This voltage is used to drive the transistor that will switch ON the relay and the load ... the main power supply that drive the LOAD to the arduino and transistor circuitry! You can use this code ...

Leaving the joke aside, let me show how you can achieve this. You will need the Arduino Board, a 560Ω resistor, and LED and the code example below. We set the pinButton variable as integer 8 and we ...

This is a simple project. It uses an Android device to switch an LED driven by the Arduino. Connectivity is provided by the Bluetooth module inserted in the breadboard. But one look at the UI on ...