[sdiy] MIDI velocity

Richie Burnett rburnett at richieburnett.co.uk
Wed Apr 6 18:43:54 CEST 2016

Thanks for the link Tom.  I'm not familiar with "Vertical Counters".  How 
easy do you think it would be to increase the de-bounce count to say 16 
consecutive identical "bounce-free" reads before the output states are 
updated?  The example he gives seems to work well with just a 2-bit count, 
but I'm not sure how it would work for counting up to larger numbers for a 
longer de-bouncing time.


-----Original Message----- 
From: Tom Wiltshire
Sent: Wednesday, April 06, 2016 4:23 PM
To: Richie Burnett
Cc: synth-diy at dropmix.xs4all.nl ; Roman Sowa
Subject: Re: [sdiy] MIDI velocity

I've always used Scott Dattalo's vertical counter method. The counter has to 
count four switch reads identical before it regards the switch as changed. 
How fast that is depends on hw fast you scan the switches, obviously. I've 
used it on keyboard keys, rotary encoder contacts, pushbuttons, 
footswitches, you name it.

Unfortunately, Scott's excellent webpage is no more. However, through the 
magic of technology…


This method is so clever I just *had* to use it! It's even better on a 
dsPIC, where you can simultaneously debounce 16 inputs on a single port with 
only a handful of instructions. I usually finish up with two registers 
"SWITCH_CHANGES" and "SWITCH_STATES", which makes testing for various input 
conditions very easy.


On 6 Apr 2016, at 11:45, Richie Burnett <rburnett at richieburnett.co.uk> 

> Out of interest, what rule do you use for the de-bouncing of musical 
> instrument keys?

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