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One Direction Motion Sensor Circuit Diagram

The following motion sensor circuit is made to detect an object which passing in one direction, and ignoring objects going on the opposite way. Two sensors is used to identify the one direction movement. The principle of this circuit is, where one sensor is used to generate a short pulse, the other sensor is used to block and turn off the gate. The phototransistors will give high output on their collectors when there is any object blocking the light. The interruption of light at Q2 sensor will produce short pulse at point C by a 0.4uF differentiator capacitor. However, this short pulse will appear only at the output if a high signal appears at A. Here is the circuit diagram from :



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