UpcyclingMindstorms Use Mindstorms peripherals on Arduino API https://lmoellendorf.gitlab.io/UpcyclingMindstorms Mindsensors LineLeader See the user guide of Line Follower Sensor for NXT or EV3. I2C Wiring EV3 Wire Function blue SDA yellow SCL green 5V red GND black GND (not used) grey analog (not used)