[sdiy] Rotary Encoder Design

[ASSI]

On Samstag, 25. Juli 2020 21:58:22 CEST Ben Bradley wrote:
> Now that I see that, I remember seeing a similar magnetic rotary
> sensor years ago, that probably gave me the idea for this. The reason
> I came up with using two single-axis Hall effect sensors is two of
> them are still several dollars less than a one-chip angle sensor at
> about $6 each.

You don't do that.  By the time you've figured out the how to align and 
calibrate the magnetic circuits you'll be several times that dollar amount 
short unless your time is worth nothing.  Instead you use a sensor that has 
multiple Hall elements integrated and the necessary compensation already built 
in, like the TLV493D (disclosure: I work for the manufacturer, but not on that 
product line).  There's an eval kit that comes with magnetics and everything 
should you want to try it:

https://www.infineon.com/cms/en/product/sensor/magnetic-sensors/magnetic-position-sensors/3d-magnetics/tlv493d-a1b6/
https://www.infineon.com/cms/en/product/evaluation-boards/mini_control2go/

There's even code on GitHub that you can crib (it also has the 3D print data 
for the knobs).

https://github.com/Infineon/TLV493D-A1B6-3DMagnetic-Sensor


Regards,
Achim.
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