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The HC-SR04 performs non-contact distance measurement, capable of detecting objects from 2cm up to 400cm using ultrasonic sound waves, and it's one of the most widely used and well-documented distance sensors in hobby electronics for exactly that reason: it's inexpensive, reliable and works with a well-established measurement technique that essentially every microcontroller platform has existing library support for.
It integrates readily with microcontrollers like Arduino for robotics, obstacle detection and IoT applications, sending an ultrasonic pulse and timing how long it takes to bounce back off an object, with distance calculated from that time-of-flight measurement.
Operating voltage is 5V DC, with average current consumption of just 2mA, keeping power draw modest for continuous use on a battery-powered robot. The sensor operates at a 4000Hz ultrasonic frequency, with a sensing angle of 15 degrees, giving a reasonably narrow, focused detection cone that helps avoid picking up unwanted reflections from objects off to the side. Maximum sensing distance is rated at 450cm, slightly beyond the commonly quoted 400cm figure.
Its accurate non-contact measurement, fast response time and stable performance, combined with low power consumption and a compact, lightweight design, are exactly the traits that have made it a default choice for countless obstacle-avoidance robots, parking sensors and simple distance-measuring tools built by hobbyists.
Anyone building a robot that needs to detect and avoid obstacles, a simple parking-assist device, or a general distance-measuring project will find the HC-SR04 a proven, well-documented, low-cost standard for the job.
2cm to 400cm.
5V DC.
About 2mA average.
15 degrees.
Obstacle detection, robotics distance measurement and general non-contact ranging.
| Brand | Generic |
|---|---|
| Operating Voltage | 5V |
| Selling unit | PCS |
