5V Ultrasonic Sensor with RGB Colorful Lights

Ultrasonic Module with RGB Light Distance Sensor Compatible HC-SR04 obstacle avoidance sensor for Arduino Smart Car Robot. This economical sensor provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC-SR04 module includes an ultrasonic transmitter, a receiver, and a control circuit. There are only 6 pins that you need to worry about on the HC-SR04: VCC (Power), Trig (Trigger), Echo (Receive), RGB, In pin, and GND (Ground). The basic principle of work