int carRed = 12; //设置汽车灯
int carYellow = 11;
int carGreen = 10;
int button = 9; //按钮引脚
int pedRed = 8; //设置行人灯
int pedGreen = 7;
int crossTime = 5000;//允许行人通过的时间
unsigned long changeTime;//按钮按下后的时间



void setup() {
  // put your setup code here, to run once:
  pinMode(carRed,OUTPUT);
  pinMode(carYellow,OUTPUT);
  pinMode(carGreen,OUTPUT);
  pinMode(pedRed, OUTPUT);
  pinMode(pedGreen, OUTPUT);
  pinMode(button, INPUT);
  digitalWrite(carGreen, HIGH);
  digitalWrite(pedRed, HIGH);


}

void changeLights(){
  digitalWrite(carGreen, LOW);
  digitalWrite(carYellow,HIGH);
  delay(2000);
  digitalWrite(carYellow, LOW);
  digitalWrite(carRed, HIGH);
  delay(1000);
  digitalWrite(pedRed, LOW);
  digitalWrite(pedGreen, HIGH);
  delay(crossTime);
  for (int x=0; x<10; x++) {
    digitalWrite(pedGreen, HIGH);
    delay(250);
    digitalWrite(pedGreen, LOW);
    delay(250);
  }
  digitalWrite(pedRed, HIGH);
  delay(500);
  digitalWrite(carRed, LOW);
  digitalWrite(carYellow, HIGH);
  delay(1000);
  digitalWrite(carYellow, LOW);
  digitalWrite(carGreen, HIGH);
  changeTime=millis();
}

void loop() {
  // put your main code here, to run repeatedly:
  int state=digitalRead(button);
  if(state == HIGH && (millis() - changeTime)> 5000){
    changeLights();
  }
}