// --------------------------------------------------------------------------------
/*

11 三色 LED 彩虹特效

[學習重點]

1. 彩虹七色的計算方法

[挑戰]

- 思考一下如何簡化程式，不需實作，因為答案明天會揭曉。


Created by Jason on 11 Aug 2022.

*/
// --------------------------------------------------------------------------------

int redPin = 11;
int greenPin = 10;
int bluePin = 9;

void setup()
{
  pinMode(redPin, OUTPUT); // 設定為輸出模式
  pinMode(bluePin, OUTPUT); // 設定為輸出模式
  pinMode(greenPin, OUTPUT); // 設定為輸出模式
}

void loop()
{
	// 紅 - 黃
	for (int fade = 0; fade <= 255; fade = fade + 5) {
		analogWrite(redPin, 255);
		analogWrite(greenPin, fade);
		analogWrite(bluePin, 0);
		delay(50);
	}
	// 黃 - 綠
	for (int fade = 0; fade <= 255; fade = fade + 5) {
		analogWrite(redPin, 255 - fade);
		analogWrite(greenPin, 255);
		analogWrite(bluePin, 0);
		delay(50);
	}
	// 綠 - 青
	for (int fade = 0; fade <= 255; fade = fade + 5) {
		analogWrite(redPin, 0);
		analogWrite(greenPin, 255);
		analogWrite(bluePin, fade);
		delay(50);
	}
	// 青 - 藍
	for (int fade = 0; fade <= 255; fade = fade + 5) {
		analogWrite(redPin, 0);
		analogWrite(greenPin, 255 - fade);
		analogWrite(bluePin, 255);
		delay(50);
	}
	// 藍 - 紫
	for (int fade = 0; fade <= 255; fade = fade + 5) {
		analogWrite(redPin, fade);
		analogWrite(greenPin, 0);
		analogWrite(bluePin, 255);
		delay(50);
	}
	// 紫 - 紅
	for (int fade = 0; fade <= 255; fade = fade + 5) {
		analogWrite(redPin, 255);
		analogWrite(greenPin, 0);
		analogWrite(bluePin, 255 - fade);
		delay(50);
	}
}