5. New Components
This example demonstrates the use of a pushbutton as a switch: each time you press the button,
the LED (or whatever) is turned on (if it's off) or off (if on). It also debounces the input, without
which pressing the button once would appear to the code as multiple presses.
The LiquidCrystal library allows you to control LCD displays that are compatible with the
Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the
16-pin interface.
A potentiometer is a simple knob that provides a variable resistance, which we can read into the
Arduino board as an analog value. In this example, that value controls the rate at which an LED
blinks.
