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The auto light control circuit of photoelectric couplers

2014-11-07 12:07  
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The auto light control circuit of photoelectric couplers
See as the circuit, in the 4 teams of analog electric switches(SI~S4), S1, S2 and S3 are in parallel connection, and they are used in the time delaying circuit, when they are connected with the power supply, they drive the dual-way transistor VT by R4 and VB6, VT directly control the hall lights; S4 and the external light dependent resistor RL form the outside ray detection circuit. When the door is closed, the closed type dry reed pipe KD, which is installed on the door frame, is affected by the magnet and it cut off, then S1, S2 and S3 are in open state. When the owner comes home at night, the magnet is away from KD, the KD touch spot is closed.