WORK IN PROGRESS NOTES

- Wrist form factor like Chaos Camp watch?

https://firmware.card10.badge.events.ccc.de/index.html

- SparkFun Artemis... software support not ready?  talk to Owen?

- lessons learned: must have USB

  - use a usb-to-serial? 

   - CP2102 https://www.digikey.com/product-detail/en/silicon-labs/CP2102-GMR/336-1160-1-ND/3672615

- discussion with Nate and Michael and Drew:

  - wristwatch with sparkfun artemis

  - GPS, vibration motor, small IPS LCD 

- supercon meeting

   - maybe not use artemis

   - wireless uC ideas: ESP32, Rigado... Nordic NRF52840

    - do we really need wireless?  if not, then STM32 or SAMD

    - Nordic NRF52840 is well supported by adafruit

- GPS useful?  not really since indoors... BLE beacons might be more practicle

- Idea: reuse the card10 design

- note: here is a way to use stock wristband watch stuff

https://www.youtube.com/watch?v=Uib8nUV1JEg&feature=youtu.be&t=2010

- wristband from sparkfun: https://www.sparkfun.com/products/11734

MUST HAVE:

- USB programmable (either builtin or usb-to-serial)

- Accel/IMU  6DoF of 3DoF

If throw on a 6dof e-compass we can get the magnetometer too: https://www.digikey.com/product-detail/en/stmicroelectronics/LSM303AGRTR/497-16527-1-ND/6006105

- Arduino library compatible

- Display LCD or OLED - source from Digi Key?  if from China, remember Chinese New Year

... or e-paper (Pervasive Display on DigiKey)

... flexible epaper?

- note: DOOM guy SAO has: High DPI ST7789 1.3" 240x240 LCD Screen

https://hackaday.io/project/164346-andxor-dc27-badge/log/165849-dc27-doom-sao-hurt-me-plenty

-  ST7789 1.3" 240x240 LCD  possible on DigiKey?

- V1.69bis standard SAO connector (have them on the wristband -- use flex?)

- POWER? 

   - LiPo from Sparkfun

    - note: card10 has 200mAh 

NICE TO HAVE:

- MicroPython or CircuitPython

   - note: Python may drain power on the NRF52840 (ask tannewt)

- BLE that works

SUMMARY: Nordic 82540 might be the best choice

There is a module from Rigado that Andy Sowa has used:

https://www.digikey.com/product-detail/en/u-blox-america-inc/BMD-340-A-R-00/672-BMD-340-A-R-00CT-ND/8638940

SOURCING CONCERNS:

- LCD 240x240

- Vibration motor

- watch strap / mount