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# loop()

After creating a setup() function, which initializes and sets the initial values, the loop() function does precisely what its name suggests, and loops consecutively, allowing your program to change and respond. Use it to actively control the Arduino board.

### Example

    const int buttonPin = 3;

    // setup initializes serial and the button pin
    void setup()
    {
      Serial.begin(9600);
      pinMode(buttonPin, INPUT);
    }

    // loop checks the button pin each time,
    // and will send serial if it is pressed
    void loop()
    {
      if (digitalRead(buttonPin) == HIGH)
        Serial.write('H');
      else
        Serial.write('L');

      delay(1000);
    }

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Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

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