Re: Rotary encoder
- From: John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 19 Dec 2005 18:15:11 -0600
On Mon, 19 Dec 2005 22:20:57 GMT, no-one@xxxxxxxxxxxxxxxx (Robert
Scott) wrote:
>On 19 Dec 2005 12:07:30 -0800, "Pete" <designelect@xxxxxxx> wrote:
>
>>Hi,
>>
>>I need to make a rotary encoder which fits onto a motor shaft from
>>which I will read the amount of movement in both directions.
>>
>>The way I want to do this is by using a mechanism similar to that found
>>in a ball mouse where a slotted wheel interrupts the light to a pair of
>>sensors.
>>
>>I've taken apart a couple of mice but can't find any markings on these
>>devices (phototransistors). If anyone could point me in the right
>>direction for a manufacturer, I would be very grateful.
>
>Before you re-invent the rotary encoder, look around for an
>off-the-shelf solution. There are many many forms of rotary encoder
>packages. They come in a wide range of resolutions. Most of them
>have their own shaft which you would have to couple to your motor
>shaft. However there are also the "hollow shaft" type that can be
>fitted onto an existing shaft. In searching, use the term
>"incremental encoder".
---
Unfortunately, an incremental encoder won't supply him with the
directional information he needs, so his search term needs to be
"absolute encoder", and he'll also need to specify the resolution he
requires.
--
John Fields
Professional Circuit Designer
.
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