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Easy to build quadrature encoder for robot applications.
Features:
This project was cancelled.
After a long, long time I managed to find a (at least for me) perfect, of the shelf and still affordable encoder...
It is small (23mm diameter), comes with a housing, contains the complete quadrature sensor and output electronics and costs about 10EUR:
Agilent HEDR-54xx (by Avago Technologies)
Only drawback:
Without modifications, the encoder has to be mounted at the end of an (obviously short) axis. You can not just put the
axis through the encoder and mount a wheel on the same side.
In this case, you might need something like shown in the last picture on this page...
Otherwise, a sure buy.
Checkout Agilents (Avago Technologies) HEDR-54xx (PDF) series,
available for 2, 3, 4 and 5mm axes:
The encoder wheel is not fixed. It has to be slipped onto the axis.
The encoder wheel itself...
Note the single marking on the outer ring.
Obviously there exists an indexed version too.
The PCB has a few pads left for a second sensor...
The interieur...
A minor drawback. It has a 5 pin, 1mm pitch connector...
I found some ready to use cables, but unfortunately I did
not manage to get my hands on the housing, yet...
Fortunately the mechanic guys left some space for soldering...
BTW.: The funny triangular part is used to push the encoder wheel
onto the axis, after the housing was mounted... Nice idea!
And yes. The 4mm variant is FT compatible ;)
Case closed...
Get one! I bought mine here.
ASkr 2008-2009
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