基于Arduino的RGB灯按键控制

一.简介

通过按键控制RGB灯分别显示7种颜色：红 、绿、 蓝、 黄、 青、 紫、 白。

二.按键控制RGB灯原理

1)RGB全彩LED:

LED由三个颜色分别为：红（Red）、绿（Green）、蓝（Blue）的LED组成，通过调整3个LED的亮度，就可以产生不同的颜色。

2)三种基色组合成七色光：

黄色：红色+绿色
青色：绿色+蓝色
紫色：红色+蓝色
白色：红色+绿色+蓝色

三.源代码

#define redLED 7
#define greenLED 8
#define blueLED 9
#define KEY 2
//枚举定义7种颜色：红 绿 蓝 黄 青 紫 白
enum{redColor,greenColor,blueColor,yellowColor,qingColor,purpleColor,whiteColor};
unsigned int num = 0;
void setup() {
  // put your setup code here, to run once:
  pinMode(KEY,INPUT_PULLUP);//设置输入上拉模式
  
  pinMode(redLED,OUTPUT);
  pinMode(greenLED,OUTPUT);
  pinMode(blueLED,OUTPUT);
  digitalWrite(redLED,LOW);
  digitalWrite(greenLED,LOW);
  digitalWrite(blueLED,LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(isKeyPress())
  {
    if(num == 7)
      num = 0;
    switch(num)
    {
      case redColor:
        redBright();
        break;
      case greenColor:
        greenBright();
        break;
      case blueColor:
        blueBright();
        break;
      case yellowColor:
        yellowBright();
        break;
      case qingColor:
        qingBright();
        break;
      case purpleColor:
        purpleBright();
        break;
      case whiteColor:
        whiteBright();
        break;
    }
    num++;
  }
}

//红色
void redBright()
{
  //高电平点亮相应的灯
  digitalWrite(redLED,HIGH);
  digitalWrite(greenLED,LOW);
  digitalWrite(blueLED,LOW);
}
//绿色
void greenBright()
{
  digitalWrite(redLED,LOW);
  digitalWrite(greenLED,HIGH);
  digitalWrite(blueLED,LOW);
}
//蓝色
void blueBright()
{
  digitalWrite(redLED,LOW);
  digitalWrite(greenLED,LOW);
  digitalWrite(blueLED,HIGH);
}
//黄色
void yellowBright()
{
  digitalWrite(redLED,HIGH);
  digitalWrite(greenLED,HIGH);
  digitalWrite(blueLED,LOW);
}
//青色
void qingBright()
{
  digitalWrite(redLED,LOW);
  digitalWrite(greenLED,HIGH);
  digitalWrite(blueLED,HIGH);
}
//紫色
void purpleBright()
{
  digitalWrite(redLED,HIGH);
  digitalWrite(greenLED,LOW);
  digitalWrite(blueLED,HIGH);
}
//白色
void whiteBright()
{
  digitalWrite(redLED,HIGH);
  digitalWrite(greenLED,HIGH);
  digitalWrite(blueLED,HIGH);
}

bool isKeyPress()
{
  if(digitalRead(KEY) == LOW)
  {
    delay(20);//延迟消抖
    if(digitalRead(KEY) == LOW)
    {
      while(1)
      {
        //按键松开
        if(digitalRead(KEY) == HIGH)
          return true;
      }
    }
  }
  return false;
}

四.运行效果

通过按键可以控制7色光循环点亮。