ESP32 ThingPlus - SAM-M8Q i2c address not found

GPS/GNSS Development Boards
1

I have brand new ThingPlus and SAM-M8Q boards connected by QWICC. Example programs and I2C scanner can’t find the uBlox module.

Do I need to remove the I2c pullups on the uBlox board?

SparkFun u-blox Example

u-blox GNSS not detected at default I2C address. Please check wiring. Freezing.

2

That’s the most common issue (usually occurs with cables longer than 6", or having multiple i2c devices on the same bus)

Are the power/other LEDs on the M8Q lit up?

3

Hi,

Please check you are selecting the correct ESP32 board in the Arduino IDE.

If your ESP32 Thing Plus is this one: https://www.sparkfun.com/products/20168

please select “SparkFun Thing Plus C”, not “SparkFun Thing Plus”.

I hope this helps,

Paul

4

BIngo! Thanks Paul. That was the trick. Guess I missed it someplace in the documentation. Glad to see such an active and responsive forum.

Jim

5

No problem Jim,

That one has tripped me up a few times. The I2C pin numbering is slightly different between the ‘old’ ESP32 Thing Plus ( https://www.sparkfun.com/products/17381 ) and the ‘new’ Thing Plus C.

Glad that’s working for you,

Paul