int carRed = 12; //assign the car lights
int carYellow = 11;
int carGreen = 10;
int button = 9; //button pin
int pedRed = 8; //assign the pedestrian lights
int pedGreen = 7;
int crossTime =5000; //time for pedestrian to cross 
unsigned long changeTime;//time since button pressed


void setup() {
pinMode(carRed, OUTPUT);
pinMode(carYellow, OUTPUT);
pinMode(carGreen, OUTPUT);
pinMode (pedRed, OUTPUT); 
pinMode (pedGreen, OUTPUT);
pinMode (button, INPUT);
digitalWrite(carGreen, HIGH); //turn on the green lights
digitalWrite(pedRed, HIGH);
}

void loop() {
int state = digitalRead (button);
//check if button is pressed and it is over 5 seconds since last button press
if(state == HIGH && (millis() - changeTime)> 5000){
//call the function to change the lights changeLights ();
}
}

void changeLights() {
digitalWrite(carGreen, LOW);//green off 
digitalWrite(carYellow, HIGH); //yellow on 
delay (2000); //wait 2 seconds

digitalWrite(carYellow, LOW); //yellow off 
digitalWrite(carRed, HIGH); //red on
delay (1000); //wait 1 second till its safe
digitalWrite (pedRed, LOW); //ped red off 
digitalWrite(pedGreen, HIGH); //ped green on
delay (crossTime); //wait for preset time period

//flash the ped green
for (int x=0; x<10; x++) {
digitalWrite(pedGreen, HIGH);
delay (250);
digitalWrite (pedGreen, LOW);
delay (250);
digitalWrite(pedRed, HIGH);//turn ped red on 
delay (500);
}

digitalWrite(carRed, LOW); //red off 
digitalWrite(carYellow,HIGH);//yellow on delay (1000);
digitalWrite(carYellow, LOW); //yellow off
digitalWrite(carGreen, HIGH);
changeTime = millis(); //record the time since last change of lights
//then return to the main program loop
}