XIAO Expansion Board Base I2C - NoPullup/AllAdresses

Hi there, i have 3 Expansion Bords, every single one shows a different behaviour:

I’ll try to read values from 2 Sensors (co2/vdoc and temp/humidity)

One of the boards are showing the right values on the board display, so the code is working…

…but the other one says "no pullup Resistors found, check your wiring. The third one is showing just gibberish and an i2c.scan() brings up 120 (or kinda) active i2c-addresses.

Are they broken? and how? i just put the mcu and sensors on it

i just read that there where problems with XIAO BLE and the Expansion Boards (regulator, 3,3V)

-…i use a nrf52840 Sense for said Boards, so it seems that it could be the bug. what now?

Hi there,

Seems a little wacky for sure, Try to run a couple of the DRAG and DROP uf2 files in the ZIPs from the Xiao Expansion test thread HERE
try the basic ones and see if all three units perform the same.
HTH
GL :slight_smile: PJ :v:

i HAVE NEVER NOTIVED THAT PROBLEM, HAVE YOU TRIED DIFFERENT xIAO’S?

the same… 1 working;2 don’t… tried different mcu’s

yep, nRF52840, ATSAMD21

i’d like to try again with rp2040 if they’ll,arrive