Ultrasonic HC-SR04 Sensor

Category : Arduino, Electronics

I’ve stumbled by this neat little sonar sensor on eBay a few days ago, I’ve had some bad experiences with other similiar ultrasonic sensors so I was kind of skeptic to this one. But for the low price I couldn’t resist. Anyhow, it turned out to be a great sensor. It’s accurate down to 1 cm, which is perfect and in most cases more than enough. You get it for around 5$ on eBay.

 

Only problem I ran into when using it with arduino was the library, got some nasty compiling errors. So I changed a few lines in the library and made it work with Arduino 1.0 and older arduino IDEs.

Download HC-SR04 Library for Arduino 1.0

Also wrote a little example for using it with a serial display:

 

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