const int led = 9;
const int button = 7;
int val = 0;
int brightness = 128;
int state = 0;
unsigned long startTime = 0;
int old_val = 0;
void setup()
{
  pinMode(led,OUTPUT);
  pinMode(button,INPUT);
}
void loop()
{
  digitalRead(button);
  if((val==HIGH)&&(old_val == LOW))
  {
    state = 1 - state;
  startTime = millis();
  delay(10);
}
if((val ==HIGH) && (old_val = HIGH))
{
  if(state ==1 && (millis() - startTime) >500)
  {
    brightness++;
    delay(10);
    
    
    
    if (brightness > 250)
    {
      brightness = 0;
    }
  }
}
old_val = val;
if(state = 1)
{
  analogWrite(led,brightness);
}
else
{
  analogWrite(led,0);
}}