[Diy_efi] Stepper Motor to drive mechaical speedo

[Mike]

In my own experience of motor controls, I'd go with that too, PWM drive
from a simple analog circuit, get the input from wheel sensor or on diff
or on tailshaft and feed a cheap dc motor which is coupled to the existing
speedo. If you want to can provide some feedback, that way it will be
more linear and rather more responsive. Ideally a small single chip micro can
do the job, provides more precise calibration and then you have option
to store data as well cheaply via a one wire digital out to a data logger etc
regards
mike

At 01:09 AM 15/10/2012, you wrote:
>I'd go DC with pwm. I suspect you can get within 5% which should be good enough for daily driving...but not for rally nutz like steve  :-)
>
>
>--
>Bruce McKenzie brucem at dynamicrange.com -- <http://www.linkedin.com/in/bruceMcKenzie>http://www.linkedin.com/in/bruceMcKenzie
>
>----- Reply message -----
>From: "Hugh Keir" <hugh at sol.co.uk>
>To: <diy_efi at diy-efi.org>
>Subject: [Diy_efi] Stepper Motor to drive mechaical speedo
>Date: Sun, Oct 14, 2012 9:39 AM
>
>
>My reason for wanting to keep the original speedo in place is just that, I
>want the car to look original.
>
>Thanks
>
>Hugh
>
>
>> On Sun, Oct 14, 2012 at 11:59:05AM -0400, ScottyGrover at aol.com wrote:
>>> An analog (needle) speedo is easier to read and provides more
>>> (intuitive)
>>> information than a digital unit.
>>
>> I once thought the same thing, coming from a background in electronics
>> where analog is still alive and well.  However, finally having two
>> vehicles with a digital speedo readouts has convinced me otherwise. To
>> be truthful, the analog speedo on my '10 Camaro is just about
>> unintelligible.
>>
>>   --Brian
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>
>
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