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arduino:data_types:booleanvariables

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arduino:data_types:booleanvariables [2013/02/15 20:45] (current)
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 +====== 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
  
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arduino/data_types/booleanvariables.txt · Last modified: 2013/02/15 20:45 (external edit)

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