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Infrared Remote Control Antitheft Coded Lock Circuit

2017-01-07 03:44  
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Infrared Remote Control Antitheft Coded Lock Circuit
YYH26 and YYH28 can compose at least 4 million different groups of codes when these two are working in pairs. It is very different to decipher so it will be very safe. In the circuit, YYH26's pin 1-8 and pin 10-13 are 12 encoding terminals respectively which are corresponding to decoder YYH28's 12 address ports pin 1-8 and pin 10-13. Each encoding terminal can have 4 states(connect VDD,VSS,be suspend in air, or be connected to pin 1 4TH). Only when the encoding switch state is corresponding to the decoding address state, the decoder YYH28can output high level from pin 17. Emitting circuit: The 40kHz oscillator composed of CD4011 will output encoding content of YYH26 through 9012 push infrared ray transmitting tube. When encoding is correct, the receiver can output high level through IC2's pin 17 and unlock the lock by 9013 driven relay. When the door is closed, the control switch S' which is set on the door will be disconnected. Then the silicon control's control stage is disconnected because of low level.