This adapter board to connects a USB-to-serial cable to the 2018 Open Hardware Summit badge.

The badge features an ESP32 microcontroller running MicroPython firmware.  The firmware provides a Python interpreter prompt (REPL) on the serial port which allows interactive programming of the badge!

A previous blog post describes how to build and flash new MicroPython firmware to the badge:

 

The KiCad design files are shared on GitHub:

oshwabadge2018/adapter-board

The board has been shared on OSH Park:

OSH Park: adapter board for USB-to-serial cable

Bill of Materials (BoM)

• Switch for programming mode
  • E-Switch EG1218
  • Slide Switch SPDT
  • Digi-Key: EG1903-ND
• Pushbutton for reset
  • Omron B3F-1000
  • Tactile Switch SPST-NO
  • Digi-Key: SW400-ND
• Header for FTDI usb-to-serial cable
  • TE AMP 9-146282-0-06
  • 1×6 Pin Header 0.1″ pitch
  • Digi-Key: A34253-06-ND
• Header to connect J1 socket on badge
  • Harwin M20-9720345
  • 2×3 Pin Header 0.1″ pitch
  • Digi-Key: 952-1921-ND
• J1 header socket on the badge
  • Harwin 952-1781-ND
  • 2×3 Header Socket 0.1″ pitch
  • Digi-Key: M20-7830346

Digi-Key shopping cart

Resources:

• Try loading MicroPython apps using the FTP server feature:
  • Magic 8-Ball
  • Accelerometer demo
• Learn how to build and flash new MicroPython firmware
• Join the project on Hackaday.io if you are interested in participating in the development