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loop()

在setup()函数中初始化和定义了变量之后,loop()函数,顾名思义,不停的循环，根据程序中的内容,根据一些反馈,响应改变执行情况。我们就用loop中的代码控制Arduino板。

Example

 
int buttonPin = 3;

// setup中初始化串口和按键针脚. 
void setup()
{
  beginSerial(9600);
  pinMode(buttonPin, INPUT);
}

// loop中每次都检查按钮,如果按钮被按下,就发送信息到串口

void loop()
{
  if (digitalRead(buttonPin) == HIGH)
    serialWrite('H');
  else
    serialWrite('L');

  delay(1000);
}

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