A cheap chinese dual arc lighter, modified with a custom PCB and the power of an STM32F072 to play music with the arcs.

Follow the Twitter Build Thread for the newest developments and videos of the lighter in action.

The project has developed into a playground for implementing various USB features and modifying the default STM USB libraries way beyond what they were meant for*.

The features include:

• USB composite device
  • USB MIDI for direct control of the
  • USB MSC (mass storage) to appear as a drive on a PC for dragging MIDI files onto the SPI flash.
  • USB CDC (serial port) for debugging and log messages
• 5-pin DIN MIDI input via adapter**
• Standalone MIDI playback
• SPI flash for storing MIDIs
• Single button user interface
• Battery charging and monitoring

* If I find the time and motivation I'll write an in-depth tutorial about the modifications.
** Adapter from 5-pin DIN plug to micro USB, optocoupler in the DIN plug, single-ended MIDI signal over the micro USB ID pin. Details will be shared at a later date.