Rail road crossing Effect ( LED and Buzzer)

1//ARDUINO CODE FOR FLASING LED LIGHT WITH BUZZER FOR A RAIL ROAD CROSSING  EFFECT
2void setup(){
3  pinMode(13,OUTPUT); //pinMode for power output from  The Arduino
4  pinMode(12,OUTPUT);
5  pinMode(11,OUTPUT);
6}
7void loop  (){//STARTING A VOID LOOP
8digitalWrite(13,HIGH);//digitaWrite(1)turns on the  LED for the time period of 1 second.          
9delay(100);
10digitalWrite(13,LOW);//digitalWrite(2)  turns off the LED for the time period of 1 second.
11delay(100);
12digitalWrite(12,HIGH);//digitaWrite(3)turns  on the LED for the time period of 1 second.      
13delay(100);
14digitalWrite(12,LOW);//digitalWrite(4)  turns off the LED for the time period of 1 second.
15delay(100);
16tone(11,1000);//tone  is code when the the buzzer rings.
17delay(25);
18noTone(11);// noTone is the  time period when the tone stops.
19
20}
21//[NOTE:The delay btw all the digitalwrites  and Tone can be tweaked as per the use]
22// This all the code Required for a FLASING  LED LIGHT WITH BUZZER FOR A RAIL ROAD CROSSING EFFECT.
23