Arduino RGB LED 随机 PWM 电平

Question

我正在尝试创建一个程序，该程序将从给定阵列中随机选择 RGB LED 的 PWM 值。它适用于第一种颜色，蓝色。然后我嵌套在第二种颜色绿色中，我从显示中去掉蓝色，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，您将 "for loop" 的绿色挂钩在（！）蓝色的 for 循环中。基于循环运行宁无限的事实，你只循环第二个 for 循环。

第二个问题（也许不是问题，但是您看不到蓝色的原因）是您将 blueVariable 初始化为 0。如果你第一次运行，你将值 0 写入 PWM 引脚。之后你更改变量，但不要写入 PWM 引脚，因为你会卡在你的 "infinite green Loop".

顺便说一句，就像 Michael 在评论中所说的那样，您应该将 255 更改为 8，并且在您的数组中您应该将最后一个值 (256) 更改为 255，因为 8 位 PWM 意味着 0-255 之间的 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

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