ĐÈN GIAO THÔNG ARDUINO

Code ĐÈN GIAO THÔNG ARDUINO

/*
Traffic Light
This code copied from the book Beginning-Arduino.
*/
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
}

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