Re: Rotary encoder

Pete 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.

Many thanks,

Pete

Digi-key carries phototransistors from a number of manufacturers. The last time I disemboweled a mouse the phototransistors were pretty standard looking parts. Look in the Digi-Key catalog.

You can also get LED-phototransistor pairs that are already mounted in handy little holders -- this is a good thing if you are making your own mechanical assembly, because it saves you having to make the mounts.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
.

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