如何将LED和piezzo与arduino上的按钮相结合

Question

我想知道如何将LED和piezzo蜂鸣器组合在一个代码中。我想一按下按钮就停止音乐，同时打开一盏灯（LED）。我的代码不起作用，你能告诉我该怎么办吗？

      int buttonState = 0;
      int speakerPin = 10;
      int buttonPin= 7;
      int frequency = 500;
      int ledPin = 13;
      int length = 17; // the number of notes
      char notes[] = "gcefgcefgcefgcefga "; // a space represents a rest
      int beats[] = {2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1};
      int tempo = 250;
      void setup() {            
        pinMode(speakerPin, OUTPUT);
        pinMode(ledPin, OUTPUT);
        pinMode(buttonPin,INPUT);
      }
      void loop() {
        buttonState = digitalRead(buttonPin);
        if (buttonState==HIGH){
          digitalWrite(ledPin, HIGH);
          noTone(speakerPin);
        }else {
          char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
          char notes[] = "gcefgcefgcefgcefga ";         
          digitalWrite(ledPin, LOW);
          digitalWrite(speakerPin,HIGH);
          if (long i = 0; i < duration * 5000L; i += tone * 15) {
          }
      void playTone(int tone, int duration) {
          for (long i = 0; i < duration * 5000L; i += tone * 15) {
          if (buttonState==LOW){
          digitalWrite(speakerPin, HIGH);
          delayMicroseconds(tone);
          digitalWrite(speakerPin, LOW);
          delayMicroseconds(tone);
          } 
        }
      }
      }} 

Answer 1

您的代码不起作用的原因可能有几个。首先：你还没有定义noTone，我也没有看到playTone被实际使用，但在高级别上，你试图做的事情非常简单，这个伪代码应该会有所帮助：

 void loop() {
    buttonState = digitalRead(buttonPin);
    if buttonState==LOW
    playTone();
    digitalWrite(ledPin, LOW);
    else {break out of loop}
    //add in your pause here
    delayMicroseconds(pause);//I'm not sure why you put tone here in your code, just initialize int of 1000 or something  
}

你明白了！希望这能有所帮助！