Isolating IR receiver from disruption? I'm using a simple IR receiver connected to the Arduino through A0 analog pin. The problem is that I want to stabilize the output of IR receiver when it's not receiving an IR signal from a specific IR source, or at least minimizing the disruption to a specific range that I can handle, no matter where its position, But in my case moving the IR receiver a few inches in any direction will results in different voltage output. the difference between values on disruption is very random to handle.  

What can I do to isolate IR receiver, may be a specific material or a specific color?
I would suggest two things. First You could put electrical tape around the receiver in such a way that it will only pick up signals from a certain direction. Also you could use low and high pass filters to accept input only in the 38khz range(range of most infra red remotes).  Keep in mind that you will need a couple of rounds for it to work effectively.