Hobbyists, electronic enthusiasts and makers may be interested in a new 4 channel relay board ... Like an Arduino board, a micro USB port is used to power and connect to it for programming ...

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 ...