little confusion in analog stuffs

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Bhuvanesh123

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Code: 
void setup()
{
  Serial.begin(9600);
 }
void loop()
{
  int a= analogRead(3);
  Serial.println(a);
  delay(1000);
}

but i have not connected anything to that analog pin but i am getting values around 500.whats the reason for that
 

My mind-reading skills have failed me, I am unable to determine what you are talking about. Perhaps a microprocessor? Maybe a spaceship? And your circuit? Maybe it's a modulated neutrino-beam device or an automatic tomato picker?

If you expect someone to help you, show a minimum amount of effort by posting an intelligent question. Don't throw up 5 lines of code and expect the world to know what you're talking about.
 

Bhuvanesh123 said:
but i have not connected anything to that analog pin but i am getting values around 500.whats the reason for that
Click to expand...
If there's nothing connected to the input pin, then it's voltage is random/undefined.

If you want the voltage on that pin to be 0V, then connect it to 0V.
 

seems to me as you are working on arduino.... if analog pin is floating then it will pick interference, feed known voltage into this pin and verify values.
 

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