GPS-RTK2-SMA I2c and USB-C connection fails

[PaulZC]

Hi @grumpy ,

The Qwiic port on the R4 WiFi is Wire1 - not Wire. Please see this issue for the details:

GPS-17285 trouble

Hi @mpicco , Yes, you need to include Wire1 when you begin the GNSS: if (myGNSS.begin(Wire1) == false) //Connect to the u-blox module using Wire1 port I just tried Example21_ModuleInfo and it is working well for me: [image] My setup: Arduino IDE 1.8.19 Arduino UNO R4 Boards 1.0.5 Board: Arduino UNO R4 WiFi SparkFun u-blox GNSS Arduino Library v2.2.27 NEO-M9N breakout connected via Qwiic The I2C jumpers are closed on my NEO-M9N breakout Two code changes are needed: Wire1.begin(); and if (myGNSS.begin(Wire1) == false) //Connect to the u-blox module using Wire1 port I hope this helps, Paul

I hope this helps,
Paul