[simpits-tech] Common aviation gauges that are air-core?

[Gene Buckle]

On Wed, 4 Apr 2012, dabigboy at cox.net wrote:

>>> - Successfully driven an air-core motor....woohoo!!!
>>>
>> I'd love to see the code for this.  Care to post a demo? :)
>
> Really? I'm flattered! :) I took one of the example sketches and 
> modified it extensively to suit my needs (I tend to prefer taking 
> *working* code when I am learning, and modify it one step at a time as 
> needed....I'm a hand-on learner and this avoids a lot of frustration). 
> Pardon me if this is obvious to you already, but basically I'm just 
> using pulse-width modulation to deliver an "average" voltage to each of 
> the motor's two poles, with the voltages being the inverse of each other 
> (the X and Y values of a sine wave, basically). If you wanted to get 
> cute, you could use the Arduino's built-in trig functions to simply pass 
> the Arduino an integer representing whatever info you want the gauge to 
> display, convert it to a value between 0 and 1.0, and figure the X and Y 
> values using sin() or cos().
>
Very slick, thanks for sharing!

>> Any single needle instrument that doesn't need more than 360 degrees of
>> rotation is a perfect candidate for air-core motors.
>
> Well, what I'm really interested in is driving REAL instruments, without 
> hackerizing them. :) So far I have learned by finding sweet deals on 
> ebay and then tearing into the instrument to see what makes it tick 
> (like the ADF indicator). I suppose I can keep going this route, so long 
> as it doesn't get too expensive. :)

You _really_ need to get a copy of Building Recreational Flight 
Simulators, Matt.  There's a section dedicated to doing this exact thing.

g.

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