Author Topic: Magnetic (hall effect) rotary encoder knob?  (Read 1122 times)

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Offline 3dgeoTopic starter

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Magnetic (hall effect) rotary encoder knob?
« on: April 25, 2019, 04:02:04 pm »
Hello,

currently I'm using low profile 30 step regular rotary encoders, but due to their low profile they are a bit wobbly and they skip steps when rotating faster.
So I was wondering, what about magnetic rotary encoder?
I googles and found almost perfect (at least on a paper) IC: as5601. I wrote "almost" for a reason, looks like this IC has only one I2C adress (tried to contact AMS about it but their support is awful...) and it doesn't have interrupt pin which is kinda important in my opinion, cos now constant pooling is necessary. Well, interrupt is not a deal breaker – in a worst case scenario some sort of interrupt can be hacked from A/B output...
What You think? Know better IC?

I know that mechanical part design will be needed, but compared to "regular" encoder this will be a huge improvement in precision and user experience.

EDIT:
I found even better chip in all aspects: it has interrupt, different I2C addresses, way smaller and half a price: TLE493, take that AMS :D
« Last Edit: April 26, 2019, 01:09:24 am by 3dgeo »
 

Offline Tek Tech

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Re: Magnetic (hall effect) rotary encoder knob?
« Reply #1 on: April 25, 2019, 09:22:58 pm »
Hello,
currently I'm using low profile 30 step regular rotary encoders, but due to their low profile they are a bit wobbly and they skip steps when rotating faster.
So I was wondering, what about magnetic rotary encoder?
Just a suggestion: perhaps, alternatively to Hall effect, you could consider hacking the photo-encoder from intellimouse wheel? I think it has 24 interruptions in a full circle.

Either way, it's quite an interesting project.

Edit:
There are rotary photo-encoders available for around $30. 8-64 pulses per revolution.
https://www.digikey.com/product-detail/en/bourns-inc/EM14A0D-C24-L064S/EM14A0D-C24-L064S-ND/954403

« Last Edit: April 25, 2019, 09:49:24 pm by Tek Tech »
 

Offline 3dgeoTopic starter

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Re: Magnetic (hall effect) rotary encoder knob?
« Reply #2 on: April 26, 2019, 12:15:59 am »
Thank You, thats an interesting suggestion, tho I need encoders for mass production and low profile – one off hack is not an option plus there are 2 encoders in the product, so using 2* 30USD encoders would increase price dramatically.
I'm curious how much it would cost to order slightly modified (without "guts") regular encoders...

I didn't mention that those chips encode in 12bit value, so 4096 steps per revolution, guess I'll have to buy few chips from third party and try them out (as I said AMS support sucks, hope their products doesn't :) ).
 

Offline Tek Tech

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Re: Magnetic (hall effect) rotary encoder knob?
« Reply #3 on: April 26, 2019, 12:43:34 am »
FYI, there is another type of optical encoder for $10 a piece or around $6 bulk price.
https://www.digikey.com/product-detail/en/c-k/ENCOS16D2S65C/CKN11528-ND/7802517

Other vendors (your local vendors?) may offer it even cheaper.

Good luck with your project.
 

Offline 3dgeoTopic starter

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Re: Magnetic (hall effect) rotary encoder knob?
« Reply #4 on: April 26, 2019, 01:06:18 am »
Only 16 steps per revolution, that's too little, I need at least 30.

Great news – I found even better chip in all aspects: it has interrupt pin, different I2C addresses, way smaller and half a price: TLE493, take that AMS :D I'll update main post.

P.S. why aren't You sleeping, it's 3 at night in Poland :D
« Last Edit: April 26, 2019, 01:11:50 am by 3dgeo »
 


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