Pyroelectric automatic door control circuit

Posted on Mar 28, 2007

Automatic door control circuit diagram. Human motion detection using the new pyroelectric infrared detection module HN911. VT used as a delay control by adjusting potentiometer

Pyroelectric automatic door control circuit
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RP, can change the delay time control dummy. Optocoupler tuner MX: 3020 from AC and DC isolation. When no one walking time. HN911 output terminal O is low early. VT No control signal output, Triac vs closed, the load electric machine does not work, the door is closed. When someone approaching from the time gates. HN911 module detects infrared body radiation energy, the output terminal O is high, two-way goods thyristor VT2 conduction, load motor working, open the automatic doors. When the automatic doors running in place, by the limit switch S off the power. Since HN911 output of block output level and the output of the opposite O level, it can be used the output terminal output control automatic door closed.

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