I2C Qwiic Connector

 
ss

		J2 JST Connector PINS  J3 Connector Labels   1 - GND     GND  2 - I2CVCC  VCC  3 - I2CSDA  SDA  4 - I2CSCL  SCL NOTE: It would be better if J3 had the same labels as J2. All these signals are at the voltage levels of the the  external device, which can differ from the Arduino 5V.
		Arduino Pin  I2C Signal  A4  SDA  A5  SCL

s

IMPORTANT NOTE:  The Arduino UNO default pins for I2C are D19 SCL and D18 for SDA, but the ZXPS uses pins A5 for SCL  and A4 for SDA.
This generally means you will have to edit the I2C pins assignment in Arduino I2C Example Sketches.