Why LED light delay is 5 second in arduino?

Question

My code :

int pin = 8;
int pout = 12;
int result=0;
void setup() {
  pinMode(pin, INPUT);
  pinMode(pout, OUTPUT);  
}

void loop() {

  result = digitalRead(pin);

  if(result == 1)
  {
    digitalWrite(pout, HIGH); 
    delay(1000);
  }
  if(result == 0)
  { 
    digitalWrite(pout, LOW); 
  }

}

I have set delay 1 sec but whenever i put high voltage on pin 8 The LED glow for 5 second. why?

How to set delay to none ? means whenever the pin 8 is HIGH the LED will glow else off.

Answer 1

The problem (likely) isn't in your code. You need to include a pull-down resistor in your electronics, so that when you remove the "high voltage" the residual charge stored in the pin due to its capacitance can be drained. Alternatively you can use the internal pull-up resistors, but then you'd need to invert the logic of the pin (high becomes low and vice versa) and instead of connecting "high voltage" you'd need to connect ground to activate the LED.