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我正在尝试找到一种方法来使用一个按钮来启用/禁用命令。（实际上，这是一个多色 LED，我正在尝试开始/停止更改颜色）

我的代码在这里，但它不起作用，如果有人能告诉我出了什么问题，我看不到它......

int red = 0;
int redPin = 9;
int blue = 0;
int bluePin = 11;
int green = 0;
int greenPin = 10;
int state = 0;
int stateModulo = 0;
void setup() {
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(2, INPUT);
}


void checkButton(int var, int result) {
  if (digitalRead(2) == HIGH) {
      var++;
      result = var%2;
    }
}

void changecolor(int startColor,int endColor,int startPin,int endPin,int delayTime)
{
  for (endColor = 0; endColor <= 255; endColor++)
  {
     checkButton(state,stateModulo);
     if (stateModulo == 0) {
       startColor = 255 - endColor;
       analogWrite(endPin, endColor);
       analogWrite(startPin, startColor);
       delay(delayTime);
     }
  }
}

void loop() {
   changecolor(red,green,redPin,greenPin,10);
   changecolor(green,blue,greenPin,bluePin,10);
   changecolor(blue,red,bluePin,redPin,10);
 }
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2 回答 2

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在下面的代码中，result不通过引用传递，也不返回。这同样适用于var，在您修改它之后，您会丢弃您所做的任何编辑。

void checkButton(int var, int result) {
  if (digitalRead(2) == HIGH) {
      var++;
      result = var%2;
    }
}

我可以向您推荐一本很好的 C++ 书籍，可以在其中学习一些语言基础知识。我的建议：Thinking in C++，作者 Bruce Eckel。

于 2012-05-22T17:34:54.857 回答
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考虑一下：

//Buttons

int button1 = 7;
int button2 = 6;
int button3 = 4;
int button4 = 2;


//Relays
int rl1 = 13;
int rl2 = 12;
int rl3 = 11;
int rl4 = 8;


//States for Relay and Button (1)

int state1 = HIGH;      // the current state of the output pin
int reading1;           // the current reading from the input pin
int previous1 = LOW;    // the previous reading from the input pin

//States for Relay and Button (2)

int state2 = HIGH;      // the current state of the output pin
int reading2;           // the current reading from the input pin
int previous2 = LOW;    // the previous reading from the input pin

//States for Relay and Button (3)

int state3 = HIGH;      // the current state of the output pin
int reading3;           // the current reading from the input pin
int previous3 = LOW;    // the previous reading from the input pin

//States for Relay and Button (4)

int state4 = HIGH;      // the current state of the output pin
int reading4;           // the current reading from the input pin
int previous4 = LOW;    // the previous reading from the input pin




// the follow variables are long's because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long time1 = 0;          // the last time the output pin was toggled
long time2 = 0;
long time3 = 0;
long time4 = 0;

long debounce1 = 200;   // the debounce time, increase if the output flickers
long debounce2 = 200;
long debounce3 = 200;
long debounce4 = 200;


void setup()
{
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(button3, INPUT);
  pinMode(button4, INPUT);

  pinMode(rl1, OUTPUT);
  pinMode(rl2, OUTPUT);
  pinMode(rl3, OUTPUT);
  pinMode(rl4, OUTPUT);

}

void loop() {

  reading1 = digitalRead(button1);
  reading2 = digitalRead(button2);
  reading3 = digitalRead(button3);
  reading4 = digitalRead(button4);


  // if the input just went from LOW and HIGH and we've waited long enough
  // to ignore any noise on the circuit, toggle the output pin and remember
  // the time
  //Condition Relay 1
  if (reading1 == HIGH && previous1 == LOW && millis() - time1 > debounce1) {
    if (state1 == HIGH)
      state1 = LOW;
    else
      state1 = HIGH;

    time1 = millis();    
  }

  //Condition Relay 2
    if (reading2 == HIGH && previous2 == LOW && millis() - time2 > debounce2) {
    if (state2 == HIGH)
      state2 = LOW;
    else
      state2 = HIGH;

    time2 = millis();    
  }

  //Condition Relay 3
    if (reading3 == HIGH && previous3 == LOW && millis() - time3 > debounce3) {
    if (state3 == HIGH)
      state3 = LOW;
    else
      state3 = HIGH;

    time3 = millis();    
  }

  //Condition Relay 4
    if (reading4 == HIGH && previous4 == LOW && millis() - time4 > debounce4) {
    if (state4 == HIGH)
      state4 = LOW;
    else
      state4 = HIGH;

    time4 = millis();    
  }




  digitalWrite(rl1, state1);
  digitalWrite(rl2, state2);
  digitalWrite(rl3, state3);
  digitalWrite(rl4, state4);


  previous1 = reading1;
  previous2 = reading2;
  previous3 = reading3;
  previous4 = reading4;
}
于 2016-09-16T02:33:06.307 回答