Have you covered the window ?

Pailoor

Don Campbell wrote:

> Hi.
>
> I'm running a PIC16C71 (EPROM Version) with a 20MHz crystal to decode
> the output from 4 Ir Remote Demodulators.  The output of the Ir sensors
> is normally high.  Each sensor is tied to a pin in the RB[7..4] range,
> and I'm using the portb interupt on change
> to time the bits coming from the sensors. Sometimes (that's the really
> irritating part) the input to the PIC drops low for up to 400us, and
> this interferes with proper data decoding.  I'm fairly certain that the
> problem isn't with the sensors themselves,
> because without the pic being powered (removed from the board), the
> outputs behave normally.  The code isn't actually being reset (I have an
> output flag to check for this), and the pins are set up as inputs.
> The PICS are, shall we say, not brand new.  Is this a likely culprit?
>
> Any advice/help that anyone may have on this is greatly appreciated.
>
> Thanks,
> Don Campbell
> dcampb@po-box.mcgill.ca

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