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 Forum index » DIY Hardware and Software » Developers' Corner
Drum Triggers To Computer
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nsnyder



Joined: Dec 31, 2006
Posts: 2
Location: USA

PostPosted: Sun Dec 31, 2006 1:05 am    Post subject: Drum Triggers To Computer
Subject description: MIDI/Reaktor/Reason
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Hey All,
I'm looking to do something like this:
http://www.youtube.com/watch?v=3rGOumtn-qg

I have 20 piezo sensors. I'm going to make a cross section of some foam rubber and glue the senor to sheet metal...then put the sheet metal in the middle and glue the foam rubber back together.

My questions are:

1) What cord do I need to have coming out of each trigger? At the end of each sensor is a ground(black) and active(red) wire.

2) How can I convert that signal in Reaktor/Reason to equal the sound of the drum getting struck?

3) Can I have all the drum triggers (all 20 of them) come together in a single cord that goes into my computer and have them recognized seperately? [I'm pretty sure the answer to this is no...but not positive]

I'm glad for the help,

Nick
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deknow



Joined: Sep 15, 2004
Posts: 1307
Location: Leominster, MA (USA)
G2 patch files: 15

PostPosted: Sun Dec 31, 2006 10:33 am    Post subject: Reply with quote  Mark this post and the followings unread

...you will need some kind of trigger to midi interface to make this work. there are lots of options...several of the drum modules have them, and there are standalone options as well. try a google search on "trigger to midi".

deknow
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nsnyder



Joined: Dec 31, 2006
Posts: 2
Location: USA

PostPosted: Sun Dec 31, 2006 11:36 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks...i was hoping I wouldn't have to use a drum module. Putting my DIY nature aside...I'm a broke college student haha. Alright thanks.

NKS
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deknow



Joined: Sep 15, 2004
Posts: 1307
Location: Leominster, MA (USA)
G2 patch files: 15

PostPosted: Sun Dec 31, 2006 12:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

...there are diy options (although all include running a microprocessor of some kind), and also older devices. the casio dz1 will do it, and there is a current roland product as well:
http://emusician.com/hardware/emusic_roland/

deknow
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algorhythm



Joined: Feb 22, 2005
Posts: 46
Location: Shoreline, WA

PostPosted: Wed Feb 07, 2007 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

You could wire up to 8 piezos to a PIC controller as a MIDI out.
http://www.audiomulch.com/midipic/
This drum kit is an extreme example:
http://www.edrum.info/
8 piezos to midi using an 8051:
http://www.pjrc.com/tech/midi-drums/

Using piezos to trigger an analog drum synth:
http://www.electronicpeasant.com/projects/ssdrums/ssdrums.html
But that won't get it into the computer.

Last edited by algorhythm on Wed Feb 07, 2007 4:24 pm; edited 1 time in total
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madhatter



Joined: Apr 16, 2005
Posts: 18
Location: Lincoln, UK
Audio files: 1

PostPosted: Wed Aug 22, 2007 8:40 am    Post subject: Reply with quote  Mark this post and the followings unread

The way I've built mine was centered around some cheapy trigger-midi interface that I picked up for £40, then solder the ends of the piezo transducers onto cables as long as you like, then onto 3.5mm headphone connectors (in my case) mono, which you can then connect to the trigger-midi box.

Hey presto, velocity sensitive pads.

So the answer is, YES. You can have it all coming through one cable (if you use USB, or MIDI) but you can't just stick the piezo wires straight into your PC, you need an interface in between.

Hope that helps.

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Sam_Zen



Joined: Mar 08, 2008
Posts: 251
Location: NL

PostPosted: Mon Apr 28, 2008 8:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

PC's always have been designed quite poorly concerning communication with input signals for a direct triggering.
Apart from keyboard or mouse. So a hardware interface is quite inevitable.
But that interface often will need extra software to function properly.

I once made a system to start the PC playing a soundfile, from another room as the PC, by modding the mouse,
by bridging the left-button contacts with a relay.
First I had to position the mouse in the app above the play-button.
The relay was controlled by the chain :
Any tv-remote
Infrared detector
Increased pulse-length after a trigger, so the 'command' string becomes one single pulse.
Shorten the pulse-length again to create the proper mouse-click so close the relay.

The way of using hardware ports for communication has been changed.
Web-traffic via e.g. a LAN-card, not via the serial connector any more.
Printers can be USB connected, so the parallel port is left.

Technically seen, this provides many new free communication lines.
Suppose the drum hardware is connected to the parallel port and triggers bit 3 of the data-byte, meaning a PC command to play sample 3.
The routines behind this would not be that complicated I suppose.

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