Raspberry Pi HC-SR04
HC-SR04 Ultrasonic Sensor The HC-SR04 ultrasonic sensor is a low cost ultrasonic ranging sensor which provides non-contact measurement functionality in a range from about 2cm to 4m. The sensor consists of a small circuit board containing an ultrasonic transmitter, receiver and control circuitry. It also has 4 pins; 2 for […]

HC-SR04 Ultrasonic Sensor