[sdiy] rotary encoder?

[Cary Roberts]

>You could use a standard rotary switch and two 74xx148 chips. If you
>need only 10 postions, you could use one 74xx147 instead.
>
>Funny that no-one else mentioned this option. Two 74hc148 sure aren't
>more expensive than a cheap micro.

I emailed Mark this suggestion privately last night.  But the only
reason to do this over a microcontroller is if you wish to avoid using a
microcontroller.  A small PIC is a quarter of the cost (and less than
half the board real estate) of a design using 74LS148s.  Don't forget
you'll need a logic gate in addition to the two '148s.  Never
underestimate the cost effectiveness of a PIC microcontroller.


So this will end up in the archives here is my suggestions for switches
that alleviate the need for conversion logic:

"There are a couple options.  Are you stuck with a particular form
factor switch?  If not look at the 513360-12 BCD encoder from Grayhill.
Available from Allied, Avnet, and such for just over $20.  You could
also look at the 26 series but it is 22.5 degree with adjustable stop,
whereas the 51 series is 30 degree.  It's $15 in single quantity and
available from all the usual subjects.  The part number is
26ASD22-01-1-AJS."


-Cary