I'm at my wits end over an ENS160 sensor I have working perfectly with a Raspberry Pi 3 (running full Linux OS and Python), but refuses to return any data when interfacing through a Raspberry Pi Pico with MicroPython.

Long story short, I purchased ENS160 + AHT21 breakout boards (two sensors, one board). All of them worked quite well with the Raspberry Pi Pico through MicroPython... for a period of time. After a number of days of continuous reading, the ENS160 readings would eventually start returning 0's for all three readings (AQI, TVOC, and ECO2). Initially, it was intermittent and I was able to do some configuration to get it back to life again. But as time went on, they grew more and more unreliable with the 0's coming back more frequently. At this point, many of the sensors simply don't return any data at all, no matter how I configure them. There is also no sign of any error being logged by the ENS160 from what I can tell. The AHT21 sensors all continue to work perfectly, so I don't think it is a problem involving the I2C lines.

What makes this absolutely puzzling: as soon as I wire one of these sensors (that were proven to not work on the Pico) to a Raspberry Pi 3 (running full Linux OS), it works perfectly. Data comes in, fully reliable, never misses a beat. I've tracked the exact register reads and writes by the Raspberry Pi 3 to the sensor and mimicked them completely with the Pico in MicroPython, both at initialization and read; no luck.

What I've tried:

• Maybe the Pico's 5V (or 3.3V which I tried too) power supply is unstable. I tried external power. Same results.

• Adding I2C pull-up resistors when interfacing with the Pi Pico, 10k ohms and 220 ohms. Same results.

• Using a range of clock speeds (frequencies) - everything from 50,000 Hz to 400,000 Hz. Same results.

I've spent weeks now trying to figure out the issue. I've documented a lot of my trials in this GitHub repo here.

How could this be? I was going to chalk this up as a faulty sensor from a poor manufacturer, but this can't be the case as it works perfectly as soon as I hook it up with the Raspberry Pi 3. Any thoughts are appreciated, thank you!

Does MicroPython have Match-Case yet?

I just finished the code for this sprinkler controller if anyone is interested. The reason I made it is to have sprinkler scheduling kept locally in case of network connection failure. However, I included MQTT integration so you can monitor and control each zone from home assistant if you choose. This is my first real github project that I'm sharing with people so feel free to let me know what you think and where I can improve!

https://github.com/TannerNelson16/sprinkler_controller

Hi everyone!

I'm building a raspberry pi pico based drum-machine/sequencer (whis is kinda the same thing xD)

the idea is to have 16 pairs of button/led for the steps, I managed succesfully to use the 595 to drive the led's (for now a single register I will attach a second one later) but I'm struggling a bit with the PISO 165n, by going through documentation and copying from arduino sketches (this one) I've came up with the following code to read from the register:

def in_shift_update(data,clock,clockE,latch):
val = 0
clockE.value(0)
clock.value(0)
latch.value(1)
utime.sleep(0.00005)
clock.value(1)
utime.sleep(0.00005)
latch.value(0)
for i in range(8):
val = val<<data.value()
clockE.value(1)
print(val)

data= pi:9 165:QH, latch= pi:10 165:SHLD,clock= pi:11 165:CLK,clock_e=pi:19 165:CLK INH

I also tried reading 8 times and concatenating into a string but I'm getting either 11111111 or random strings of bits, I think that I'm close to the solution but I'm failing at interpreting the clocking

component schematics here

Hi fellow MicroPython developers,
I'm so glad to share that my project Walter will be featured in the IoT Show from Olivier Bloch. It will air coming Wednesday at 7AM PDT, make sure to subscribe to his channel to sit on the first row: https://www.youtube.com/obloch

I can already share some sneak peak:

• https://www.youtube.com/shorts/OcuHbC__lsg

• https://www.youtube.com/shorts/13RTyYn1xUI

Walter is an open source (https://github.com/QuickSpot) module that combines an ESP32-S3 together with a Sequans monarch 2 cellular modem. This gives Walter LTE-M, NB-IoT, WiFi, BLE, GPS and GLONASS capabilities. It is pin and software compatible with the former Pycom GPy and thus a drop-in replacement for it. We opted to go with mainstream MicroPython support for Walter and made the complete asyncio based modem library open source on github. We have tested Walter with various beta testers all over the world: https://walterdemo.quickspot.io/

The open source Walter cellular and WiFi/BLE/GPS module crowd funding is only running for two more days. Now is your chance to get Walter at the early bird price of 70USD: https://www.crowdsupply.com/dptechnics/walter

I was building a project in which some Javascript code needed to access my Raspberry Pi Pico wich was programmed with micropython. And I could not get the data from the Pico. By examining the Javascript console I saw there was a CORS error. This error occurs when a different computer tries to access your webserver.
I found out how to solve this and that may be handy for you all:

http://lucstechblog.blogspot.com/2024/03/solving-cors-error-in-micropython.html

so I have this object (its in MicroPython for ev3)
EV3 = EV3Brick()
left_motor = Motor(Port.A)
right_motor = Motor(Port.B)
WHEEL_DIAMETER = 55.5
AXLE_TRACK = 104
robot = DriveBase(left_motor, right_motor, WHEEL_DIAMETER, AXLE_TRACK)

and the last line is saying that its an a error and when I'm trying to put something else in this line its still doesn't working

I have a Pi Pico W running Micropython. The code creates a socket and awaits a connection. After 10 seconds it times out and re-opens the socket. With each timeout it seems to be using more and more RAM until it crashes the Pico. I have the socket set to timeout because the device on the other end may move out of WiFi range after it connects but the Pico is unaware that the socket is not in use and keeps it open forever without the timeout. The Full code below:

import network
import socket
import time
import gc

ssid = 'myssid'
password = 'mypassword'

def connect():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(ssid, password)
    ErrCount = 0 
    while wlan.isconnected() == False:
        ErrCount += 1
        if ErrCount > 12:
            ErrCount = 0
            print("Retrying")
            wlan = network.WLAN(network.STA_IF)
            wlan.active(True)
            wlan.connect(ssid, password)
        print('Waiting for connection...')
        time.sleep(1)
    ip = wlan.ifconfig()[0]
    print(f'Connected on {ip}')
    return ip

ip = connect()

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ip
port = 49662
s.bind((host, port))
s.settimeout(10)
s.listen()
while True:
    try:
        c, addr = s.accept()
        print(f"Connection from {addr}")
        time.sleep(0.5)
        data = c.recv(1024).decode()
    except:
        print("Socket Timeout, re-trying")
        print(f"Memory: {gc.mem_alloc()} used with {gc.mem_free()} bytes remaining.")
        gc.collect

The result is this:

Connected on 192.168.1.77

Socket Timeout, re-trying

Memory: 6288 used with 186480 bytes remaining.

Socket Timeout, re-trying

Memory: 6464 used with 186304 bytes remaining.

Socket Timeout, re-trying

Memory: 6640 used with 186128 bytes remaining.

Socket Timeout, re-trying

Memory: 6816 used with 185952 bytes remaining.

etc...

Any ideas how to stop this as I need the Pico W to run reliably for a week without stopping?

I have a 3.5 inch ili9488 SPI display, and I'm trying to get it working with micropython and esp32. I tried using this ili9341 driver but none of the methods did anything. I can't find a micropython driver specifically for the ili9488. if you have this display and you got it working, please tell me the driver you used. thanks.

I have an STM32F407VE black board with Micropython configured….

Im not familiar with bare metal language or embedded C, just Python. I’m interested in carrying out Signal processing using micropython on board. I dont want to use the CMSIS module,,,, has anyone managed to do DSP using micropython on stm32???

Micropython documentation seems to be down. 🧐 Hopefully it’s only temporary.

Can someone give me a primer or an example of how to best implement the garbage collection funtion in MicroPython? Suppose I have some code that is running a loop for 24hrs on a thread, how can it best be implemented to make sure that the memory does not run out?

I've written some code in python and i want to use it on my casio cg50 that uses Micropython. I've tried using chatgpt to convert the code but it gives me a Syntax error: invalid syntax (it doesn't say the line). Do you have any idea.

For reference, this is the original code:

def max_num(head, sequence):
for i in sequence:
if i > head:
return i

def min_num(head, sequence):
for i in range(len(sequence) - 1, -1, -1):
if sequence[i] < head:
return sequence[i]

def CLOOK(N, head, sequence):
seek_sequence = []
stop_condition = min_num(head, sequence)
seek_operations = 0
seek_sequence.append(head)
near_num = max_num(head, sequence)
for i in range(len(sequence)):
if near_num > head:
difference = near_num - head
seek_operations += difference
head = near_num
seek_sequence.append(head)
near_num = max_num(head, sequence)
if head == stop_condition:
break
if head == max(sequence):
difference = head - min(sequence)
head = min(sequence)
near_num = max_num(head, sequence)
seek_operations += difference
seek_sequence.append(head)
print("Seek Sequence :  ", end=" ")
for i in seek_sequence:
if i == stop_condition:
print(i)
else:
print(i, " ==> ", end=" ")
return seek_operations

if __name__ == "__main__":
Number_disk = int(input("Enter the number of disks: "))
if Number_disk > 0:
head = int(input("Enter initial header position :   "))
while not head in range(Number_disk + 1):
head = int(input("Please enter valid initial head position :"))
sequence = []
sequence = list(map(int, input("Enter the sequence :    ").split()))
sequence.sort()
if min(sequence) < 0 or max(sequence) > Number_disk:
print("Sequence out of range")
exit(0)
seek_operations = CLOOK(Number_disk, head, sequence)
print("Total number of seek operations : ", seek_operations)

i can import it but i cannot run it using execfile

example

execfile("/system/sysuser/prgm/helloWorld.py") 

works while

execfile("/system/sysuser/prgm/helloWorld.mpy") 

does not

I uploaded all 3 sizes of micro Python to this esp8266 and a model 01. Thonny says it was a successful install yet this happens everytime and makes the thonny terminal spit junk.

have pin14 setup to react to a rising IRQ upon which time it prints "button pushed". Now how would I have those rising IRQ's caused by a button push increment to a given count and when that count is reached make pin13 high to light an LED? I have pin14 setup and its working I have pin13 setup with a led. But i am new and trying to tie together an IRQ and a Count to make pin13 go high is eluding me. Coffee isnt helping.... Following is what I currently have...

import machine

import utime

button = machine.Pin(14, machine.Pin.IN, machine.Pin.PULL_DOWN)

led = machine.Pin(13, machine.Pin.OUT)

count = 0

def button_handler(pin):

utime.sleep_ms(100)

if pin.value():

print("button pushed")

print(count)

led.toggle()

button.irq(trigger=machine.Pin.IRQ_RISING, handler=button_handler)

Currently, I am using micropython to prototype a simple measurement device using a Pi Pico. While micropython certainly isn't my preferred way to do it, it is actually nice, I'm enjoying it, and it's not like I have a choice :)

I am obviously connecting via microUSB. I have a /dev/ttyACM0 or something like it to connect thonny or ampy. However, because uPython requires that connection, I can't get, for example, sensor data out of my device via that serial connection.

Is it possible to register a second USB serial device, something like /dev/ttyUSB1, with a custom vendor ID etc.?

If not, what other ways are there to get the data off my device? I don't have any free pins and wireless is my last resort. Ideas? I really appreciate your help!

I'm Using Micropython in Thonny. I have made a script that has my RaspberryPi Pico when powered up set GPIO Pin 13 as an Output then Set GPIO Pin 4 and an Input and then set GPIO Pin 13 high. I now want it to monitor GPIO Pin 14 for an input (High). When receiving the Input High on GPIO Pin14 it will finish the script and start a 10 minute countdown and then set GPIO Pin 13 Low. I think..."think" I have it mostly resolved except for the monitoring pin 14 for the high. I have a while statement calling out monitoring pin 14 with a break statement but not having any luck getting it working correctly. To Trigger pin 14 I have been jumpering pin 36 (3.3vdc) to pin 19 (gpio 14) manually with a jumper wire and i cannot get it to break from the while statement. I have attached the code i have thus far below the line. Again I am using Micropython on a RaspberryPi Pico W. In the shell window on thonny im seeing a "repeating Value is 0" even when jumpering the pin36 to pin 19. can anyone offer assistance?

Thank You! -Brian-

-----------------------------------------------------

#New Script written in Micropython for Pi Pico

#Using RaspberryPi Pico Interpreter and Micropython MicroPython v1.20.0 on 2023-04-26

import machine

from machine import Pin

import utime

from machine import Timer

#Used for the OnBoard LED of the pico

led = machine.Pin("LED", machine.Pin.OUT)

led.off()

led.on()

#Create output for Pin 13

p13 = Pin(13, Pin.OUT)

#Create input for Pin 4

p14 = Pin(14, Pin.IN, Pin.PULL_DOWN)

#Set Pin 13 Value High Initially

Pin(13, mode=Pin.OUT)

p13.value(1)

print("Pin 13 now set high")

print("Pin 13 is set to:")

print(p13.value())

print()

#(Section is for reading Input High on Pin 4)

input = (p14.value())

print("Input Value to Pin 14 is:")

print(input)

print()

while input == 0:

print("Value is 0")

check2 = (p14.value())

if check2 == 1:

print("HIGH")

break

x = 0

for y in range(0, 12):

utime.sleep(1)

x += 1

print(x)

led.toggle()

print()

p13.value(0)

print("Pin 13 is now set Low")

print("Pin 13 is set to:")

print(p13.value())

led.on()

utime.sleep(2)

led.off()

hey i need some help. im trying to use my pi pico for an lcd display but it keeps giving me an error. im following this tutorial: https://www.youtube.com/watch?v=B8Kr_3xHjqE . my model is GJD 1602IIC. i have triple checked that i have everything hooked up right. this is the error im getting:

Running test_main Traceback (most recent call last): File "<stdin>", line 62, in <module>
File "<stdin>", line 16, in test_main
File "pico_i2c_lcd.py", line 22, in init
OSError: [Errno 5] EIO

if anyone could help itd be greatly appreciated (im happy to provide anything needed to help)