Question

我有一段完整的旋律。如果我按下按钮，它将播放整首歌曲，但是如果我在delay之后稍作休息，则只需重置i。我如何才能使它仅在再次按下按钮后才能继续？（对于这个抱歉，我还是个新手，在此先感谢）

int buttonPin = 12;

void setup() 
{
 // put your setup code here, to run once:

   pinMode(buttonPin, INPUT);
}


void loop() 
{
 // put your main code here, to run repeatedly:

  int buttonState = digitalRead(buttonPin);

  for(int i = 0; i < sizeof(mariomelody); i++)
  {
    if(buttonState == HIGH)
    {
      tone(8, mariomelody[i], 70); 
      delay();
    }  
  }
}

Answer 1

在仍然按住按钮的同时停止循环：

int buttonPin = 12;

void setup() 
{
 // put your setup code here, to run once:

   pinMode(buttonPin, INPUT);
}


void loop() 
{
 // put your main code here, to run repeatedly:

  int buttonState = digitalRead(buttonPin);

  for(int i = 0; i < sizeof(mariomelody); i++)
  {
    if(buttonState == HIGH)
    {
      tone(8, mariomelody[i], 70); 
      delay();
    }  
    while(digitalRead(buttonPin) == HIGH)
    {
    // wait until the button is released
    }
    while(digitalRead(buttonPin) == LOW)
    {
    //wait until the button is pressed again
    }
  }
}

Answer 2

我猜您想在按下按钮时播放旋律，并在释放按钮时停止播放。

然后将是这样：

int i = 0;
void loop() 
{
    if(digitalRead(buttonPin) == HIGH)
    {
      tone(8, mariomelody[i], 70); 
      i = (i + 1) % sizeof(mariomelody);
      delay();
    }  
}

为避免将位置重置为旋律的开始，您需要i作为全局变量。

如果您希望按钮打开和关闭旋律，则需要另一个全局变量playing：

bool playing = false;
void loop()
{
    if(digitalRead(buttonPin) == HIGH)
    {
        playing = !playing;
        while (digitalRead(buttonPin) == HIGH)
             ; //wait for release
    }
    if (playing) {
        //the rest is the same
    }
}

Arduino仅在按下按钮时才继续进行for循环

2 个答案: