Physical Computing

Physical computing sits between hardware and software: reading the world with sensors and acting on it with light, sound and motion.

The loop

• Sense — buttons, potentiometers, light and distance sensors
• Think — read state on a microcontroller
• Act — drive LEDs, motors and speakers

const int BUTTON = 2;
const int LED = 13;

void setup() {
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
}

void loop() {
  digitalWrite(LED, digitalRead(BUTTON) == LOW);
}