Diagram Inputs Piezo buzzers in the palm detect ball catches. The variable voltage from the piezo triggers is converted to MIDI note-on commands with variable velocity. The conversion is performed by a PAVO MidiTools MIDI Computer, with detection circuitry and firmware developed by Steve Macatee and Bob Moses.
Variable resistors measure arm movement at the elbow.
Battey designed a mechanical interface that suspends the potentiometer in the elbow while providing for ease and flexibility of movement. Special thanks to the inventors of velcro and hot glue. A PAVO MidiTools MIDI Computer performs the conversion of the variable resistance to MIDI continuous controller messages. Steve Macatee developed the firmware and hardware for this conversion. The eight vending buttons and the Mars Electronics International bill and coin mechanism utilize a Mars Electronics International logic board to control availability of selections based on the amount of money that has been entered.