PedalinoMini™

Open source wireless MIDI foot controller for guitarists and more.

Plug-and-play with any MIDI-compatible app on iOS 8 and above as well as OS X Yosemite and above.
High customizable using iOS or Android app
Bluetooth and WiFI MIDI interface
No extra drivers to connect Windows, macOS, iOS (iPad/iPhone) and Android
Bluetooth LE MIDI (iOS and macOS compatible)
Network MIDI (aka AppleMIDI or RTP-MIDI)
ipMIDI
Open Sound Control (OSC)
IEEE 802.11 b/g/n Wi-Fi 2.4 GHZ with WPA/WPA2 authentication
Bluetooth Low Energy 4.0
MIDI routing
MIDI clock master and slave
MIDI Time Code (MTC) master and slave
OSC to MIDI and vicecersa
Any number of pedals of any type in any order
Auto-sensing footswitches and expression pedals

Features

Support for digital foot switches (momentary or latch), analog expression pedals and jog wheels (rotary encoders)
10 banks of 6 controllers each
3 user configuration profiles
Each port can connect 1 expression pedal or up to 3 foot switches for a maximum of 18 foot switches.
MIDI output via AppleMIDI (also known as RTP-MIDI) or ipMIDI via Wi-Fi
Send the following MIDI events: Program Change, Control Code, Note On/Off or Pitch Bend
MIDI channel, MIDI note, MIDI control code, MIDI program change can be configured by each pedal and by each bank
Switch debouncing and analog noise suppression without decreasing responsiveness
Invert polarity via software
Individual automatic calibration of expression pedals. Manual fine tuning is not usually requested.
Transform a linear expression pedal into log expression pedal and vice versa
Responsive and mobile-first configuration web interface (http://pedalino.local)
Smart Config technology to help users connect to a Wi-Fi network through simple app on a smartphone.
Firmware update via HTTP (http://pedalino.local/update)

The app made with Blynk is on the way.

The shortest bill of materials ever: an ESP32 board and a OLED display. That's it.

Any ESP32 board supported by Arduino core for ESP32 WiFi chip
- Tested on DOIT ESP32 DevKit V1 4M dual-mode Wi-Fi and Bluetooth module
OLED I2C 0.96"/1.3" display 128x64 pixels SSD1306/SH1106 based

Not enough short?

An all-in-one TTGO T-Eight ESP32 with a bigger OLED display (1.3"), 4MB PSRAM and lithium battery interface

The breadboard shows the connection (4 wires only) between the ESP32 board and the OLED display. Momentary switches are just an example.

Home screen	Device info	MIDI message

MIDI Clock	MIDI Time Code