Mico is a small, cheap (~10 euros total) and super precise 14 bit midi controller based on the Raspberry Pi Pico board.

• 4 x detentless (smooth) encoders
• Velocity: Slow movements result in microscopic changes (1/16000 of the max range approximately), fast movements in large changes.
• A variety of "clip modes" (cycle through them by pressing the button):
  • wrap (when the value goes above max, it wraps back to 0)
  • clamp (clip at min and max value)
• 14 bit midi (as well as regular 7 bit midi)
• Cheap as chips and open sourced

There's a demo here.

Download the latest firmware from the release and locate the mico.uf2 file. While plugging your Pico into your computer, press and hold the "BOOTSEL" button. It will show up as a storage device on your computer. Copy mico.uf2 to this device. Done.

If you want to build the code and mess around with it, it is recommended to use a second Pico flashed with the picoprobe firmware.

cd software
mkdir build
cd build 
cmake ..
make && openocd -f interface/picoprobe.cfg -f target/rp2040.cfg -c "program mico.elf verify reset exit"

Debug:

openocd -f interface/picoprobe.cfg -f target/rp2040.cfg -s tcl

There is an easy to use interface for this controller here.

This work is shared under the Attribution-NonCommercial-ShareAlike 4.0 International license.

If you have questions about that, send me an email mail at madskjeldgaard.dk

These projects were a big help and inspiration in making this:

• schatzmann blog and also this post
• pico-example-midi
• encoder-pio is from the pimoroni-pico library. MIT Licensed.