const int ledPin = 13; 
const int inPin = 2; 
const int debounceTime = 20; 
 
const int fastIncrement = 1000; 

const int veryFastIncrement = 4000; 
int count = 0; 

void setup()
{
 pinMode(inPin, INPUT);
 digitalWrite(inPin, HIGH); 
 pinMode(ledPin, OUTPUT);
 Serial.begin(9600);
}
void loop()
{
 int duration = switchTime();
 if( duration > veryFastIncrement)
 count = count + 10;
 else if ( duration > fastIncrement)
 count = count + 4;
 else if ( duration > debounceTime)
 count = count + 1;
 else
 {
 
 if( count == 0)
 digitalWrite(ledPin, HIGH); 
 else
 {
 digitalWrite(ledPin, LOW); 
 count = count - 1; 
 }
 }

 Serial.println(count);
 delay(100);
}

long switchTime()
{
 
 static unsigned long startTime = 0; 

 static boolean state; 
 if(digitalRead(inPin) != state) 
 
 startTime = millis(); 
 
 if( state == LOW)
 return millis() - startTime;
 else
 return 0; 
}