RGB LED colorful jump
Experimental phenomena
Use UNO to drive a RGB three-color LED to produce seven-color light changes. The
longest pin is the anode of the common anode, and the remaining three are red, green, and blue.
Theoretical study
Red + Green = Yellow
Green + Blue = Cyan
Red + Blue = Purple
Red + Green + Blue = White
Schematic diagram
Code writing
#define led_r 2
#define led_g 3
#define led_b 4
//枚举类型，定义了一串类型
enum {
color_r,color_g,color_b,color_rg,color_rb,color_gb,color_rgb};
//红 绿 蓝 黄 紫 青 白
void setup() {
//设置输出
pinMode(led_r, OUTPUT);
pinMode(led_g, OUTPUT);
pinMode(led_b, OUTPUT);
}
void loop() {
unsigned int i;
for (i = 0; i < 7; i++) {
change_color(i);
delay(1000);
}
}
//选择颜色的函数
void change_color(unsigned char data_color) {
switch (data_color)
{
//红色
case color_r: {
digitalWrite(led_r, LOW);
digitalWrite(led_g, HIGH);
digitalWrite(led_b, HIGH);
break;
}
//绿色
case color_g:
{
digitalWrite(led_r, HIGH);
digitalWrite(led_g, LOW);
digitalWrite(led_b, HIGH);
break;
}
//蓝色
case color_b:
{
digitalWrite(led_r, HIGH);
digitalWrite(led_g, HIGH);
digitalWrite(led_b, LOW);
break;
}
//紫色
case color_rb:
{
digitalWrite(led_r, LOW);
digitalWrite(led_g, HIGH);
digitalWrite(led_b, LOW);
break;
}
//黄色
case color_rg:
{
digitalWrite(led_r, LOW);
digitalWrite(led_g, LOW);
digitalWrite(led_b, HIGH);
break;
}
//青色
case color_gb:
{
digitalWrite(led_r, HIGH);
digitalWrite(led_g, LOW);
digitalWrite(led_b, LOW);
break;
}
//白色
case color_rgb:
{
digitalWrite(led_r, LOW);
digitalWrite(led_g, LOW);
digitalWrite(led_b, LOW);
break;
}
default: {
break;
}
}
}