Consider a 8051 Microcontroller based Home Security System which will help in detection of entry of unknown person when no one is at home, It would also have fire alert, power failure, LPG gas leakage. It could use PIR detector (Passive Infrared) which senses the presence of living beings. The increase in amount of gas above the threshold of the detector could give an interrupt to the controller which would send an alert through Sound Alarm or Mobile SMS. Fire is sensed by fire detector which will give low signal to the interrupt of controller and thus an alert can be generated.
For sending SMS alert, microcontroller has to be connected to DB9 using MAX 232 for serial communication. A moblie which has DB9 female as data connectivity can be connected to controller and can send pre defined SMS to the particular number.
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