Access room people number counter circuit

Published:2011/6/8 3:04:00 Author:Christina | Keyword: Access room, people number, counter | From:SeekIC

Working principle: Two pairs of photoelectric detection devices are installed in the access channel. On one side the light source A (transmitter) and the photoresistor LDR1 (receiver) are installed in the entrance of the channel; on the other side, the light source B (transmitter) and the photoresistor LDR2 (receiver) are installed in the outlet of the channel. The two beams of light need to illuminate on the receiver's photoconductive resistance, and the light beams require the precise orientation. The light source and the receiver's installation location is as shown in the figure. Components selection: The IC1 uses the 7809, 9V regulator ; the IC2 uses the CD4093 four-two input trigger, the IC3 uses the four-two input AND gate.



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