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Programming Arduino - bool Boolean Size 1 byte Range 0 to 1 A 'bool' holds one of two values, true or false. Each Boolean variable occupies one byte of memory. false=0 | true=1 Logical AND (&&) results in true only if both operands are true. Logical NOT (!) results true if false and false if true Logical OR (||) results in true if one of the operands is true. Declaration: // declaration of variable with type boolean and initialize it with false bool val = false ; // declaration of variable with type boolean and initialize it with true bool state = true ; Code example: int LEDpin = 5; // LED on pin 5 int switchPin = 13; // momentary switch on 13, other side connected to ground boolean running = false; void setup() { pinMode(LEDpin, OUTPUT); pinMode(switchPin, INPUT); // turn on pullup resistor digitalWrite(switchPin, HIGH); } void loop() { if (digitalRead(switchPin) == LOW) { // switch is pressed - pullup keeps pin high normally // delay to debounce switch delay(100); // toggle running variable running = !running; // indicate via LED digitalWrite(LEDpin, running) } }