Block Diagram The security system comprises of an Arduino Uno microcontroller and ... (3,4); // RX and TX pins to communicate with GSM module #define msg_key 7 #define call_key 8 #define end_key 9 ...

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 ...