In these tutorial, we are going to implement a small system that beeps alarm/buzzer on detecting motion within its range. Almost all the materials for this project can be gotten from our store, here is the list:

- Arduino mega
- PIR sensor (x2)
- LED (x2)
- Piezo buzzer
- Dupont cables
- Prototype board
- Arduino IDE
- GSM module

We will be assuming that the PIR sensors will be placed at different locations or facing different directions. Connect the VCC of the PIR sensors to the 5volts pin of the Arduino, the out pin of the PIR sensors to pin 2 and 3 of the Arduino respectively and the GND to the GND of the Arduino. The LEDs should be connected to pins 13 and 12 of the Arduino respectively. The piezo buzzer goes into pin 10 of the Arduino. Finally, the GSM module RXD pin connected to Arduino TXD pin (GSM module not really included).

The full details and code for this post cna be found here.