DragonMaster Posted December 15, 2007 Report Share Posted December 15, 2007 Hi all, someone on the French forums needs to build a MIDI keyboard using 108 keys with velocity. So far, it looks like SPDT switches will be used. What would be the best way to connect this to a MIDIbox?There's this way : http://www.midibox.org/forum/index.php?topic=5835.0but it only supports 63 notes. (Two cores, eight DINX4s and a LOT of wire...)I thought about using a matrix, but there's nothing so far with velocity support and I wonder if the keys would be scanned fast enough. So far it looks like the keyboard will just have a power input, keys and a MIDI output. Any ideas? Quote Link to comment Share on other sites More sharing options...
Durisian Posted December 16, 2007 Report Share Posted December 16, 2007 QBAS made a velocity sensitive scan matrix for a keyboard....http://www.midibox.org/forum/index.php?topic=6386.15The 16x16 matrix is big enough, but I think he only made 12x11 as velocity sensitive.Would be a good starting point if you can program in asm. Quote Link to comment Share on other sites More sharing options...
DragonMaster Posted December 16, 2007 Author Report Share Posted December 16, 2007 if you can program in asm.Nope, only TRS-80 Color Basic, DOS batch and once modded a program made in Tcl/Tk.I've never got to build my Microchip ICD2 clone to start learning ASM... I have all the parts, but my LaserJet IIP printer died last year (I bought a new scanner motor last week, should be getting it soon! -with COD brokerage fees... >:()I don't think I'll learn ASM for someone else if I have other priorities during the next month(Off school from Dec 21st to Jan 21st) :1. Buy and program Flash ROMs for my Kawai K4r V1.4 / K4m V1.4 / K5 V1.3 / K5m V1.2 firmware upgrade group order.2. Buy 8x 6582 reserved SIDs from Wilba.3. Fix the #!$@;* sump pump check valve.4. Fix the noisy ADC stage in my Fostex DAT deck I bought 1-2 months ago.5. Fix my laser printer and start to build some PCBs for projects on standby.... (+ two mono tube amps to restore, my Gainclone to get working properly, finish the speakers I started to build in 2004, repairing two amps with little-annoying problems, get an analog oscilloscope-> align three cassette decks and a few tuners, etc.) ... then if everything goes well, in a few years I'll build the ICD2 and start working on MIDIboxes... -> That's going to be in years! (In the mean time, I get some parts while they're still available) Quote Link to comment Share on other sites More sharing options...
QBAS Posted December 16, 2007 Report Share Posted December 16, 2007 SPDT switches are different than this one used in standard keyboard, so code that I use is not compatible. Quote Link to comment Share on other sites More sharing options...
DragonMaster Posted December 16, 2007 Author Report Share Posted December 16, 2007 SPDT switches are different than this one used in standard keyboard, so code that I use is not compatible.I see... The person might build a Off-(On1)-(On2) switch system though, that would be closer to a usual keyboard.Still... not sure of which switch type will be used, so there are a few steps to do before thinking about software and MIDIbox hardware... Quote Link to comment Share on other sites More sharing options...
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