[sdiy] Rotary encoder

[mark verbos]

On Jan 11, 2009, at 12:15 PM, Tom Wiltshire wrote:

>
> On 11 Jan 2009, at 16:03, Simon Brouwer wrote:
>
>> Ingo Debus schreef:
>>> If you want to interface a standard 1 * 12
>>> rotary switch to a microcontroller without additional circuitry you
>>> need 12 inputs.
>>
>> Or 11 resistors and one A/D input.
>> Nowadays even very cheap microcontrollers have A/D.
>
> PIC 12F675 would do it. 6 i/o pins, so you use one as an A/D input,  
> and four as your outputs. The chip costs less than a £1, and the  
> associated code would take ten minutes.
>
> Still, I don't really see why you can't just use a 16-position hex- 
> coded rotary switch with an end-stop at 12 positions. After all,  
> this thing that we're spending time trying to invent does actually  
> already exist!
>


Hence my original question.

Mark