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You are here: Home / Replies / its very simple.LDR based

its very simple.LDR based

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Electronics › Electronics › pls help me Out. › its very simple.LDR based

April 22, 2014 at 12:11 pm #11611
Ashutosh Bhatt
Participant

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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