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);
}








