[Diy_efi] Stepper Motor to drive mechaical speedo

Jay Rabe jayrabe
Sun Oct 14 18:33:16 UTC 2012


There are some guys that are using factory and homebrew gauges for their
driving simulators. Most are arduino driven but there's a bunch of guys
doing it. I was hoping to find a good can dash to drive off of a standalone
with an arduino translating in the middle but that's on the backburner for
a while.

http://www.x-simulator.de/forum/  you may have to dig a bit but you should
be able to find some help there.
On Oct 14, 2012 11:14 AM, "Hugh Keir" <hugh at sol.co.uk> wrote:

> Hi Guy's
>
> I have been trying to sort out a stepper motor to drive a mechanical
> speedo on a TR7.
>
> The problem started after an engine and gearbox change from a car with no
> mechanical speedo drive and also a change of diff ratio.
>
> As a first step, I bought a 28BYJ-48 12V stepper motor from ebay plus a
> controller with on board frequency generator to drive.
>
> The first problem I have faced is that the stepper motor is not capable of
> spinning fast enough to drive the speedo.
>
> It seems to peg out at about 160Hz measured at one of the stepper motor
> phases, any faster on the input and the stepper motor freezes.
>
> The declared stepper motor frequency is 100pps with a step angle of 5.625?
> and a step reduction of 1/64 on the gearbox which I calculate should be
> 2.5 RPM. I reality I am getting 18RPM, either way this is not fast enough.
>
> I intend using a GT101 hall sensor on the propshaft to feed a digital
> pulse to an as yet to be sorted stepper motor control board.
>
> I wonder if anyone has attempted anything similar?
>
> Thanks
>
> Hugh
>
>
>
>
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