Gathering the front panel components
As this is our first project, we are going to use some basic components: a light-emitting di-
ode ( LED ), a rotary potentiometer, and a liquid-crystal display ( LCD ), all shown in the
following circuit diagram:
LCDs can been a bit tricky to work with, but SparkFun Electronics has combined a 16x2
LCD with a microcontroller so that it can use a serial interface instead of a more complic-
ated parallel one. The serial interface is simpler because it only requires one data line to the
device, whereas a parallel interface will require more wiring.