Magnetic encoder

VK3ZYZ

Moderator
Staff member
A couple of days ago, 2 x AS5600 magnetic encoders arrived.
1639441903759.png

These use a special magnet and 4 x Hall sensors in the chip to read a 12 bit position. So, less than 1/10th of a degree resolution per rev.
The beauty of these devices is the position reading does not get lost when power is removed. (I think)
I hope to use them as antenna tuning and direction reading.
Here is a video talking about them, and the Arduino code he uses.....

Data sheet....

These chips are I2C devices, but also will output a 12 bit PWM signal.
Not bad for about $5.
Watch this space for more info.
 
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VK3YNV

Administrator
Staff member
There was an open source project using these magnetic encoders to provide closed loop control of stepper motors, I think there was one that could be retrofitted to existing steppers. As such it would make a nice upgrade for 3d printers and small desktop mills.

Also, a center pivot irrigator I worked on used them for non-volatile position feedback. You can't have a center pivot forget where it is what with trees and fences... :)
 

VK3ZYZ

Moderator
Staff member
Here is a 3D printed enclosure for the AS5600 board.
Photo on 27-12-21 at 10.21 am.jpg
Photo on 27-12-21 at 10.22 am.jpg


I'm printing a mod for it to add mounting to the base and a belt drive knob.
AS5600Mods1.png
 

VK3ZYZ

Moderator
Staff member
Different sized pulleys and the base with mounting tabs.
Photo on 27-12-21 at 2.29 pm.jpg

The 80 tooth pulley will allow a multi turn shaft reading if driven from a smaller pulley.
All the pulleys have a recess to add a top bearing so the plastic shaft will not be the only thing bearing the load.
 
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