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

Some exceptional bluetooth MIDI keyboard controllers, such as:

• CME Xkey Air
• Roli Seaboard Block
• Roli Lumi

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.

• Pedal polarity auto detection.
• Power/Bluetooth and Pedal-On LED indicators.
• Powered by micro USB cable, 5W.

User Guide

The housing is utilized micro screwdriver tool box.

• ESP-WROOM-32 DevKit V1 or similar
• LED diodes (2x)
• Resistors 1kOhm (3x)
• Wires (6x)
• Female jack 6.5mm
• Breadboard
• Suitable housing

• Arduino IDE
• Arduino-BLE-MIDI library

• ESP32 USB driver installation
• On slow ESP32 compilation in Arduino IDE (mid 2021)

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.