Question

我正在尝试创建一个程序，该程序将从给定数组中随机选择RGB LED的PWM值。它与第一种颜色蓝色一起工作正常。然后我用第二种颜色筑巢，绿色，我从显示中松开蓝色，只显示绿色。

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

  int x[9] = {0, 32, 64, 96, 128, 160, 192, 224, 256};  //setup Array X for brightness options
  int blueVariable = 0;                                 //Blue LED
  int greenVariable = 0;                                //Green LED
  for (int blueLed = 0; blueLed > -1; ) {               //for loop to choose PWM option
    analogWrite(11, x[blueVariable]);                   //Initilize the PWM function on pin 11 to brightness of blueVariable
  //  if (blueLed == 255) blueLed = 0;                    //
    blueVariable = random(0,8);                         //Random function to decide on blueVariable value
  delay(500);


     for (int greenLed = 0; greenLed > -1; ) {
       analogWrite(10, x[greenVariable]);
      //  if (g == 255) g = 0;             // switch direction at peak
        greenVariable = random(0,255);
     delay(500);
     }
  }

}

Answer 1

你有两个问题：

首先，你勾勒出你的＆＃34; for循环＆＃34;对于（！）中的绿色，蓝色的for循环。基于循环运行无限的事实，你只能循环遍历第二个for循环。

第二个问题（也许不是问题，但是你没有看到蓝色的原因）是你将blueVariable初始化为0。如果是第一次运行，则将值0写入PWM引脚。之后你改变了变量，但是没有写入PWM引脚，因为你陷入了无限的绿色循环＆＃34;。

顺便说一句，就像迈克尔的评论中所说，你应该将255更改为8并且在数组中你应该将最后一个值（256）更改为255，因为8位PWM意味着从0到255的256个值。

示例：

int x[9] = {0, 32, 64, 96, 128, 160, 192, 224, 255};    // Changed Value

void loop() {
  int blueVariable = 0;                                 //Blue LED
  int greenVariable = 0;                                //Green LED

  while(1) {                                            // Because it was infinite already i changed it to while(1)
    blueVariable = random(0,8);                         //Put in front of analogWrite()
    analogWrite(11, x[blueVariable]);                   
    delay(500);

    // Deleted the scond loop
    greenVariable = random(0,8);                        // Value changed from 255 to 8; Also put in front of analogWrite
    analogWrite(10, x[greenVariable]);
    delay(500);
  }        
}

Arduino RGB LED随机PWM电平

1 个答案: