[sdiy] Rotary encoder

[Ingo Debus]

Am 09.01.2009 um 13:21 schrieb Louis van Dompselaar:

> However, as 74C922 are pretty expensive ($7.50 even at Futurlec),  
> it's probably
> not an ideal solution...
>

Still a brilliant idea, IMHO.
It's also handy if one wants to interface a 12 position switch to a  
microcontroller. 7 I/O ports versus 12.


>> I seem to have been mistaken in being mistaken about turning
>> 3x4 rotary switches into a marix.  At least some of them.
>> I just looked at a Lorlin 3x4 and that just needs the stop
>> removed to turn it into a 12-step switch.  If you then
>> connect:
>>  1-5-9 to Y1
>>  2-6-10 to Y2
>>  3-7-11 to Y3
>>  4-8-12 to Y4
>> and
>>  A to X1
>>  B to X2
>>  C to X3
>> it should probably work with he 74C922.