traffic_light_call.ino

int carRed=4;
int carYellow=3;
int carGreen=2;
int pedRed=9;
int pedGreen=8;
int button=0;
int crossTime=5000;
unsigned long changeTime;

void setup() {
    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 loop() {
    int state=digitalRead(button);
    if (state==HIGH&&(millis()–changeTime)>5000) {
        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);
    delay(500);

    digitalWrite(carYellow, HIGH);
    digitalWrite(carRed, LOW);
    delay(1000);

    digitalWrite(carGreen, HIGH);
    digitalWrite(carYellow, LOW);

    changeTime=millis();
}