Technical requirements
There are several examples in this chapter that show how to use different hardware. Besides your Arduino Uno and your PC, you will need at least a solderless breadboard, an LED, a 220-Ohm resistor, a potentiometer, and a few jumper wires. To follow the more advanced examples, you will also need either three NPN bipolar transistors or three N-channel MOSFETs, a multicolor (RGB) LED strip, and a character Liquid-Crystal Display (LCD). For the sound examples, all you need is a piezo buzzer.