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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>`_
+
+