SunFounder Obstacle Avoidance Smart Car Obstacle Avoidance Sensor For Arduino UNO R3 Mega2560 Mega328 Nano Module interface specification (3-wire) 1 VCC external 3.3V-5V voltage (can be directly connected to the 5v microcontroller and 3.3v microcontroller) 2 GND external GND 3 OUT board digital output interface (0 and 1)