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+.. _arduino-booleanvariables:
+
+boolean
+=======
+
+A **boolean** holds one of two values,
+`true <http://arduino.cc/en/Reference/Constants>`_ or
+`false <http://arduino.cc/en/Reference/Constants>`_. (Each boolean
+variable occupies one byte of memory.)
+
+
+
+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);
+ 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
+ }
+ }
+
+
+
+
+
+
+See also
+--------
+
+
+- `constants <http://arduino.cc/en/Reference/Constants>`_
+- `boolean operators <http://arduino.cc/en/Reference/Boolean>`_
+- `Variable Declaration <http://arduino.cc/en/Reference/VariableDeclaration>`_
+
+