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资源说明：Code for a Cyan eCog1k to create a second kick pedal from a resistive input pedal.
# V-Drum MIDI Hi-Hat Drop Clutch / Double Kick Embedded code for an e-drum addon unit which converts a resistive-based V-Drum hi-hat pedal into a kick pedal, using a MIDI output. The interesting code is in midi-hh-clutch.c, the rest is support for the [Cyan Technologies](http://www.cyantechnology-ir.com/html/about/company_history.asp) eCog1k eval board I used as the brains of the project. ## Theory of operation * Take a stereo jack cable from the hi-hat pedal to the throws of a DPDT switch. * Wire one set of poles of the DPDT to the input of the V-Drum brain to provide normal HH open/close operation to the brain. * Wire the other set of poles to the eval board ADC input, creating a voltage divider out of the hi-hat pedal and another resistor. * Connect the MIDI out from the eval board to the V-Drum brain. * The ADC constantly samples the position of the pedal, and when the position crosses a certain threshold, a single MIDI note is triggered (kick down). * The note is not triggered again, until the pedal is raised above the threshold, and then depressed again. ## Improvements/TODOs * Adjust the midi-velocity out to be a function of pedal-down velocity (i.e. rate of change of resistance). * Do I need to run it at full speed? Like the MIDI pedal, my feet aren't that fast. * Replace the eCog1k eval board with something more appropriate, like an MSP430 or an AVR. ## References / Resources Sending MIDI messages is done simply by soldering some extra components onto the proper socket, and hooking that up to a serial driver and a 5v line. * [Sending MIDI from an Arduino][1] * [Wiring a MIDI interface][2] * [MIDI message reference][3] [1]: http://itp.nyu.edu/physcomp/Labs/MIDIOutput [2]: http://www.tigoe.net/pcomp/code/communication/midi/ [3]: http://www.cs.cf.ac.uk/Dave/Multimedia/node158.html#SECTION04133000000000000000
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