基于arduino的红绿灯程序，包含原理图

【实例简介】基于arduino平台，用c语言设计的红绿灯程序，工程文件格式是ino，直接用arduino ide打开就可以用的

压缩包包含工程代码和原理图

【实例截图】

【核心代码】

#define GREEN_TIME 10
#define YELLOW_TIME 3
#define URGENCY_TIME 20
const int DongIn   = A0;  // Analog input pin that the potentiometer is attached to
const int BeiIn   = A1;  // Analog input pin that the potentiometer is attached to
const int XiIn    = A2;  // Analog input pin that the potentiometer is attached to
const int NanIn   = A3;  // Analog input pin that the potentiometer is attached to

const int DongGreen = 2;  // Analog input pin that the potentiometer is attached to
const int DongYellow = 3;  // Analog input pin that the potentiometer is attached to
const int DongRed = 4;  // Analog input pin that the potentiometer is attached to

const int BeiGreen = 5;  // Analog input pin that the potentiometer is attached to
const int BeiYellow = 6;  // Analog input pin that the potentiometer is attached to
const int BeiRed = 7;  // Analog input pin that the potentiometer is attached to

const int XiGreen = 8;  // Analog input pin that the potentiometer is attached to
const int XiYellow = 9;  // Analog input pin that the potentiometer is attached to
const int XiRed = 10;  // Analog input pin that the potentiometer is attached to

const int NanGreen = 11;  // Analog input pin that the potentiometer is attached to
const int NanYellow = 12;  // Analog input pin that the potentiometer is attached to
const int NanRed = 13;  // Analog input pin that the potentiometer is attached to

#define STA_OFF HIGH
#define STA_ON LOW
#define DIFFERNCE 30


int AdcValue[4]= {0};        // value read from the pot

int alarm_status=0;
int led_time=0,led_count=0;
int alarm_time=0,alarm_count=0,alarm_delay=0;
int Counter=0;
int i=0;
void setup() {
  // initialize serial communications at 9600 bps:
  for(i=2;i<14;i )
  {
    pinMode(i, OUTPUT);
    LedSwitch(i,STA_OFF);
  }
  Serial.begin(9600);

}

void loop() {
  int id=0,max_value=0;
  AdcValue[0]=   analogRead(DongIn);
  AdcValue[1]=    analogRead(BeiIn);
  AdcValue[2]=     analogRead(XiIn);
  AdcValue[3]=    analogRead(NanIn);
  #if 1
  Serial.print(AdcValue[0]);
  Serial.print(' ');
  Serial.print(AdcValue[1]);
  Serial.print(' ');
  Serial.print(AdcValue[2]);
  Serial.print(' ');
  Serial.println(AdcValue[3]);
  #endif
  #if 1
  id=GetMax(AdcValue[0],AdcValue[1],AdcValue[2],AdcValue[3]);
  max_value=AdcValue[id-1];
  AdcValue[id-1]=0;//将最大变为0,求然后再求最大值，求出来的最大值就是第二大的数，
  id=GetMax(AdcValue[0],AdcValue[1],AdcValue[2],AdcValue[3]);
  if(max_value>(AdcValue[id-1] DIFFERNCE))//对比最大的数和第二大的数，如果差值大于DIFFERNCE，代表有警报声，进入紧急状态
  {
    if(alarm_count==0)
    {
      alarm_status=1;
      alarm_count=URGENCY_TIME*10;
      alarm_time=URGENCY_TIME*10; 
      //Serial.println("urgency on");     
    }
  }
  else
  {
    if(alarm_count)
    {
      alarm_count--;
      if(alarm_count==0)
      {
        alarm_status=0;
        //Serial.println("urgency off");
      }
    }
  }
#endif
  Led_Process();
  delay(100);
}
int GetMax(int a,int b,int c,int d)
{
  int temp=1,m=0;
  m=a;
  if(b>m)
  {
    m=b;
    temp=2;
  }
  if(c>m)
  {
    m=c;
    temp=3;
  }
  if(d>m)
  {
    m=d;
    temp=4;
  }
  return temp;
}
void Led_Process(void)//100ms调用一次
{
  if(alarm_status==0)
  {
    if( led_count>led_time)
    {
      //Serial.println("alarm=0");
      led_count=0;
      //Counter=1;
      switch(Counter)
      {
        case 0:
          LedSwitch(XiRed,STA_ON);     LedSwitch(BeiRed,STA_ON);
          LedSwitch(NanGreen,STA_OFF);  LedSwitch(NanYellow,STA_OFF);   LedSwitch(NanRed,STA_ON);
          LedSwitch(DongGreen,STA_ON);  LedSwitch(DongYellow,STA_OFF);  LedSwitch(DongRed,STA_OFF);
          led_time=GREEN_TIME*10;
          Counter ;
          break;
        case 1:
          LedSwitch(DongGreen,STA_OFF); LedSwitch(DongYellow,STA_ON);   LedSwitch(DongRed,STA_OFF);
          led_time=YELLOW_TIME*10;
          Counter ;
          break;
        case 2:
          LedSwitch(DongGreen,STA_OFF); LedSwitch(DongYellow,STA_OFF);  LedSwitch(DongRed,STA_ON);
          LedSwitch(BeiGreen,STA_ON);   LedSwitch(BeiYellow,STA_OFF);   LedSwitch(BeiRed,STA_OFF);
          led_time=GREEN_TIME*10;
          Counter ;
          break;
        case 3:
          LedSwitch(BeiGreen,STA_OFF);  LedSwitch(BeiYellow,STA_ON);   LedSwitch(BeiRed,STA_OFF);
          led_time=YELLOW_TIME*10;
          Counter ;
          break;
        case 4:
          LedSwitch(BeiGreen,STA_OFF);  LedSwitch(BeiYellow,STA_OFF);  LedSwitch(BeiRed,STA_ON);
          LedSwitch(XiGreen,STA_ON);    LedSwitch(XiYellow,STA_OFF);    LedSwitch(XiRed,STA_OFF);
          led_time=GREEN_TIME*10;
          Counter ;
          break;
        case 5:
          LedSwitch(XiGreen,STA_OFF);   LedSwitch(XiYellow,STA_ON);   LedSwitch(XiRed,STA_OFF);
          led_time=YELLOW_TIME*10;
          Counter ;
          break;
        case 6:
          LedSwitch(XiGreen,STA_OFF);   LedSwitch(XiYellow,STA_OFF);  LedSwitch(XiRed,STA_ON);
          LedSwitch(NanGreen,STA_ON);   LedSwitch(NanYellow,STA_OFF);  LedSwitch(NanRed,STA_OFF);
          led_time=GREEN_TIME*10;
          Counter ;
          break;
       case 7:
          LedSwitch(NanGreen,STA_OFF);  LedSwitch(NanYellow,STA_ON);   LedSwitch(NanRed,STA_OFF);
          led_time=YELLOW_TIME*10;
          Counter=0;
          break;      
      }
    }
  }
  else
  {//紧急模式
    //if( alarm_count>alarm_time)
    {
      //Serial.println("alarm=1");
      
      LedSwitch(DongGreen,STA_OFF);  LedSwitch(DongYellow,STA_OFF);  LedSwitch(DongRed,STA_ON);
      LedSwitch(BeiGreen,STA_OFF);  LedSwitch(BeiYellow,STA_OFF);  LedSwitch(BeiRed,STA_ON);
      LedSwitch(XiGreen,STA_OFF);    LedSwitch(XiYellow,STA_OFF);    LedSwitch(XiRed,STA_ON);
      LedSwitch(NanGreen,STA_OFF);  LedSwitch(NanYellow,STA_OFF);   LedSwitch(NanRed,STA_ON);
      
      Counter=0;
      led_count=0;
      led_time=0;      
    }
  }
}
void LedSwitch(int id,int sta)
{
  digitalWrite(id, sta);
}