This is the first installment of what I hope will be a complete and easy to understand series of tutorials on remote control using Arduino, Bluetooth, and free software that allows you to control just about any electrical device from an LED all the way to 110 volt AC lamps, fans, etc.
A word of warning: WARNING 110 volts of alternating current can kill, maim, and otherwise ruin your day so if you're not comfortable working with mains (110VAC in the USA) voltage please use this circuit to remotely turn on and off an LED instead. It is possible you could safely wire up the 110 volt AC circuit and then forget the circuit is live with powerful and deadly voltage and grab a bare wire thinking it is turned off when actually it is not. So be warned. Should you get hurt I am not responsible - You are!
Ok now that is out of the way, let's get started.
To build this project in its most basic version you will need:
Arduino Uno/Nano/Pro-Mini just to name a few
Relay Module - ebay search
Bread Board - ebay search
5 volt direct current source - I used a converted computer ATX power supply
Jumper wires - I use Dupont type - ebay search
3.3V - 5V Logic Level Bi-Directional Shifter Module - ebay search
3.3 volt direct current source - Again I used a converted computer ATX power supply