Question

我一直在尝试制作一个交通灯模拟器，但是在让一个 RGB 灯亮起来时遇到了麻烦（在代码中它用（颜色）Pin2 表示）。第一个灯工作正常，但左侧的 RGB 工作不正常。当光线为白色时，我成功地使其变亮，但是当我尝试将其设为黄色时，光线太暗了，我几乎看不到它。它接线正确，所以我认为代码中可能有错误。如果有人需要，这里是该项目的链接https://www.tinkercad.com/things/g0UkhvSKylW-copy-of-traffic-light-with-pedestrian-crossing

（也很抱歉代码凌乱，我还不太习惯 arduino，所以我知道代码不是很好）

int redLight = 13;
int yellowLight = 12;
int greenLight = 11;
int redLight2 = 10;
int yellowLight2 = 9;
int greenLight2 = 8;
int redPin = 7;
int bluePin = 6;
int greenPin = 5;
int redPin2 = 4;
int bluePin2 = 3;
int greenPin2 = 2;

void setup() {
  pinMode(redLight, OUTPUT);
  pinMode(yellowLight, OUTPUT);
  pinMode(greenLight, OUTPUT);
  pinMode(redLight2, OUTPUT);
  pinMode(yellowLight2, OUTPUT);
  pinMode(greenLight2, OUTPUT);
  pinMode(redPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void loop() {
  //Note: leftmost traffic light is used for refrence
  //all other lights are based on each others timing
  while(digitalRead(redLight) ==HIGH){
    redLightOn();
    break;
  }
  while(digitalRead(greenLight) == HIGH){
   //pedestrian light is white
    digitalWrite(redPin, 255);
    digitalWrite(greenPin, 255);
    digitalWrite(bluePin, 255);
    //pedestrian light is off
    digitalWrite(redLight2, HIGH);
    delay(6000);
    digitalWrite(bluePin, 0);//make sure to turn blue pin off!
    digitalWrite(redPin, 255);
    digitalWrite(greenPin, 40);
    delay(1000);
    digitalWrite(redPin, 0);
    digitalWrite(greenPin, 0);
    delay(500);
    digitalWrite(redPin, 255);
    digitalWrite(greenPin, 40);
    delay(1000);
    digitalWrite(redPin, 0);
    digitalWrite(greenPin, 0);
    delay(500);
    digitalWrite(redPin, 255);
    digitalWrite(greenPin, 40);
    delay(1000);
    digitalWrite(greenLight, LOW);
    digitalWrite(redPin, 0);
    digitalWrite(greenPin, 0);
    digitalWrite(bluePin, 0);
    digitalWrite(yellowLight, HIGH);
    //pedestrial light flashing
    digitalWrite(redPin, 255);
    digitalWrite(greenPin, 40);

  delay(5000);
    //yellow light changes to red
    digitalWrite(yellowLight, LOW);
    digitalWrite(redLight, HIGH);
  }

//Initial starting light: starts off red
  digitalWrite(redLight, HIGH);
}
//create an initial red light function
void redLightOn(){
    digitalWrite(redLight2, LOW);
    digitalWrite(greenLight2, HIGH);
    digitalWrite(redPin2, 255);
    digitalWrite(greenPin2, 255);
    digitalWrite(bluePin2, 255);
    //pedestrian light on white
    digitalWrite(redPin, 255);
    digitalWrite(greenPin, 40);
    //pedestrian light is off
    delay(6000);
    digitalWrite(bluePin2, 0);//make sure to turn blue pin off!
    digitalWrite(redPin2, 255);
    digitalWrite(greenPin2, 255);
    delay(1000);
    digitalWrite(redPin2, 0);
    digitalWrite(greenPin2, 0);
    delay(500);
    pYellow();
    delay(1000);
    digitalWrite(redPin2, 0);
    digitalWrite(greenPin2, 0);
    delay(500);
    pYellow();
    delay(1000);
    digitalWrite(greenLight, LOW);
    //digitalWrite(redPin, 0);
    //digitalWrite(greenPin, 0);
    //digitalWrite(bluePin, 0);
    digitalWrite(greenLight, LOW);

    //pedestrial light off
  
    digitalWrite(greenLight2, LOW);
    digitalWrite(yellowLight2, HIGH);
    delay(5000);
    digitalWrite(yellowLight2, LOW);
    digitalWrite(redLight, LOW);
    digitalWrite(greenLight, HIGH);
}

void pYellow(){
    digitalWrite(redPin2, 255);
    digitalWrite(greenPin2, 40);
}

Answer 1

您似乎对 digitalWrite 和 analogWrite 感到困惑。 digitalWrite 函数采用引脚编号和高电平或低电平。在 undefined 中传递整数值。我猜零整数将关闭，而任何其他值将打开。

看起来您想将引脚设置为模拟引脚，然后使用analogWrite 更新它们。使用此命令，您可以使用值 0 - 255 设置 0 - 5v 之间的任何电压电平。

另外一种检查代码或硬件的好方法是将 LED 的黄色引脚连接到 5V 电源线，然后查看它的亮度。最后，您是否有用于 LED 的单个公共下拉电阻器，或者您是否为每种颜色都有单独的电阻器？如果是这样，其中之一可能是错误的值，或者您在黄线上的某处有一个不可靠的连接。

Answer 2

我看不出你的代码有什么问题。实际上，这不是软件问题，而是物理问题。如果您测量 LED 支脚之间的电压，您可能会看到电压根据您的代码发生变化。问题是亮度是你用眼睛测量的东西。有些情况下，您从同一供应商处购买了不同颜色的 LED，但亮度似乎不同。

如果您想获得所有颜色的均匀亮度，您可以尝试从代码中使较浅的颜色变暗，或者尝试在腿上使用不同阻值的电阻器。

让 RGB LED 灯更亮？

2 个答案: