SIM800L is the smallest GSM(Global System for Mobile communication) module in the world. This module uses UART (Universal Asynchronous Receiver / Transmitter) as communication protocol to exchange ...
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 ...
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