闪烁的LED指示灯无延迟不起作用

如何解决闪烁的LED指示灯无延迟不起作用

我的arduino项目有问题。它应该有两种模式：正常和危险。两者之间的切换是通过Visual Studio形式进行的。正常模式下的闪烁指示灯工作正常，但是当我尝试切换到危险模式时，它们的闪烁非常暗。在危险模式下，红色，黄色和蓝色的指示灯必须同时闪烁。我的代码做到了，只有红色的LED才能正常工作。我猜这与我在正常模式下使用其他两个有关。

void loop() {

  unsigned long currentMillisYellow = millis();
  unsigned long currentMillisBlue = millis();
  unsigned long currentMillisRed = millis();
  unsigned long currentMillisGreen = millis();

  int steerAngle = map(analogRead(Potentiometer),1024,-100,100);




  //..........................................................normal state blinking


  if (rightCounter > 0 && steerAngle > 0 && state == NormalState) {
    if (currentMillisBlue - previousMillisBlue > blinkIntervalBlue) {
      previousMillisBlue = currentMillisBlue;

      ledBlueState = !ledBlueState;
      digitalWrite(ledBlue,ledBlueState);
    }
  } else {
    rightCounter = 0;
    digitalWrite(ledBlue,LOW);
  }



  if (leftCounter > 0 && steerAngle < 0 && state == NormalState) {
    if (currentMillisYellow - previousMillisYellow > blinkIntervalYellow) {
      previousMillisYellow = currentMillisYellow;

      ledYellowState = !ledYellowState;
      digitalWrite(ledYellow,ledYellowState);
    }
  } else {
    leftCounter = 0;
    digitalWrite(ledYellow,LOW);
  }


  //..........................................................hazard state blinking


  if (state == HazardState) {                                                     //why is the led brightness so low? (needs to be fixed)
    if (currentMillisYellow - previousMillisYellow > blinkIntervalYellow) {
      previousMillisYellow = currentMillisYellow;

      ledYellowState = !ledYellowState;
      digitalWrite(ledYellow,ledYellowState);
    }
  }


  if (state == HazardState) {
    if (currentMillisBlue - previousMillisBlue > blinkIntervalBlue) {
      previousMillisBlue = currentMillisBlue;

      ledBlueState = !ledBlueState;
      digitalWrite(ledBlue,ledBlueState);
    }
  }


  if (state == HazardState) {
    if (currentMillisRed - previousMillisRed > blinkIntervalRed) {
      previousMillisRed = currentMillisRed;

      ledRedState = !ledRedState;
      digitalWrite(ledRed,ledRedState);
    }
  }

解决方法

blinkIntervals是否足够长以产生足够的延迟，以便可以正确地看到LED指示灯闪烁？据我了解，您正在尝试闪烁，即先将它们打开然后关闭一小段时间。在这种情况下，您可能更喜欢定义ON和OFF间隔，如this教程的第二个示例代码中所做的那样。

另外，如@Juraj所说，您的else块正在将它们关闭，这可能就是您看到昏暗的灯光的原因。

我将定义状态，而不是在if条件中比较状态。像这样：

typedef enum {
    NORMAL,HAZARD
} Modes;

Modes state = NORMAL;

然后，在您的主循环中：

if( state == NORMAL){

// execute LEDs blinking

} else if(state == HAZARD){

// execute LEDs blinking

}