PiicoDev Sensor - Connection error

[vabm]

Hi
I am following the tutorial to test the Atmospheric Sensor (BME280) on my Raspberry Pi Pico, and I keep getting OSError: [Errno 5] EIO
Here is the full error:

MPY: soft reboot
PiicoDev could not communicate with module at address 0x77, check wiring
Traceback (most recent call last):
  File "main.py", line 9, in <module>
  File "PiicoDev_BME280.py", line 32, in __init__
  File "PiicoDev_BME280.py", line 29, in __init__
  File "PiicoDev_BME280.py", line 64, in _read16
OSError: [Errno 5] EIO
MicroPython v1.19.1 on 2022-09-13; Raspberry Pi Pico with RP2040
Type "help()" for more information.

I connected and disconnected all the cables, rebooted the computer, etc., but keep getting the same error.

I thought something could be broken, but the sensor’s light is on, and I tested the Pico following the Led tutorial. Seems to be working fine

Any help would be great.
Cheers

[ShaneC]

I’ve had the same issue with my Pico W, I think it’s an issue with the latest nightly build of micropython.

It’s also been mentioned here: PiicoDev with the Pico-W - #6 by James46717

I think if you go back a couple of versions of micropython it will work, otherwise hopefully the issue gets ironed out soon!

[vabm]

Thanks @ShaneC!
I went back to MicroPython v1.18 and that solved the issue

[Phil204480]

Im having the same issue using
rp2-pico-w-20220926-unstable-v1.19.1-451-gbdbc44474.uf2

%Run -c $EDITOR_CONTENT
PiicoDev could not communicate with module at address 0x77, check wiring
Traceback (most recent call last):
File “”, line 9, in
File “PiicoDev_BME280.py”, line 32, in init
File “PiicoDev_BME280.py”, line 29, in init
File “PiicoDev_BME280.py”, line 64, in _read16
OSError: [Errno 5] EIO

anyone got this working?

[Trent5487676]

Hi Phil,

There is a bug in the nightly build for the Pico W that breaks the I2C interface, unfortunately that bug has now been baked into every nightly release firmware version on the micropython site.

James has found a pre-release version of the Pico W firmware that does not feature the bug, you can find it in his thread below.

Raspberry Pi Pico W I2C/Piicodev Bug [Solved]

Hi Guys, We’ve had a few reports of I2C issues with the Pi Pico W (i.e. when using PiicoDev gear), shown below: [image] We believe this is due to bugs in recent MicroPython builds. Below is a nightly build we have verified to work: rp2-pico-w-20220831-unstable-v1.19.1-358-g0b26efe73.uf2.zip (495.8 KB) Just extract it and copy it over to your Pico as you did when you first set up MicroPython. Here’s an image of us using this build with a PiicoDev BME280: [2022-09-26_17-02-01_IMG_2095] L…

[Phil204480]

Hi Trent, thanks for the info.

I can confirm that this has now resolved this!