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 Forum index » DIY Hardware and Software » Developers' Corner
13 key pedal board
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Grumble



Joined: Nov 23, 2015
Posts: 179
Location: Netherlands
Audio files: 7

PostPosted: Wed Nov 25, 2015 1:12 am    Post subject: 13 key pedal board Reply with quote  Mark this post and the followings unread

Hi,

Recently I have built a 13 key midi pedal board for a brother of mine.
Someone donated an old electric organ and I removed the pedal board from it.
Bought 13 micro switches, an Arduino UNO and a Nokia LCD screen.
For this purpose I have used an Arduino UNO because this particular Arduino uses an ATMEGA16U2 for communication between the Atmega328 and the USB port in my computer.
The good thing about it is that you can program the ATMEGA16U2 in a way that windows thinks this is a genuine MIDI controller, so it uses the native midi drivers from microsoft and no extra drivers or programs are necessary.
In this case I have used HiDuino, read all about it HERE

https://youtu.be/ujMXjMngTbg
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Tony Deff



Joined: May 25, 2008
Posts: 51
Location: Suffolk, UK

PostPosted: Sun Nov 29, 2015 5:12 am    Post subject: 13-note Pedalboard
Subject description: Extending the range
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You can play mathematical tricks with a 13-note pedalboard to extend its range, thus providing a much more satisfactory bass-line.

Way back in the 20th century, before microcontrollers (and probably you!) were invented, I built a two-octave bass-note generator around a 13-note pedal-board.  (It generated a 32-segment D-A sinewave with attack-sustain-decay, which sounded wonderfully smooth yet "thunky", but this is irrelevant).

By latching the binary pedal-code and subtracting the new pedal code, you have a 4-bit code representing the pedalled interval and a sign or overflow-bit indication of up/down.

You then apply a set of rules to toggle the octave.

The simplest rule is that a repeated note (interval = 0) toggles octave. This could be controlled by an option switch.

The next (generally-accepted) rule is that a leap of a seventh or sixth (say, bottom C to Bb or B or Ab) toggles to convert to a drop of a semitone, tone or third.

I used a hardware 4-bit Arithmetic-Logic (ALU) chip. A set of links from a decoder chip attached to the ALU output selected the "rules".
A microcontroller would have the satisfaction of doing some brainwork and actually controlling something.
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Grumble



Joined: Nov 23, 2015
Posts: 179
Location: Netherlands
Audio files: 7

PostPosted: Sun Nov 29, 2015 8:46 am    Post subject: Reply with quote  Mark this post and the followings unread

The first microcontroller goes back to 1971, and I'm a lot older than that Cool
In this particular design I used a pot to chose the midi octave.
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