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This instructable Making a Continuous type MIDI controller / Keyboard is explained. A very simple concept of capacitive sensing is used along with MIDI communication and sound synthesizer software. You may refer Attached video for a quick demonstration or you may refer half-hour-long video to have a detailed understanding of working.

Video on working details:

Arduino Mega
Aluminum Foil
500 kOhm resistor: 48x
Header pins for Arduino
Soldering Kit”

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