Introduction. Physical computing refers to the process of building physical interfaces that respond to the analog world.
Using a Microcontroller. A microcontroller is a small computer that can take in information from inputs such as sensors and switches and control outputs such as lights, motors and other computers.
Building a circuit. A circuit includes all of the electronic components required for a task as well as wires or another material which will let the electricity flow between the connected components.
Digital Input and Output. On the Arduino, a digital input might be a switch or button, the output an LED.
Analog Input and Output. Analog information can hold a range of possible values.
