[Diy_efi] Stepper Motor to drive mechaical speedo

[David Allen]

If all you are doing is scaling the frequency, it can be done fairly easily.

I wrote a simple program that was based on counting program cycles and 
multiplying (or dividing by a scalar).

It would count program cycles between low>high transitions on the input 
signal.

Then divide this by the scalar, and toggle the output after the scaled 
number of program cycles.

The scalar is read from an ADC input fed from a 15-turn pot. Therefore the 
device can be adjusted on-the-fly.

Very quick, cheap, and dirty - but it works surprisingly well.

Sincerely,
David

----- Original Message ----- 
From: "Milosz Kardasinski" <miloszk at gmail.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, October 22, 2012 4:56 PM
Subject: Re: [Diy_efi] Stepper Motor to drive mechaical speedo


> Take a look at Microchip app note DS01146B (Compiled Tips N' Tricks).
> It explains how to use the PIC's CCP hardware to measure frequency of
> a square wave signal and also hardware PWM of a DC motor.
>
> MK.
>
> On Mon, Oct 22, 2012 at 3:49 PM, Hugh Keir <hugh at sol.co.uk> wrote:
>
>>>It would be great if someone can show how to manipulate the pulses from
>>>the hall sensor with a PIC.
>>>
>>>Thanks
>>>
>>>Hugh
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/diy_efi
>