Block Diagram. The security system comprises of an Arduino Uno microcontroller and a standard SIM900A based GSM/GPRS modem. The whole system can be powered from any 12VDC/2A power supply unit/battery.

Abstract: System based on CORTEX M3 core board and high performance industrial GSM/GPRS module SIM900A as the core of design, design a kind of automatic SMS alarm smoke gas detection system. The core ...