Some sample code used during MCHE 470: Robotics at the University of Louisiana at Lafayette. - DocVaughan/MCHE470-Sample-Code ...

The Arduino Uno R4 WIFI provides one I2C bus on the pin header, which has no pull-ups on the board. Thus, we need to connect a pull up resistor between SDA and VDD and SCL and VDD. In the example two ...

I2C also requires pull-up resistors on the data (SDA) and clock (SCL) buses. We used two pull up resistors soldered to the 5 volt output of the Arduino shield and SCL/SDA.