Block Diagram The security system comprises of an Arduino Uno microcontroller and a standard SIM900A ... (3,4); // RX and TX pins to communicate with GSM module #define msg_key 7 #define call_key 8 ...

Presumably, the core phone module will have regulatory acceptance ... Of course, we’ve seen GSM and cell phone shields for Arduino before. Difficult to imagine sticking those in a dog collar ...

The Spark Electron was released a few days ago, giving anyone with the Arduino IDE the ability to send data out over a GSM network. Of course, the Electron is just a GSM module tied to a ...

Adafruit has this week made available the Arduino FONA 800 that has been designed to provide Arduino development boards with the ability to enable Arduino cellular GSM via both voice and data.

GSM, Wi-Fi, GPS. This allows anyone with an Android phone, an Arduino, and a $50 1Sheeld to prototype and develop with a full range of hardware, without investing hundreds into physical shields.