







This ultrasonic sensor module combines distance measurement capabilities with a built-in RGB LED indicator, making it ideal for visual feedback applications. Powered by 5V, it is compatible with microcontrollers like Arduino, ESP32, and Raspberry Pi, and is suitable for both educational and functional robotic projects.
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