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Discussion Starter · #1 ·
Hi all,

Here's something which may be of interest to people still stuck using
0-5Kohm resistive potboxes!

For some conversions we're doing at EV Works, we chose controllers
which (unfortunately) only support resistive throttle inputs, but we
wanted to use the factory hall effect accelerator pedal to drive them.
So here's some information about a device I designed to interface the
two, based around a digital potentiometer:

http://www.evworks.com.au/tech/DigitalPotAdapter/

There's also a download link at the end for the schematic/PCB files
and AVR project for the microcontroller code.

Kind regards,

Ian Hooper
[email protected]

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Discussion Starter · #2 ·
Nicely done, thanks for making it available!

Bear in mind though that "resistive" throttle inputs often work perfectly
well with an 0-5V signal anyway, so in that case it's enough to amplify /
level shift the hall effect signal using just analogue components.

That also has much less complexity so seemingly lower chance of it jamming
on and driving you into a tree :)



Ian Hooper <[email protected]> wrote:

> Hi all,
>
> Here's something which may be of interest to people still stuck using
> 0-5Kohm resistive potboxes!
>
> For some conversions we're doing at EV Works, we chose controllers
> which (unfortunately) only support resistive throttle inputs, but we
> wanted to use the factory hall effect accelerator pedal to drive them.
> So here's some information about a device I designed to interface the
> two, based around a digital potentiometer:
>
> http://www.evworks.com.au/tech/DigitalPotAdapter/
>
> There's also a download link at the end for the schematic/PCB files
> and AVR project for the microcontroller code.
>
> Kind regards,
>
> Ian Hooper
> [email protected]
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
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Discussion Starter · #3 ·
On 1:59 PM, Ian Hooper wrote:
> Hi all,
>
> Here's something which may be of interest to people still stuck using
> 0-5Kohm resistive potboxes!
>
> For some conversions we're doing at EV Works, we chose controllers
> which (unfortunately) only support resistive throttle inputs, but we
> wanted to use the factory hall effect accelerator pedal to drive them.
> So here's some information about a device I designed to interface the
> two, based around a digital potentiometer:
>
> http://www.evworks.com.au/tech/DigitalPotAdapter/
>
> There's also a download link at the end for the schematic/PCB files
> and AVR project for the microcontroller code.

There is a pin-compatible 5K version:

http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf

In case that matters.

... Also do be careful, they aren't exact replacements for a physical
pot. When I was
looking for one for LCD contrast control, I soon discovered they don't
like signals
outside of their supply voltage (found one exception, it took a single
+5V supply and
it could handle -5V to +5V on the pot pins).

--
Zachary Heilig ([email protected])

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