This project uses GSM Module (SIM900) with Arduino to switch Relay state by SMS OR CALL. Step 1 (Connect SIM900 With Arduino) Use picture as a reference for connecting SIM900 to Arduino.

The relay module will need 5V from Arduino to power up and will get input from four different digital pins of the Arduino. Now let’s connect the relay module to your home appliance. Take the positive ...

This project contains Arduino code for an ESP32 microcontroller to control a relay module, which in turn controls lights, to create a variety of blinking patterns. The code is designed to demonstrate ...

Tip: learn how to power light bulbs using Arduino with a relay module. What You’ll Need. If you’re ready to get started, you’ll need these items to get this project off the ground. Hardware. HW-479 ...