Arduino : 函式 loop()

Ref: http://arduino.cc/en/Reference/Setup

loop()

在 setup() 程式被執行後, 此程式會重複不停地被呼叫執行. 直到主板關閉電源為止. 

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);
}