Raspberry Pi + HC-SR04 Ultrasonic Distance Sensor: Wiring, Code and Accuracy Tips
Exploring how the HC-SR04 ultrasonic sensor measures distance using sound, and how to wire and program it on a Raspberry Pi.
The HC-SR04 is a popular and inexpensive ultrasonic distance sensor that measures range using sound waves. In this post, we connect it to a Raspberry Pi, explain the electronics behind the Trig and Echo pins, build a safe voltage divider for 3.3 V logic, and write a simple Python script to read accurate distance measurements. We’ll also touch on accuracy limits, environmental effects, and how ultrasonic interference can impact your readings.
