It is very easy to build an “SMS-controlled relay” with the help of a cheap GSM modem module and a small microcontroller board. Here, I’m using the SIM800L and Arduino Nano V3 to develop a nifty ...

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

Hobbyists, electronic enthusiasts and makers may be interested in a new 4 channel relay board aptly named ... that is all programmed using the classic Arduino IDE. As it’s all Wi-Fi connected ...