Yigit Turgut wrote:
> Pot and 1.5v battery are connected to AN0 all in series.Ground of
> battery is connected to ground of the circuit.

We still don't know how things are really connected.  Pots have 3 terminals=
..
You have only explained how two are connected, and not even which two.

>> Also, your circuit doesn't show any power bypass caps in place.
>
> There is a 220nF capacitor connected to VUSB (14) pin of PIC,

Any you can wave a dead fish over it too, but you still won't have any
bypass caps.  Also 220nF is very low for Vusb.  I think it was the lowest
allowed in some early documentation and may even be below spec now.  Why cu=
t
it so close?  Leaving some margin is good engineering practise, especially
when there is no down side as in this case.  I use 1uF for this.  Some earl=
y
documentation may have given the impression this is too much, but I have
explicit information from Microchip that it is not only fine, but a good
idea.

> sorry didn't mention that.

Actually your schematic did show the Vusb cap.  However, the comment was
about bypass caps.


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