https://3dpellet.com/tags/hc-sr04/ Recent content in HC-SR04 on 3D Pellet Hugo -- gohugo.io en Sat, 28 Mar 2026 10:00:00 +0100 https://3dpellet.com/tutorials/arduino/sensors/hc-sr04/ Sat, 28 Mar 2026 10:00:00 +0100 https://3dpellet.com/tutorials/arduino/sensors/hc-sr04/ The HC-SR04 is one of the most popular sensors for measuring distance with Arduino because it is inexpensive, easy to connect, and very useful in educational projects, robots, and detection systems. It works by sending ultrasonic waves and measuring how long the echo takes to return to the module. In this article we will see what the HC-SR04 sensor is, how it works, what its pins do, how to connect it to an Arduino board, and how to display the measured distance in the serial monitor with a simple program.