"No pull up found" error with SCD-30 and RPi Pico W

[VinnySauce]

Hi all,

I've been trying to set up my Adafruit SCD-30 breakout board with a Raspberry Pi Pico W board and CircuitPython.
I've wired up the SCD-30 using a STEMMA connector as shown here: https://imgur.com/6QNNjwa
I'd expect the following code to work:

Code: Select all

import board
import busio
i2c = busio.I2C(board.GP1, board.GP0)

However when I run this I receive the following error message:

Code: Select all

Trying GP1 and GP0:
Traceback (most recent call last):
  File "code.py", line 6, in <module>
RuntimeError: No pull up found on SDA or SCL; check your wiring

It is my understanding that the SCD-30 breakout board includes 10k pull-up resistors for the SDA and SCL lines, so I shouldn't need to add my own I2C pull-up resistors. Am I doing something wrong?

Thanks in advance!

[danhalbert]

From the photo, it appears that you have not soldered the header pins onto the board. You cannot get good connections without soldering the pins. The error you are seeing would be a symptom of that.

[VinnySauce]

From the photo, it appears that you have not soldered the header pins onto the board. You cannot get good connections without soldering the pins. The error you are seeing would be a symptom of that.

You're absolutely right - getting the pins at the right angle resolves this issue. Soldering iron ordered! Many thanks for your help.