目录

一、参考

二、目标

驱动一颗RGB三基色LED产生七色光的变化

引脚最长的为共阳的正极，剩下3个分别为红色、绿色、蓝色。

三、理论学习

四、实物图

淘宝链接：

五、代码

7色光切换

// 定义三基色
#define LED_R 3
#define LED_G 5
#define LED_B 6

int PWMValue = 0;

void setup()
{
	// 初始化三个颜色都是不亮，都是低电平
	analogWrite(LED_R, 255);
	analogWrite(LED_G, 255);
	analogWrite(LED_B, 255);
}

void loop()
{
	int i = 0;
	// 红色逐渐变亮
	PWMValue = 255;
	for(i = 0; i < 255; i++)
	{
		analogWrite(LED_R, PWMValue--);
		analogWrite(LED_G, 255);
		analogWrite(LED_B, 255);
		delay(10);
	}
	// 红色逐渐变暗
	PWMValue = 0;
	for(i = 0; i < 255; i++)
	{
		analogWrite(LED_R, PWMValue++);
		analogWrite(LED_G, 255);
		analogWrite(LED_B, 255);
		delay(10);
	}
	// 绿色逐渐变亮
	PWMValue = 255;
	for(i = 0; i < 255; i++)
	{
		analogWrite(LED_R, 255);
		analogWrite(LED_G, PWMValue--);
		analogWrite(LED_B, 255);
		delay(10);
	}
	// 绿色逐渐变暗
	PWMValue = 0;
	for(i = 0; i < 255; i++)
	{
		analogWrite(LED_R, 255);
		analogWrite(LED_G, PWMValue++);
		analogWrite(LED_B, 255);
		delay(10);
	}
}

颜色渐变

参考：

需要把三根线接到板子带波浪线的引脚，比如3，5，6 颜色值是从0~255

#define LED_R 3
#define LED_G 5
#define LED_B 6

int PWMValue = 0;

void setup()
{
	// 初始化三个颜色都是不亮，都是低电平
	analogWrite(LED_R, 255);
	analogWrite(LED_G, 255);
	analogWrite(LED_B, 255);
}

void loop()
{
	int i = 0;
	// 红色逐渐变亮
	PWMValue = 255;
	for(i = 0; i < 255; i++)
	{
		analogWrite(LED_R, PWMValue--);
		analogWrite(LED_G, 255);
		analogWrite(LED_B, 255);
		delay(10);
	}
	// 红色逐渐变暗
	PWMValue = 0;
	for(i = 0; i < 255; i++)
	{
		analogWrite(LED_R, PWMValue++);
		analogWrite(LED_G, 255);
		analogWrite(LED_B, 255);
		delay(10);
	}
	// 绿色逐渐变亮
	PWMValue = 255;
	for(i = 0; i < 255; i++)
	{
		analogWrite(LED_R, 255);
		analogWrite(LED_G, PWMValue--);
		analogWrite(LED_B, 255);
		delay(10);
	}
	// 绿色逐渐变暗
	PWMValue = 0;
	for(i = 0; i < 255; i++)
	{
		analogWrite(LED_R, 255);
		analogWrite(LED_G, PWMValue++);
		analogWrite(LED_B, 255);
		delay(10);
	}
}