SparkFun CO₂ Humidity and Temperature Sensor - SCD41 (Qwiic) no address given when sensor is polled

Qwiic System
1

SparkFun CO₂ Humidity and Temperature Sensor - SCD41 (Qwiic)

https://www.sparkfun.com/products/22396

When connected to our raspberry pi with the Quiic shim (SparkFun Qwiic SHIM for Raspberry Pi DEV-15794) and using the I2C detect command from the terminal window, the SCD41 does not return an address. We have other sensors (SparkFun Ambient Light Sensor - VEML6030 (Qwiic) SEN-15436) connected to the same setup without issue.

We have tried disconnecting all other sensors except the SCD41 to no avail. According to the SCD4x data sheet we should be seeing the “0x62” address when polled, or any address it chose for that matter.

There is NO response from the SCD41. We believe we have a bad board.

The Command run from the terminal window on the pi “i2cdetect -r -y 1” returns no addresses when the SCD41 is connected by itself, returns ambient light sensor address when it is connected by itself or with the SCD41 (either in front of or behind the CO2 sensor board).

We believe this is an issue with the sensor hardware, please advise on our next course of action.

2

Try disabling the i2c pull-up resistors on the rear-side of the board (cut the traces between the “i2c” pads on the physical PCB)

If that doesn’t work feel free to request a replacement (www.sparkfun.com/returns if purchased from us)

3

We cut the traces and still no address given. I’ll put in the request for an exchange. thanks