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
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