Arduino RGB LED

 Arduino RGB LED 模組

模組原理

常見使用的三色LED，不是透過通訊控制，而是透過IO控制紅藍綠三個發光二極體，使燈管亮滅進行光的三原色混合進行調色。

實驗目標

透過Arduino 控制PWM輸出至RGB 模組調整色彩顏色

電路接線

RGB – 分別對應到arduino NANO 腳位

arduino NANO	RGB 模組
PIN3	R
PIN5	B
PIN6	G
GND	-

與arduino NANO接線前，需確認模組功能正常

使用電表的短路偵測檔位進行測試，模組上的"-"腳接黑色探棒，分別用紅色探棒依序，碰觸RGB腳，確認顏色是否正常，如下圖所示

綠燈測試

紅燈測試

藍燈測試

程式碼

//RGB LED

#define G_PIN 3

#define B_PIN 5

#define R_PIN 6

int G_PIN_Duty = 0;

int B_PIN_Duty = 0;

int R_PIN_Duty = 0;

void RGB_Demo(void)

{

  //Red Light On/Off

  analogWrite(R_PIN, 255);

  delay(1000);

  analogWrite(R_PIN, 0);

  delay(1000);

  //Green Light On/Off

  analogWrite(G_PIN, 255);

  delay(1000);

  analogWrite(G_PIN, 0);

  delay(1000);

  //Blue Light On/Off

  analogWrite(B_PIN, 255);

  delay(1000);

  analogWrite(B_PIN, 0);

  delay(1000);

}

void setup() {

  analogWrite(G_PIN, 0);

  analogWrite(B_PIN, 0);

  analogWrite(R_PIN, 0);

  RGB_Demo();

}

void Control_LED(int PIN, int DelayusTime, int Lightmode)

{

  if (Lightmode == true)//Off to On

  {

    for (int i = 0; i <= 255; i++)

    {

      analogWrite(PIN, i);

      delayMicroseconds(DelayusTime);

    }

  }

  else //On to Off

  {

    for (int i = 255; i >= 0; i--)

    {

      analogWrite(PIN, i);

      delayMicroseconds(DelayusTime);

    }

  }

}

void loop() {

  Control_LED(R_PIN,3000,true);

  Control_LED(G_PIN,3000,true);

  Control_LED(B_PIN,3000,true);

  delay(2000);

  Control_LED(R_PIN,3000,false);

  Control_LED(G_PIN,3000,false);

  Control_LED(B_PIN,3000,false);

  delay(2000);

  Control_LED(R_PIN,3000,true);

  Control_LED(G_PIN,3000,true);

  delay(2000);

  Control_LED(R_PIN,3000,false);

  Control_LED(G_PIN,3000,false);

  delay(2000);

  Control_LED(G_PIN,3000,true);

  Control_LED(B_PIN,3000,true);

  delay(2000);

  Control_LED(G_PIN,3000,false);

  Control_LED(B_PIN,3000,false);

  delay(2000);

  Control_LED(R_PIN,3000,true);

  Control_LED(B_PIN,3000,true);

  delay(2000);

  Control_LED(R_PIN,3000,false);

  Control_LED(B_PIN,3000,false);

  delay(2000);

}

完成效果

注意事項

1. LED 電流跟電壓注意，記得配電阻避免電流過大

2. 每家廠牌的可能不一樣，若沒有使用模組直接使用，建議串聯電阻，可避免燒毀

3. 模組使用前先使用電表確認功能

參考資料

https://www.arduino.cc/reference/en/language/functions/analog-io/analogwrite/

https://zh.wikipedia.org/wiki/%E4%B8%89%E5%8E%9F%E8%89%B2%E5%85%89%E6%A8%A1%E5%BC%8F