====== boolean   ======

A **boolean** holds one of two values, [[arduino:variable scope and qualifiers:Constants|true]] or [[arduino:variable scope and qualifiers:Constants|false]].  (Each boolean variable occupies one byte of memory.)

==== Example   ====
<code arduino>
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);
  digitalWrite(switchPin, HIGH);      // turn on pullup resistor
}

void loop()
{
  if (digitalRead(switchPin) == LOW)
  {  // switch is pressed - pullup keeps pin high normally
    delay(100);                        // delay to debounce switch
    running = !running;                // toggle running variable
    digitalWrite(LEDpin, running)      // indicate via LED
  }
}



</code>

==== See also   ====
* [[arduino:variable scope and qualifiers:Constants]]
* [[arduino:boolean operators:Boolean | boolean operators]]
* [[arduino:variable scope and qualifiers:VariableDeclaration|Variable Declaration]]
Source: arduino.cc