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+.. _arduino-loop:
+
+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
+~~~~~~~
+
+::
+
+     
+    int buttonPin = 3;
+    
+    // setup initializes serial and the button pin
+    void setup()
+    {
+      beginSerial(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)
+        serialWrite('H');
+      else
+        serialWrite('L');
+    
+      delay(1000);
+    }
+