A security system having a single laser beam may not be very effective as any moving object or animal can interrupt it, causing a false alarm. Presented here is a laser security system having two laser beams with calling alert feature, using a basic mobile phone (old model), also known as feature phone.
The security system can be used in a restricted area like a farm or as a home security system. When an intruder cuts or interrupts both laser beams at the same time, an alarm sound is generated and an alert call is made to your current mobile phone.
The circuit works off a 6V battery or power supply.
Switch S1 to off position during installation of the laser beams and LDRs.
The project requires two mobile phones—one old basic feature phone, which will be connected to the circuit, and the other could be the mobile phone you may already be using.
Normally, button 1 on a feature phone is assigned for speed dial function. Open the cover of the dial pad of this feature phone. Solder two wires on the PCB at 1. Extend these wires to CON2 in the circuit.
You can install the two laser beams at a slight distance from each other, depending on what you want to guard against. For example, to guard your farm against cattle, keep the two laser beams about 90cm apart, so that the animal interrupts both the laser beams when it crosses the gate of your farm. As soon as animal enters your farm, this system will alert you, and you can take instant action. With the two laser beams kept 90cm apart, a human being crossing the gate of your farm will not produce an alarm or send an alert to your mobile phone, thus preventing a false alarm.
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- dondon pramis
- Location: Philippines