Distinctive Merit

Simple Laser Diode Speed Detector
The Simple Laser Diode Speed Detector, which is based on the H8S/2329 16-bit microcontroller, measures the speed of a remote-controlled car. The simple system requires only a handful of electronic components, including a pair of photoresistors, two laser diodes, and 10-kW resistors. The laser diodes are located at a fixed distance apart. When the car passes the first laser, the timer is triggered to start. The timer stops when the car passes the second laser. The speed is calculated (speed = distance/time) and then displayed on a 2 × 16 LCD. The speed detector’s low cost and simple yet effective measurement technique make it a good candidate for numerous other applications.

Anthony Chau
Canada
anthonychau@canada.com

Abstract | Entry