Seven-color light control system

Seven-color light control system

Development principle

The colorful cycle mainly relies on the principle of light superposition, and the three primary colors of light are combined into other colors to realize the colorful cycle:
red,
green,
red + green = yellow,
blue,
red + green = purple,
green + blue = cyan,
red +blue+green=white.

Experiment code

#define led_r 2//红色引脚
#define led_g 3//绿色引脚
#define led_b 4//蓝色引脚
#define key 5//按键引脚
#include<Wire.h>
#include<LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
void scan_key();
void change_color();
void lcd_hanshu();
unsigned char key_num = 0;
unsigned char color_value = 0;
//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);
  pinMode(key, INPUT_PULLUP);
  change_color(color_rgb);
  lcd_hanshu();
}
void loop() {
    
    
  scan_key();//按键扫描
  if (key_num == 1) {
    
    //按键执行程序
    key_num = 0;//清空标志位
    change_color(color_value);//切换颜色
    color_value++;//颜色变量进行加一操作
    if (color_value == color_rgb + 1) {
    
    
      //当颜色变量 == 7
      color_value = color_r;//颜色变量清零
    }
  }
}
void lcd_hanshu() {
    
    
  lcd.init();
  lcd.backlight();
}
//选择颜色的函数
void change_color(unsigned char data_color) {
    
    
  switch (data_color)
  {
    
    
    //红色
    case color_r: {
    
    
        lcd.init();
        digitalWrite(led_r, HIGH);
        digitalWrite(led_g, LOW);
        digitalWrite(led_b, LOW);
        lcd.print("red");
        break;
      }
    //绿色
    case color_g:
      {
    
    
        lcd.init();
        digitalWrite(led_r, LOW);
        digitalWrite(led_g, HIGH);
        digitalWrite(led_b, LOW);
        lcd.print("green");
        break;
      }
    //蓝色
    case color_b:
      {
    
    
        lcd.init();
        digitalWrite(led_r, LOW);
        digitalWrite(led_g, LOW);
        digitalWrite(led_b, HIGH);
        lcd.print("blue");
        break;
      }
    //紫色
    case color_rb:
      {
    
    
        lcd.init();
        digitalWrite(led_r, HIGH);
        digitalWrite(led_g, LOW);
        digitalWrite(led_b, HIGH);
        lcd.print("purple");
        break;
      }
    //黄色
    case color_rg:
      {
    
    
        lcd.init();
        digitalWrite(led_r, HIGH);
        digitalWrite(led_g, HIGH);
        digitalWrite(led_b, LOW);
        lcd.print("yellow");
        break;
      }
    //青色
    case color_gb:
      {
    
    
        lcd.init();
        digitalWrite(led_r, LOW);
        digitalWrite(led_g, HIGH);
        digitalWrite(led_b, HIGH);
        lcd.print("cyan");
        break;
      }
    //白色
    case color_rgb:
      {
    
    
        lcd.init();
        digitalWrite(led_r, HIGH);
        digitalWrite(led_g, HIGH);
        digitalWrite(led_b, HIGH);
        lcd.print("white");
        break;
      }
    default: {
    
    
        break;
      }
  }
}
void scan_key() {
    
    
  //按键扫描
  if (digitalRead(key) == 0) {
    
    
    //查看按键是否按下
    delay(20);//延时20ms
    if (digitalRead(key) == 0) {
    
    
      //查看按键是否按下
      key_num = 1;
      while (digitalRead(key) == 0) {
    
    
        //松手检测
      }
    }
  }
}