Do you have pull-down resistors in the reading part of the port to
ensure the "0" reading?

Francisco


yansong gu wrote:

>apology for those who received this earlier!
>
>Hi Picers,
>
>I recently made a pcb of 8x8 keypad of two "E"s facing eachother at the
>connecting point.  Somehow, the port always gives errant value when it is
>supposed to be "0" since there is no input.  Is this a capacitance or
>resistance problem?  any help greatly appreciated.
>
>
>Yansong
>
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