[simpits-tech] Zero point on a two needle altimeter

[Matt Bailey]

I thought you were using EPIC for the engine instruments?

	-Matt Bailey

Rod Dale wrote:
> 
> Sorry, I meant that I used a stepper motor on the altimeter - not a servo.
> You have to modify the servo to enable  > 360 degree rotation. I haven't
> been game to try that yet.
> I intend to use Phidgets for all my engine instruments - next job on the
> bench.
> Rod
> ----- Original Message -----
> From: Gene Buckle <geneb@deltasoft.com>
> To: <simpits-tech@simpits.org>
> Sent: Sunday, October 27, 2002 11:06 AM
> Subject: Re: [simpits-tech] Zero point on a two needle altimeter
> 
> > > I tried that. I connected the servo to the arm that connects to the
> bellows
> > > but because the gearing is very fine, a quarter turn of the servo put me
> > > from 0 feet to 5000 ft !!!! The bellows don't move much at all. I ended
> up
> > > ripping the inners out of the altimeter and connected the servo to the
> > > centre shaft.
> >
> > Rod, you might try it again under Phidget control.  With a phidget, you
> > can get tenth degree precision if the servo is high quality.
> >
> > g.