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OpenDeck MIDI Platform

OpenDeck is a platform for building MIDI controllers. It is a firmware running on various boards which transforms them into class-compliant USB MIDI devices, making them compatible with any MIDI software on any operating system. OpenDeck is designed to solve two problems when building a MIDI controller:

  • Coding - there is no need to code anything in order to make changes to the controller or to make it work
  • Making the controller behave the way you want it to - the firmware supports huge number of configurable parameters, all configurable in a Web browser

Solving this two goals means you can forget about implementation details and focus on having your custom controller built as fast as possible.

Click the image below for a demo video of the OpenDeck configurator

Watch the video

Configurator is available either online or offline.

Some of the controllers built with OpenDeck


The following components are supported:

  • Buttons
  • Encoders
  • LEDs (single color or RGB)
  • Potentiometers
  • FSRs (force-sensitive resistors)
  • LCD/OLED displays
  • Touchscreen displays (Nextion and Viewtech/Stone)

OpenDeck supports sending of both 7-bit and 14-bit Non-Registered Part Numbers (NRPN), latching messages on buttons, various encoding modes for quadrature encoders, LED control using MIDI In, configurable MIDI channels for each component individually, Bluetooth MIDI etc. Full list of supported features can be found here.

If the feature you want isn't supported yet, don't feel discouraged. Open up a discussion thread and let's talk about it.

Official boards

Currently, there are two official boards: M and L variants. "M" stands for "middle" and "L" for "large". Both boards are available on Tindie store.

M board

This board is based on Raspberry Pi RP2040 microcontroller and features the following:

  • 64 digital inputs
  • 48 digital outputs
  • 32 analog inputs
  • Connector for touchscreen
  • Connector for I2C OLED display

The board is available on Tindie.

L board

This board is based on Raspberry Pi RP2040 microcontroller and features the following:

  • 128 digital inputs
  • 64 digital outputs
  • 64 analog inputs
  • Connector for touchscreen
  • Connector for I2C OLED display
  • Additional connectors with 3V+GND and 5V+GND connections

The board is available on Tindie.

Supported boards

The firmware supports various other boards, both small and large:

[1] WeAct (developer of Black Pill boards) currently sells Black Pill board with AT32F403ACGU7 MCU instead of STM32F411. This variant isn't supported!

Some of the supported boards

For more details on supported boards, check the dedicated wiki page. A page with instructions on how to flash OpenDeck firmware to supported boards is also available. Support for custom boards can be easily added using YAML descriptors.


Available on dedicated Wiki section.


Need help? Want to show off your OpenDeck based builds? Head over to Discussions!



Most of the code is available under Apache Licence v2.0, with the following exceptions:

  • modules:
    • avr-libstdcpp: GNU GPL v3 or later with GCC Runtime Library Exception 3.1
    • core: MIT
    • dbms: MIT
    • EmuEEPROM: MIT
    • lufa: Modified MIT, see modules/core/modules/lufa/LUFA/Licence.txt for details
    • midi: MIT
    • sysex: MIT
    • u8g2: Two-clause BSD
    • unity: MIT
    • tinyusb: MIT, but many modules it uses are individually licenced, check for more details