The HC-SR04 Ultrasonic Distance Sensor is a popular module used to determine the distance to an object through ultrasonic sound waves. It’s a great choice for robotics and automation projects where obstacle detection and avoidance are essential.
This sensor operates using sonar-based technology, featuring a pair of ultrasonic transducers—one acts as a transmitter and the other as a receiver—along with an onboard control circuit. The transmitter emits high-frequency ultrasonic pulses that reflect off nearby objects. These reflected waves are then captured by the receiver. By measuring the time interval between sending the signal and receiving the echo, the control circuit calculates the distance to the object.
The HC-SR04 is simple to use and compatible with various microcontrollers such as Arduino, ESP32, Raspberry Pi, and others, making it highly versatile for DIY electronics and embedded system projects.
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