# Ultrasonic Distance Sensor (HC-SR04)

- Link: https://www.stem26.com/product/ultrasonic-distance-sensor/
- Published: 2026-11-05T18:55:51+00:00
- Author: diy

Gives your robot eyes. Sends a pulse of ultrasound and times the echo to measure
distance.

 * Range 2 cm – 400 cm, ±3 mm
 * 5 V supply, 4-pin header
 * Works with UNO, Nano and ESP32 (with level shifting)