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Please I am a Final year Student, please I want to do a project on controlling like four (4) interface on a pic16f877a. Its an intruder alarm system that is triggard by a lasser, a pressure switch, a conductor when it is cut. Please help me with the circuit diagram
Ok Sir, I intend to use a lasser light and a pressure sensor. That is to say, I want to position lasser transmeter and recvers srategically so dat any thing that cut across the lesser, it will trigger the alarm, and a “SAFE” will b placed on a pressure sensor, once the save is lifted, it will as well trigger the alarm Sir. Thanks in anticipation.
its very simple.
LDR based monostable multivibrator circuit using IC555
this circuit will give high output pulse when light falling on LDR interrupts. use this pulse to give trigger to ur micro controller.
similar circuit you can build for pressure sensor/switch
you have to detect high to low (or low to high) transition on micro controller pin.
actually you dont require micro controller for such application. alarm can be directly triggered by IC555
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