Question

此程序用于计算按钮1按下的次数，然后按下按钮2按钮退出循环。 button2就像一个回车键。

如果我在没有do的情况下单独执行do while语句内部的操作，那么它会计算每个按钮的推送次数。我用它来验证我是否正确构建了电路。但由于某些未知原因，如果我将相同的代码放入do或者只是一段时间，那么它就不会读取引脚。它将在do while内循环，但最后不会退出到done语句。如果我在按下两个按钮中的任何一个时启动arduino，那么它将注册一个按钮被按下，但是一旦我放手，它就会再次执行任何操作。请告诉我我做错了什么。

我的代码

int ledpin = 11;
int button1pin = 7;
int button2pin = 2;
int button1counter = 0;
int button1state = 0;
int lastButton1state = 0;
int button2state = 0;
int lastButton2state = 0;
int button2counter = 0;

void setup() {                
  // initialize the digital pin as an output.
  pinMode(button1pin, INPUT);
  pinMode(button2pin, INPUT);
  Serial.begin(9600);  
}

void loop() {
  button1state = digitalRead(button1pin);
  button2state = digitalRead(button2pin);
   do  {   
    if (button1state != lastButton1state) {
     if (button1state == HIGH) {
       button1counter++;
       Serial.print("number of button 1 pushes: ");
       Serial.println(button1counter);
       }
       lastButton1state = button1state;
     }
   } while(button2state == LOW);



  Serial.println("done");


}

谢谢我改变了它，当然也是你的权利。但是，我不太明白为什么你的权利。让我用我的理解对代码进行评论，如果我错了，请纠正我。

void setup() {                

  pinMode(button1pin, INPUT);//tells comp to make button 1 input
  pinMode(button2pin, INPUT);//tells comp to make button 2 input
  Serial.begin(9600);  
}

void loop() {
  button1state = digitalRead(button1pin);//tells comp to begin reading pin?  but for how long?
  button2state = digitalRead(button2pin);
   do  {

Answer 1

你在while循环之外读取你的按钮状态，所以你的button1state和button2state永远不会更新，这就是为什么你进入一个无限循环只需做一点改变：

void loop() {
    do  {
        button1state = digitalRead(button1pin);
        button2state = digitalRead(button2pin);

        if (button1state != lastButton1state) {
            if (button1state == HIGH) {
               button1counter++;
               Serial.print("number of button 1 pushes: ");
               Serial.println(button1counter);
            }
            lastButton1state = button1state;
        }
   } while(button2state == LOW);

  Serial.println("done");


}

Arduino不会读取按钮

1 个答案: