The circuit of photoelectric controlling

Published:2012/8/21 3:38:00 Author:Ecco | Keyword: Photoelectric controlling | From:SeekIC

Photoelectric control circuit is shown as the figure. NE555 circuit is the core component of the circuit, when photodiode VT receives laser irradiation and turned on, the pin 6 threshold of time-base circuit and pin 2 of trigger end rise above 4V, so the pin 3 outputs low, relay does not pull. When the laser is blocked, VT is turned off, pin 2 and pin 6 become low, pin 3 outputs high, relay is energized, J1-2 pulls to get self-locking, J1-1 pulls to make bells issue alarm sound. The installation can be made according to the following figure, the transceiver end needs to be made as removable or fixed Alert Network. if someone blocks laser path, the alarm emits sound. It can be widely used in warehouse, station temporary heap objects, large area of ​​orchards and other protection applications.



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