int run;
int buttonPin;
int x=500;

void setup() {
  run = 0;
  buttonPin = 3;
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(5, OUTPUT);
  pinMode(9, OUTPUT);
  digitalWrite(5, LOW);
  digitalWrite(9, LOW);
}
void loop()
{

  if(digitalRead(buttonPin) == LOW)
  {
     if(run == 0)
     {
         run = 255;
     }
     else
     {
         run = 0;
     }
  }

  if(run > 0)
  {
  for(int j=0; j<3000; j++) {

  for(int i=0; i<5; i++) {
  digitalWrite(9, LOW);
  delayMicroseconds(x);
  digitalWrite(9, HIGH);
 // delayMicroseconds(x);
  }
  if(x>150) x--;    //
}
  }
 }