Am Mon, 9 Nov 2009 19:56:31 +1300 schrieb Bernard Mentink <[email protected]>:
> Hi Guys, > > To go with Hydrogen I am developing an open hardware project of a > trigger->usb module that appears as a midi device > to Hydrogen. I am aiming the cost build to be <$50. > > My aim is to provide 12 trigger inputs (from a piezo sensor) and several > switch inputs (for close/open high hat switch and jazz/rock snare selection > .. and probably some others) > > So far I have my hardware enumerated correctly as a midi/audio device and I > can send midi events to Hydrogen ... so the usb midi > stack is working. > > Next, is to do A2D work of scanning all trigger inputs, setting thresholds, > measuring the volume of the hit, and sending messages back to the midi > interface. > > I believe there are others on the list that have done similar things. I > am wondering if anyone has experience with the signal-processing side of > reliably detecting a "hit" and measuring the peak/avg to generate the volume > parameter. Any help most appreciated. I though maybe of differentiating the > signal to get the trigger and integrating to get the volume ... any one have > some algorithms? > > Many Thanks, > Bernie suuuuuuuuper, is there a project description available (circuits, controller firmware and and) i just solder the edrum project bord. it use a PIC16F84 and can handle maximal 24 piezo trigger. to handle more than 8 analog inputs you need a second and a third 4051 multiplexer. but it cant talk to usb. it have only one MIDI out and one serial RS-232 out. usb is great. last year we try to get an avr working to send midi over usb. but we cancel the project because it become to expensive. greetings wolke ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Hydrogen-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/hydrogen-devel
