Stepper/servo motor control....

[Bill the arcstarter]

"Michael D. Porter" <mporter at zianet.com> wrote:
>I have determined that I can do what I need with a circuit to control a 
>stepper or servo motor from a variable resistance. What I need is a
>motor/circuit combination which will provide an absolute position for a 
>given resistance. For reasons of cost, the cheapest means of input for 
>altitude is a barometric sensor for an L-Jetronic digital fuel injection 
>system--essentially, the input device is a sealed bellows with a strain 
>gauge inside.

Yes there is a very (sl)easy way to do this.  Buy a steering servo for an RC 
car or plane.  This contains the motor, feedback device, and all.  You have 
to feed it a pulsetrain (PWM).  The duty cycle determines the shaft 
position.

I'm thinking about doing the same for a buddy's diesel wabbit injection 
pump. ;)

This has been hacked to death in other electronics sites on the 'net.  Don 
Lancaster's for example.  Also look around the PIC lists and sites. If you 
need more help perhaps I can give it?

-Bill




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