七色灯控制系统

开发原理

七彩循环主要是依靠光的叠加原理,利用光的三基色组合成其他的颜色,实现七彩循环:
红、
绿、
红+绿=黄、
蓝、
红+绿=紫、
绿+蓝=青、
红+蓝+绿=白。

实验代码

#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
      }
    }
  }
}