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the exp bd inputs plug into the inputs on the main HB. so you still
have to remove the pullup on the main HB.
just cut the short trace on the underside of the board between the
signal input pin and the pullup resistor.
f.
In your message you said:
> Hi all,
>
> I'm trying to connect a pair of GP2D12 to my handyboard. I know there is an
> issue with the handyboard pull-up resistors and these devices so I figured
> I'll try to use the unused LEGO sensor connectors on my expansion board (I
> don't have any LEGO sensor anyway).
>
> So I removed the resistor pack RP2 on my expansion board. According to my
> understanding of the expansion board layout, those are the one providing the
> pull-up for the 4 LEGO input, RP2 is a 10Kx5 used only for this purpose.
>
> And of course it's not working :^(. I still got a 255 (251 to be exact)
> readout on analog 28-31 without anything connected and I was expecting to
> read 0 from there... And because of that my GP2D12 are still not working
> correctly.
>
> What did I miss? What else should I do to transform these into floating
> inputs?
>
> -- Eric
>
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Message is in Reply To:
 | | resistor pull-up help!
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| Hi all, I'm trying to connect a pair of GP2D12 to my handyboard. I know there is an issue with the handyboard pull-up resistors and these devices so I figured I'll try to use the unused LEGO sensor connectors on my expansion board (I don't have any (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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