DIY Arduino Low-Tech Home Security System
So, a friend of mine kept complaining that some racoons would always sneak into her yard over the fence and make a huge mess. But, the problem was, she couldn’t tell when or from which side of the fence were they coming in from.
I decided that the best way to detect any intrusion would be through PIR (Passive Infra Read) motion sensors. But as multiple sensors would need to be placed on each side of the yard, we’ll have to try a wireless approach otherwise laying out thin wires along the yard’s perimeter would be very impractical and would also be subject to wear and tear caused in the outdoors. To accomplish this we used 433 Hz RF modules with three transmitters and one common receiver.
Things you’ll need
3 Arduino Nanos: https://www.amazon.com/Arduino-Elegoo-ATmega328P-without-compatible/dp/B0713XK923/ref=sr_1_1_sspa?s=electronics&ie=UTF8&qid=1506847402&sr=1-1-spons&keywords=arduino+nano&psc=1
3 433Hz Receiver/Transmitter pair: https://www.amazon.com/433Mhz-Transmitter-Module-Receiver-Arduino/dp/B00G86L87E
The Receiver Circuit
The receiver circuit is comprised of an Arduino Nano, Three multi-coloured LEDs and the 433 Hz receiver and the whole circuit will be powered by the Arduino itself via USB.
The Transmitter Circuit
Each of the transmitter circuits has an Arduino nano for itself, a PIR motion sensor and a 433 Hz transmitter.
And here’s a video demoing the circuits:
The real world applications go beyond knowing whether there are racoons in your yard or not. This acts as a DIY security system for your house. Either of the LEDs can be replaced with a buzzer to set off an alarm whenever someone or something enters the guarded area.