KontrolFreak DIY MIDI keyboard

[EDIT] I made a new version of the capacitive keyboard, with 32 keys and a bunch of cool options. Watch the video here:    • Capacitive DIY keyboard with lots of optio...   [EDIT]: The Kontrol Freak series continues during the viral cuarantine in 2020. Join me as I make MIDI controllers under lockdown, starting here:    • Kontrol Freak S3 - Kuarantine Kontrollers   In "Kontrol Freak" I make a new MIDI controller in every video, then play it for a bit and record some music. This time it's a monophonic MIDI keyboard, capacitive and touch sensitive, , made from a cardboard box, copper tape and some recycled components, including a Teensy 3.2 and a multiplexer. See how I turn this keyboard into a MIDI melodica by incorporating a DIY breath sensor, in this video:    • KontrolFreak DIY MIDI Melodica