Home Security System Using Cell Phone. Cell phones have switches which when pressed short the terminals (gold plated) hence a number is seen on the screen so what i have done is put my cell phone number on speed dial on the phone i hacked and when this number is pressed for a while i get a call. so basically what we r doing is a circuit that will short the phone terminals. when a intruder enters the house. IC LM358 is a dual op amp. The output of an op amp is difference of the input times the gain of the op amp. ie. it compares the 2 inputs.
NOTE: refer datasheet for ore details about the IC. pin 2 of IC 358 is threshold a potentiometer is connected to it so it forms a voltage divider and a particular voltage is set up at pin 2 which the op amp compares with voltage at pin 3. to pin 3 an LDR is connected it behaves in following way. 2)when the light is cut off by the door which is opened by the intruder the LDR resistance increases hence a more negative voltage is set up at pin 3 which forces output to be low (0v).
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