Making MIDI hi-hat controller from unused bass drum pedal
A tidy little project from HWMayer that converted a standard Bass drum pedal into a controller for the Alesis interface. Most of the mechanical bits came from pedal itself, while the electronics is nothing more than a variable resistor, some wire and a connector. For regular live use you could enclose the whole thing in a die-cast box, held in place by the aluminum plate used here, and use a standard 1/4" Jack. Go to the original article for full details.