There are so many circuits available for infrared Burglar alarm but transmitter section of these burglar alarm circuits are complicated and you may have assemble it yourself. But here is burglar alarm circuit that uses the ordinary DVD remote as the transmitter. So not only the cost also the man power will be saved. You only need to press and hold any switch of the remote control to allow flow of IR signals to outside. This can be done by grafting any key of the remote using insulation tape. This house alarm is very useful and doesn't require much components.
Circuit Diagram of Infrared Burglar Alarm: Click to enlarge
Working
The transmitter and receiver circuit must be fixer either two side of the gate or door.Now the IR signal from the remote control recieved by the sensor TSOP 1738 and give it to the 555 IC input. The output of the 555 IC will be high only when it recieves the signals and this biases the transistor BC107 so the relay is activated. Whenever any obstructives come between the transmitter and receiver, the 555 output become low and the transistor SL100 that connected to the relay will be on and the UM66 will produce an alarm sound.
Note
- Assemble the circuit in a common PCB
- Supply voltage to the circuit is 9V
- 3V is required to operate the remote
- The sensitivity range is maximum 8 meters
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