ABSTRACTABSTRACT

An “Electronic Door Guard” sounds to inform that somebody is at the gate.

555 Timer IC

The system has mainly two parts: Transmitter Receiver

Transmitter CircuitTransmitter Circuit

Receiver Circuit

Applications

It can be used in houses, offices, jewelery shops for security and anti-theft purpose.

It can also be used as door bell or burglar alarm.

Limitations and scope for further improvement

It uses the concept of IR transmission and reception. So only when anyone interrupt the IR beam the bell will ring.

If motion sensor is used then it will detect anyone in the radius of 5-10 metres.