The HC SR04 Ultrasonic Range Finder bounces sound waves off from objects and detects the echoed sound waves to be able to measure the distance between itself and the objects in front of it.
- Input Voltage: 5 VDC
- Detection Angle: Approx. 15 degrees
- Detection Distance: Approx 1" to 16'
- Resolution: Approx. 1/8"
Example code for the Arduino platform can be downloaded here.