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About

This is the very-much-in-progress firmware for the M-Watch, specifically, the nRF52840 version. It uses zephyr / Nordic Connect SDK as base.

Code is not production quality obv, since this is my free time :p

Important: To those who want to use this as a base for their app, be warned that not only is the code not production quality, I also frequently push broken/wip code to master as I try new things. Code on master usually compiles but is not guaranteed to not have any major bugs.

SDK version used is nRF Connect SDK v1.5.1

Hardware

Visit the project page for an in-depth rundown of the hardware.

exploded view

  • nRF52840 bluetooth SoC
  • LIS3DH ultra low power accelerometer
  • 24 rgb leds: APA102, small variant
  • 3 pushbuttons for user interaction
  • vibration motor + driver
  • powered from 150mAh lipo battery + TI low-Iq DCDC
  • Custom watch case, compatible with standard quick-release straps, see-through/translucent led display
  • Pogo-pin charging + SWD debugging on the back

Features

  • Time display in BCD and digital formats
  • Date display
  • Shake wrist to wake display up (can be temporarily disabled)
  • Set the time using the accelerometer (fun!)
  • Basic stopwatch
  • Basic countdown timer (with fast restart)
  • Alarm with snoozing and weekday support
  • Bluetooth Current Time Service implementation
  • NCS FOTA (bluetooth fw upgrade)