wait for a second
}```

Ohh my code was wrong

[spiral sandal]

iirc builtin led on uno is on pin 13 and you wired the 8

[tribal burrow]

making new project and I need to pick hardware, anyone got suggestions?

Requirements
Under 10$/€ per microcomputer
Has a digital output for a relay/led
Can open a capacitivePortal
Can connect to wifi with antenna and Ethernet
Easy to code

Thought about esp32 with ethirnet but i dont really like micropython and would prefer python

[elfin sphinx]

the cheapest board that can run full blown python would be a raspberry pi zero /w/2w imo
and those are around $10-15 (depends on if you want wifi or not )

also those are without ethernet. for 5 bucks extra you can get it to support ethernet over usb

but no "microcontroller" like arduino or esp32 will be running full blown python

[spiral sandal]

exceptmaybe http://www.caddit.net/pythond/ running on an esp32 dos emulator 🤣

[spiral sandal]

what don't you like in micropython, maybe it is fixable ?

otherwise under $10 i only know "lichee pi zero" that could run full python3

but wifi/ether will raise the cost

[dry anvil]

Ok, i kinda need some help. Im doing a project where i am going to be using a raspberry pi to make a steering wheel (bc im too poor for an actual one) but i can't find out how to emulate the xbox one or controller inputs i need. Help would be appreciated.

[tribal burrow]

i got like 50% of code that needs to be converted from python to micropython, and there are like libaries that dont exist on micropython but are similar, which kinda defend the purpuse of ease, (Beatiful Soup 4 and Flask would be the 2 biggest concerns for me

[spiral sandal]

hmm given the modules mentionned i'd say you don't want MCU, but more cheap arm socs with at least 512MB ram like *pi boards

[hallow igloo]

can you code the ESP32 in python??

[spiral sandal]

yes and especially those with PSRAM modules

[hallow igloo]

oh ok

[hallow igloo]

what is the strongest microcontroller that esprissif makes?

[spiral sandal]

no idea

[hallow igloo]

same here

[spiral sandal]

note you can also code remotely small MCU that cannot run locally cpython, with telemetrix project

really cool with eg wemos d1 mini ( esp8266 )

[hallow igloo]

ok

you know the cheapest rasberry pi that i can use and buy in bulk maybe?

[spiral sandal]

i think the point of original "pi" is to be not bulk and quite unavailable to keep high prices, unlike "clones" pi ( cheap == where no one is getting paid to write accurate docs/samples/aftersale )

if you want bulk tbh go STM32

[elfin sphinx]

is it actually usable tho?

regular python requires lots of resources

also what version python does it support ?

[spiral sandal]

yeah way too much to be useable, i was advising (micro)python + psram to be comfy

tbh python3.13 does not even fit on WII

[elfin sphinx]

ahh ok
micropython is a different story then

kinda important nuance to point out tho

since most beginners just want to copy paste their regular python code on a microcontroller which wont really work and then they will start asking questions "how do i download requests library in micropython" or whatever

[spiral sandal]

aiohttp ftw !

requests does not work on web properly !

[elfin sphinx]

requests uses aiohttp under the hood right ?

[spiral sandal]

nope it is synchronous

[elfin sphinx]

hmm

what library was it then that was like requests but used aiohttp

i thought it was requests itself lol

[spiral sandal]

httpx can do sync/async iirc but never used it

[tranquil robin]

Hey, I need help with Bluetooth on my pyboard lite 1.0 (MicroPython v1.23.0 on 2024-06-02; PYBLITEv1.0 with STM32F411RE) and HC-05 module.
I have this code:

from pyb import LED, UART
import time


uart = UART(2, 9600)
uart.init(9600, bits=8, parity=None, stop=1)


led = LED(2)
print("Starte HC-05 Kommunikation...")
while True:
    data = uart.read()

    print("Empfangen: {}".format(data))
    uart.write("abc")
    led.toggle()
    time.sleep_ms(250)```
I don't get an error

Empfangen: None
Empfangen: None
Empfangen: None
Empfangen: None
Empfangen: None
Empfangen: None
Empfangen: None
Empfangen: None```

I connect RX from my module HC-05 to X3 and TX to X4. But if I try to send a string per terminal with a serial bluetooth app from android, it doesn't read anything. The app also don't get the "abc". But the connection works, if I am interpreting the led of HC-05 correctly

[lapis talon]

hello :D im completely new to microcontrollers and i have no idea where to begin, is there any specific one anyone recommends to start with?

[cloud hinge]

Arduino uno for simplicity. Once u get that down jump into esp32 for more capabilities and faster processor but wait till u understand arduino uno first as most of the features transfer over to esp32. There are arduino clone knock offs that are good but I'm not sure what ones are good these days

[lapis talon]

okay tysm!

[cloud hinge]

Any time

[cloud hinge]

can acs712 current sensor work with esp32 without adding ressistors? i wasnt able to get any reading on pin 21, 22 or 27 https://github.com/RobTillaart/ACS712

[elfin sphinx]

1. Yes the two resistors are required because the ESP32 ADC can measure between 0 - 3.3 V. But since the ACS module operates at 5V , its analog output will be upto 5V, we need to convert that down to 3.3V so that ESP32 can measure it without being damaged
2. pins 21, 22 are rnot ADC input , and pin 27 is ADC2 input. ADC2 cannot be used if you are using wifi.

[weak bear]

Hello, I try to use a rasspberry for simulate a mouse and recognize the color of a pixel on the computer's screen. The problem is, I have to use only library compatible with circuitpython. Do you have an idea for help me??

[cloud hinge]

awesome feedback thank you, im not using wifi but for some reason pin 27 barely worked with volt meter module connected. maybe it had noise from the cyd display? on pin 27 it was like it was getting a voltage and barely reading more voltage

[elfin sphinx]

cant say anything without seeing the whole circuit diagram , code and error
also you need to be sure that GPIO 27 is not being used by some component on the CYD itself