Help! Encoder for DS1802 - diyAudio
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Old 12th January 2007, 01:29 PM   #1
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Location: British Isles
Default Help! Encoder for DS1802

I've recently built Pedja's DS1802 circuit (http://www.pedjarogic.com/spot/index.html) and I'd like to use a rotary encoder for it. What are the specs that I need?

I'm actually looking at the Grayhill 25LB range, and am a little confused as to which one is suitable...

http://embrace.grayhill.com/embrace/...DF/I-51-52.pdf

I'm guessing I need the 2-bit quadrature one?

Any help would be greatly appreciated. I live in the UK so would like to source something locally if possible.

Cheers!
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Old 14th January 2007, 12:17 PM   #2
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Anyone? Just give me a clue at least.....please!
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Old 14th January 2007, 02:03 PM   #3
Rambi is offline Rambi  Netherlands
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Default Re: Help! Encoder for DS1802

Quote:
Originally posted by tifosi_f1
I've recently built Pedja's DS1802 circuit (http://www.pedjarogic.com/spot/index.html) and I'd like to use a rotary encoder for it. What are the specs that I need?

I'm actually looking at the Grayhill 25LB range, and am a little confused as to which one is suitable...

http://embrace.grayhill.com/embrace/...DF/I-51-52.pdf

I'm guessing I need the 2-bit quadrature one?

Any help would be greatly appreciated. I live in the UK so would like to source something locally if possible.

Cheers!
Yep, the 2-bit quadrature one would be the start.
But you then still need to decode the outputs into up and down pulses for the DS1802.
If you also want a display for the volume settings etc. then I would use a microcontroller, since you need one anyway for controlling the display (then also use the serial interface for the DS1802, not the up/down one).

Otherwise you could try to find some decoders like the following:
http://www.lsicsi.com/pdfs/digpot7184.pdf
http://www.lsicsi.com/pdfs/LS7183-LS7184.pdf

Seems that in your case the LS7183 is what you need.

Best regards,

Remco
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Old 16th January 2007, 01:10 PM   #4
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Thanks for your reply Remco,

I'm not too bothered about an LCD for now...just looking for an easy way to control the DS1802 in a rotary fashion. I'm not too keen on using a microcontroller - if I did then I'd go for the PGA2310 chips.

Is it not possible to get some sort of rotary encoder type device that pulses? Surely its quite a simple mechanism?
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