/*
  The analogWrite() function uses PWM, so if you want to change the pin you're
  using, be sure to use another PWM capable pin. On most Arduino, the PWM pins
  are identified with a "~" sign, like ~3, ~5, ~6, ~9, ~10 and ~11.

*/

int led = 9;   // the PWM pin the photo flash LED is attached to
int led1 = 3;  // PWM pin number for welding flash.

// the setup routine runs once when you press reset:
void setup() {
  // declare pin 9 to be an output:
  pinMode(led, OUTPUT);
  pinMode(led1, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {

  for (int i = 0; i < 100000; i++) {
    if (i % 240 == 0) { //For welding random flash
      analogWrite(led1, 0);
      delay(30);
    }

    if (i % 375 == 0) { //For welding random flash
      analogWrite(led1, 255);
      delay(20);
      analogWrite(led1, 0);
      delay(30);
      analogWrite(led1, 80);
      delay(5);
      analogWrite(led1, 0);
      delay(5);
    }

    if (i % 7500 == 0) { //For camera twin flash once in a while
      analogWrite(led, 255);
      delay(20);
      analogWrite(led, 0);
      delay(300);
      analogWrite(led, 255);
      delay(30);
      analogWrite(led, 0);
      delay(5000);
    }
  }
}

int ledPolice1 = 10;  // PWM pin number for police light1
int ledPolice2 = 11;  // PWM pin number for police light2
int hazardLight = 9; // PWM pin number for vehicle hazard light
int railwayCrossing1 =6;
int railwayCrossing2 = 5;
int m=1;

void setup() {
  // declare pin 9 to be an output:
  pinMode(hazardLight, OUTPUT);
  pinMode(ledPolice1, OUTPUT);
  pinMode(ledPolice2, OUTPUT);
  pinMode(railwayCrossing1, OUTPUT);
  pinMode(railwayCrossing2, OUTPUT);
}

void loop() {
analogWrite(railwayCrossing1,0);
analogWrite(railwayCrossing2,0);

  analogWrite(hazardLight, 0);
 analogWrite(ledPolice1, 100);
 analogWrite(ledPolice2, 0);
 delay(200);
 analogWrite(ledPolice2, 100);
 analogWrite(ledPolice1, 0);
 delay(200);

  for (int i = 0; i < 25; i++) {
    analogWrite(hazardLight, i*4);
      delay(5);
   }
 railwayCrossingBlink();
}

void railwayCrossingBlink()
   {
    if (m==1) {
      analogWrite(railwayCrossing2,0);
      delay(5);
      m=2;
    } else {
      analogWrite(railwayCrossing1,0);
      delay(5);
      m=1;
    }
     for (int i = 0; i < 100; i++) {
        analogWrite(m==1?railwayCrossing1:railwayCrossing2, i*2);
      delay(1);
   }
   }