[sdiy] MIDI VOL PEDAL with no micro??

[Scott Gravenhorst]

Dan Snazelle <subjectivity at hotmail.com> wrote:
>is it possible to create a MIDI volume pedal with nothing but an 
>optocoupler, opamps, cmos and passives? 
>
>
>i ask because i have a friend who wants to make one himself
>
>id just use an AVR with an opto and a pot based pedal.... but i 
>thought it might be fun to go the other route 
>
>
>are CC messages complex? i wouldnt dare try this with SYSEX but i 
>thought a CC pedal might be within the realm of possibility! 
>
>
>thanks

I'd use the AVR or a PIC.  But yes, with enough CMOS parts you could
make a state machine that could handle it.  However, you'll need to add
a UART and bit clock (unless you want to build that out of CMOS too). 
In my view, the complexity is enough to warrant a uProc.  Think of all
the things the uProc would have to do - all of that would have to be
represented in CMOS logic.



-- ScottG
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