Bob, what sort of stepper motor and gear setup did you use?

At 04:49 PM 1/2/2004 +0000, you wrote:
>On Fri, 2 Jan 2004 07:12:52 -0500, you wrote:
> >In a nutshell, they used a DC gearhead motor with a lever arm mounted on the
> >shaft.  The end of the arm was connected to the inside of the throttle
> >cable.  The outside of the throttle cable was clamped to the unit.
> >
>Sounds similar to a cruise-control I built back in 1995 using a 68HC11E2
>for my F-150. I used a stepping motor driving a gear reduction, with the
>lever arm on the end of the driven gear connected to a standard throttle
>cable.
>
> >The
> >outer control loop adjusted the motor position to keep the engine speed at
> >the desired value.  The engine speed was measured by feeding the tachometer
> >pulses into a CCP input.
> >
>In my case the idea of course is to keep the vehicle speed constant, the
>speed being derived from the 8000 pulse per mile signal they use to
>run the speedometer. No inner control loop was need due to using the
>stepper motor instead of DC gearhead motor.
>
>Much to my surprise, that thing is still running even though it was
>hand wired on perf-board :)
>
>Bob
>
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Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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