Start by looking at the examples in the IDE. They will show you how to read the state of a pin (either analogue or digital) and drive an LED pin HIGH or LOW.
Write out the logic of your program in pseudo code before writing it for real.
Start by looking at the examples in the IDE. They will show you how to read the state of a pin (either analogue or digital) and drive an LED pin HIGH or LOW.
Write out the logic of your program in pseudo code before writing it for real.