When the button is pressed the Arduino board will put pin 2 in HIGH state, meaning 5V on pin 2 ... board and the transistor + relay. The load uses its own power supply, for instance if you use a light ...

We all know how fireworks are lit. It is simple, hold the flame of a lighter close to its wick and the gunpowder does the rest of the magic. However, in this post, I am going to explain how to do the ...