Sparkfun Thing Plus can't write to I2C board in SDC4x_Arduino_Library

Development Boards ESP32
1

Hi, I have an ESP32-WROOM-32E Sparkfun Thing Plus C with a Qwiic SDC40 CO2 sensor attached. I can do an I2C scan and see the device, but when I use SparkFun’s SDC4x Arduino library, getSerialNumber() fails on the first _i2cPort->endTransmission() (i.e. sensor does not ACK.) If I run the same sensor and library on an Artemis Thing Plus, it works great, so it’s probably not the sensor or wire. Seems to be a software problem somewhere, but I’ve no idea where to look next.

Is the ESP32-Wroom Thing Plus not ready for intro-level Arduino tinkering?

2

It should be…strange. Is the SDC40 the only sensor on the i2c bus?

3

Yes, it’s the only other item on the bus. I don’t have any other QWIIK i2c bus devices, so I suppose the next step is to wire up something else on the pins and see what happens.

4

Yep, try that and we can see if it’s the board or sensor (ostensibly!) - whichever (if) eventually determined to be defective, head to www.sparkfun.com/returns if purchased from us, or contact vendor if purchased elsewhere