[simpits-tech] Hall effect sensor question

[dabigboy at cox.net]

Excellent info and very informative, thanks! As a matter of fact it had occurred to me that I might use two or more sensors to cover 360*. Now if the response of the sensors at 180* does follow a steady, predictable sine angle, I can use trig functions in my code to account for it.

I think it is time to order some sensors!

Matt

---- wledzian1 at comcast.net wrote: 
> A hall effect sensor returns signal proportional to the strength of the magnetic field through the sensor element. This strength varies as the sine of the angle between the field lines and the sensor element, measured parallel to the sensor. That is to say, the sensor will output the least voltage when the field is perpendicular to the sensor, and most voltage when it is again perpendicular 180° away. The response is not linear. It is reasonably linear if you limit the range to +/- 45° or so, and usable to 180° if you account for the sinusoidal nature and back-calculate an angle. If you have two sensors at right angles within the field, you can use their readings to calculate an exact angular position over 360°. 
> 
> -Wayne 
> 
> ----- Original Message -----
> From: dabigboy at cox.net 
> To: "Simulator Cockpit Builder's List" <simpits-tech at simpits.org> 
> Sent: Monday, October 22, 2012 6:02:22 PM 
> Subject: Re: [simpits-tech] Hall effect sensor question 
> 
> 
> ---- Roy Coates <roy at flightlab.liv.ac.uk> wrote: 
> > 
> > I'm sure I did. I also used an analogue meter so that I could better see 
> > how it what reacting. 
> > 
> > I'll have some students doing some setup work with these over the next week 
> > or two - if you're not in a desperate hurry I can post their results for 
> > you. 
> 
> No rush at all, that would be great! Thanks Roy! 
> 
> Matt 
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