HC-SR04

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Detecting obstacles using an ultrasonic sensor HC-SR04

Detecting obstacles using an ultrasonic sensor HC-SR04

HC-SR04 is a commonly used ultrasonic sensor which is capable to detect obstacles in a range of 2-300cm. The sensor looks like a small PCB having two metal cylinders on the front-side and a small circuit on the back-side (see Fig.1).

In this article we will provide a simple demo to use HC-SR04. This requires a preliminary read of the sensor user manual: HC-SR04 User Manual

The sensor has 4 PIN:

VCC, which must be connected to 5V; Trig, which is an input PIN to trigger the measurement; Echo, which is an output PIN which sent out a square wave; GND, which must be continue reading...