A single-channel relay is an electronic switch that can be controlled by a low-power electrical signal, such as the output from an Arduino microcontroller. By using an Arduino Uno and a single-channel ...

An Arduino Uno relay module controls high-power devices by switching electrical circuits on or off. It's commonly used for home automation, industrial automation, and controlling lights, motors, or ...

Summary: This setup and code are designed to monitor power status and use the SIM800H module to send SMS alerts in case of a power outage or restoration. The hardware connections are straightforward, ...