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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);
+ }
+