[sdiy] MIDI VOL PEDAL with no micro??

[Dan Snazelle]

what would be the best book on this sort of detailed information on reading/ sending midi messages and midi hardware ?

i have a penfold book on the subject but i bought that years ago and its pretty surface... it basically shows you how to make a midi patchbay.


thanks



Sent from my iPhone

> On Feb 8, 2014, at 3:00 PM, "Scott Gravenhorst" <music.maker at gte.net> wrote:
> 
> 
> Dan Snazelle <subjectivity at hotmail.com> wrote:
>> thanks for the practical advice!!
>> 
>> 
>> ive made midi things with an avr before and other than trying to 
>> get my friend comfortable with learning some code ( or pasting 
>> some) i think its the easiest way to go 
>> 
>> 
>> just what exactly would you do with shift registers, and a ADC... 
>> in other words, the CC message, if you wanted to make a CC #1 
>> pedal...would it just be the same conversion to 1's and 0's over 
>> and over??
> 
> The ADC could be a bit of work too if done all in CMOS.  It would work the same way it
> would work in an AVR, yes, a loop that gets the ADC value (converted from the pot) and
> constructs the CC #1 message (3 bytes if you ignore running status).
> 
>> 
>> i wonder ( from the bending angle) if you could get any good 
>> results from sending sporadic bursts of 8 bit digital information 
>> via an opto to a synth?
> 
> The data needs to be structured into MIDI messages.  You could simplify slightly by not
> using running status - then you'd always send 3 byte messages.  In that case if you sent
> random data as the third byte (forcing bit 7 to zero), you would then be sending a CC
> message at some regular interval with a databyte that is random from 0 thru 127.  Dunno how
> useful that would be, probably depends on the user.
> 
> 
>> 
>> Sent from my iPhone
>> 
>>> On Feb 8, 2014, at 2:30 PM, "Scott Gravenhorst" <music.maker at gte.net> wrote:
>>> 
>>> 
>>> 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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