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midi organs pedals velocity sensitive
midi organs pedals velocity sensitive
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Old 12th March 2014, 10:45 PM   #1
t91wheeler is offline t91wheeler  United States
diyAudio Member
Join Date: Mar 2014
Default midi organs pedals velocity sensitive

New to site, so sorry if this has already been covered ad nauseam.

I wanted to buy an old set of organ pedals from say a Hammond B3 or A100 and make a set of midi pedals out of them...but unlike organ pedals I must have velocity sensitive.

I am mechanical guy, so am limited in knowledge. Plan was to take existing midi keyboard and use guts. Not sure if I can use switches from keys or not. I am guessing they are mounted on one long PC board, whose spacing would not match foot pedal spacing. Was thinking I could fabricate my own switches for each pedal and connect them in the same way the switches on the keyboard are connected to their control board(s). Don't understand what type of switch(es) I need to get both on/off + velocity sensitivity. This is my main question. If you can help, I would appreciate. Assuming something like on/off + plus some kind of variable output (analogous to piezo) to get original volume before decay starts (?) If I can understand this better, pretty good at mechanically rigging something up...I plan on tearing into an old velocity sensitive keyboard as soon as I find the time. This may make it self evident, but would appreciate a little help.
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Old 12th March 2014, 11:33 PM   #2
geraldfryjr is offline geraldfryjr  United States
diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
You would need to use two switch's to detect velocity.
I had a similar discussion about this a while back.
The are many projects as such as this that can be found on the web that uses a PIC controller to detect the switch's and send the MIDI data out.

I am just getting in to this sort of thing myself and learning to work with PIC chips.
My goal is to build a MIDI drum controller that has velocity as well and I have found many versions out there.

Microchip's PIC's are the neatest little devices since ready sliced bread and canned peanut butter!!!

I will see if I can locate that thread for you as it has several links you may find of use.

Here it is,


I just got a PIC clicker board and some thing like this could be easily done with it.
And you won't need a extra Programmer as it has a bootloader built in to it so that you can program it via USB cable.
You use MPLAB or MPLABX to write and compile your program and use the utility for it to upload your HEX file program to it!


It has a very nice 18F47J53 PIC mcu onboard,





Last edited by geraldfryjr; 12th March 2014 at 11:47 PM.
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Old 12th March 2014, 11:43 PM   #3
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

Just a question ... Have you ever played velocity sensitive foot pedals ?

Far more trouble than it is worth it seems to me.

FWIW for velocity senstivity AFAIK you add similar switches to the
bottom of the key to the top of the key and go on the time difference
for the velocity, piezo's on the bottom will give you aftertouch.

However I'd expect foot pedals to just go on break as soon
as as you move them and severely doubt they are correctly
weighted to be tactilely playable with velocity sensitivity.

rgds, sreten.
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