Block Diagram The security system comprises of an Arduino Uno microcontroller and a standard SIM900A based GSM/GPRS modem ... a telephone call when push button switch S2 is activated by the user (or ...

The Spark Electron was released a few days ago, giving anyone with the Arduino ... GSM module tied to a microcontroller, and you can do the same thing with a Pi, some components, and a bit of wire.