The Parallax PING Ultrasonic Sensor provides a low-cost, precise and non-contact distance measurement. This sensor is perfect for applications that require you to perform measurements between moving or stationary objects.
Apart from the robotics applications it is also very popular in security systems or as an infrared replacement. The activity status LED and the economic use of 1 I/O pin makes it an efficient and effective product.
The Ping sensor measures distance using sonar; an ultrasonic (well above human hearing range) pulse is transmitted from the unit and distance-to-target is determined by measuring the time required for the echo return.
