I got the Eventide H9 for almost a year and i just love the pedal. Except that it just doesn't have enough buttons :-) Preset switching is a pain in the %$#, especially if you also want to tap tempo, adjust volume, use the 'hotknob' as a pedal and use the 'performance' button as well. I know that this is specifically for the H9, but I can imagine you can have the same feeling as well for other gear.
The foot controller has 2 expression pedal inputs and 8 momentary buttons and was made using an Arduino Uno.
Page Up, Page Down, Tuner, Mode
Preset 1, Preset 2, Preset 3, Preset 4
Looper mode (didn't use this in the video):
Direction switch, Octave switch, Tuner, Mode
Record, Play, Stop, Empty
Source code on github:
To build this thing you need...
8 momentary footswitch buttons "SPST Momentary Soft Touch Push Button Stomp Foot Pedal Electric Guitar Switch"
8 LED thingy "WS2812 5050 RGB Built-in LED 8 Colorful LED Module for Arduino Dropshipping"
An Arduino UNO
2 stereo female jack plugs
a female midi jack + 220 Ohm resistor
pin headers: you solder the wire on the pin header, then connect it into the arduino
- wires, soldering iron
Anything unclear? Ask! (I'm not very good at detailed descriptions)