Midi controllers with knobs,buttons,sliders,encoders,leds,lcd displays…
Teensy Midi info: https://www.pjrc.com/teensy/td_midi.html
https://www.tindie.com/products/xiwi/2x-kit-modi-controller-series/
http://brendanbyrne.info/Hybri-Assembly-Instructions
Uses 4051 Multiplexer IC to to read 8 analog inputs into 1 pin on uC. 8×8 = 64 inputs
http://digitalwarrior.co/stuff-files/midi_elements_docs/index.html
https://github.com/ghztomash/digitalwarrior
https://www.pjrc.com/teensy/td_libs_Encoder.html
Circular LED Bargraphs &
https://www.sparkfun.com/products/10595
https://www.sparkfun.com/products/11040
SparkFun LED RingCoder Breakout – RGB
demo code haven’t try yet:
https://github.com/bettse/arduino_projects/tree/master/libraries/RingCoder