I used a WEMOS ESP32 board that has a 18650 battery holder and the charger circuit included so the build it's really just attaching buttons and fit it in a suitable case. 

But then I also made some Push Push Air without battery (powered via the usual USB calble) with a classic ESP32 dev bpoard.

Any EXP32 developement board shuld be ok to run the Push Push Air code.

Device Customization

By default the pedals/buttons are connected to Pins 21 and 23, and the only led used is LED_BUILTIN, however you can customize this.

The PIN and LED assignement is done in a separate file, named customize.h

See the GitHub repository Readme for details on how to customize that file.

Compiling the firmware

If you are using the same board with integrated battery that I used, in Arduino IDE select the WeMos WiFI&Bluethooth Battery

Otherwise select the board you are using

As Partition Scheme select: Huge APP (3MB No OTA/1MB SPIFF)

Please install the following libraries:

BleKeyboard 0.3.2beta

• Bounce2
• Preferences
• Pangodream_18650_CL