https://github.com/tomaskraus/ble-sustain-pedal

Bluetooth MIDI sustain pedal adapter. Any sustain pedal with 6.5mm jack can plug into.
https://github.com/tomaskraus/ble-sustain-pedal

arduino ble bluetooth controller esp32 lumi midi pedal seaboard sustain xkey

Last synced: 13 days ago
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Bluetooth MIDI sustain pedal adapter. Any sustain pedal with 6.5mm jack can plug into.

• Host: GitHub
• URL: https://github.com/tomaskraus/ble-sustain-pedal
• Owner: tomaskraus
• License: mit
• Created: 2021-07-22T22:32:38.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2021-07-27T22:38:37.000Z (over 3 years ago)
• Last Synced: 2024-04-18T03:18:04.188Z (8 months ago)
• Topics: arduino, ble, bluetooth, controller, esp32, lumi, midi, pedal, seaboard, sustain, xkey
• Language: C++
• Homepage:
• Size: 493 KB
• Stars: 0
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# BLE-sustain-pedal

Bluetooth MIDI sustain pedal adapter. Any sustain pedal with 6.5mm jack can plug into.

## Why to use

Some exceptional bluetooth MIDI keyboard controllers, such as:

- [CME Xkey Air](https://xkeyair.com/xkey-air/)

- [Roli Seaboard Block](https://roli.com/products/blocks/seaboard-block-studio-edition)

- [Roli Lumi](https://roli.com/products/blocks/lumi-keys-studio-edition)

lack dedicated sustain pedal port.

To solve this issue, plug any 6.5mm jack sustain pedal to the BLE-sustain-pedal adapter instead. It periodically checks pedal on/off status and sends appropriate sustain pedal MIDI message via its bluetooth connection.

## Features

- Pedal polarity auto detection.

- Power/Bluetooth and Pedal-On LED indicators.

- Powered by micro USB cable, 5W.

[User Guide](#ble-sustain-pedal-user-guide)

---

## How it works

![setup](./docs/pics/setup.jpg)

## Real device picture

![device picture](./docs/pics/real-image.jpg)

The housing is utilized micro screwdriver tool box.

## Inside the box

![device picture](./docs/pics/real-scheme.jpg)

## Hardware list

- [ESP-WROOM-32 DevKit V1][ESP] or similar

- LED diodes (2x)

- Resistors 1kOhm (3x)

- Wires (6x)

- Female jack 6.5mm

- [Breadboard](https://en.wikipedia.org/wiki/Breadboard)

- Suitable housing

## Software

- [Arduino IDE](https://www.arduino.cc/en/software)

- [Arduino-BLE-MIDI](https://github.com/lathoub/Arduino-BLE-MIDI) library

## Useful links

- [ESP32 USB driver installation](https://techexplorations.com/guides/esp32/begin/cp21xxx/)

- [On slow ESP32 compilation in Arduino IDE (mid 2021)](https://arduino.stackexchange.com/questions/8559/compiling-is-slow)

[ESP]: https://www.espressif.com/en/products/modules/esp32

---

## BLE-sustain-pedal User Guide

1. Plug a sustain pedal to the 6.5mm connector of BLE-sustain-pedal device.

2. Power the BLE-sustain-pedal on by attaching the micro USB cable connected to a power bank or wall adaptor.

3. The pairing LED starts blinking, waiting to be connected. In the bluetooth device list, BLE-midi-pedal has a rather generic bluetooth id, such as `4F41CA98-0...`. Pair it in your tablet or other device.

4. After BLE-sustain-pedal is connected successfuly, Pairing LED lights continuosly.

5. The BLE-sustain-pedal device is ready. A pedal status LED lights whenever the attached sustain pedal is pressed.

__Notes__:

- By default, BLE-sustain-pedal sends pedal message on MIDI channel 1.

- While BT pairing is in progress, be sure the sustain pedal is both attached and not pressed, so the pedal polarity is recognized properly.

- Only switch mode pedal is supported. Continuous pedals may not work with BLE-sustain-pedal.

- if the pairing LED is not blinking after power on, unplug the micro USB cable and attach the cable again.