Motion and Speed detector

Discussion in 'General Electronics Chat' started by sihaam, Nov 4, 2009.

  1. sihaam

    Thread Starter New Member

    Nov 4, 2009
    Hello all
    We rquire a sensor circuitwhich will be mounted about 5 meters away from the gate entrance. When the car approaches, it must detect the speed. This speed must be able to be set on the sensor with a simple pot and lcd screen. (Turn the pot up-down to increase/decrease the speed). When the sensor detects any set speed, it must trigger off a relay. That is all. Is there any such circuit available :confused:
  2. mik3

    Senior Member

    Feb 4, 2008
    There should be of the shelf devices in the market but in case you can't find one you can build one with ultrasounds.