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 ...

I have used D4, D5, D6 & D7 pins to control the 4-channel relay module. As per the source code, when the control pins of the relay module receive the LOW signal the respective relay will turn on and ...

In circuit, IR sensor Module output pin is simple connected to the Pin 2 no of Arduino and Relay Module’s input is connected to Pin 7 no of Arduino. Further a DC Motor is connected to the Relay. To ...

Download "sms_call_gate.ino" Sketch from the repository and Upload it to Arduino. NOTE : Make sure to replace your number in code at line number 71. The number must be in international format. After ...