I really need to know if is possible to solve this problem:
I have some sensors attacched on analog inputs on an arduino duemilaenneove board. Inputs read works fine, but sometimes i need to know when a sensor is unplugged, so i
unplugged one and the result is:
I don't understand why voltage isn't 0 when I have no input on the port.
I can fix that using a range of accepted values, but with a 0 value is easier.
Is it a mine mistake? :'( :-?