unidex v1.1

Upgrades since v1.0:

Settings menu (hold A on the home screen)

• Date & time: set the clock by hand, no WiFi or Mac needed (London time, summer time automatic)
• Sleep: stay awake 10 / 20 / 30 / 60 s after the last press
• Invert: white-on-black mode for every screen
• Battery & info: battery voltage and %, firmware version, storage used, last Mac sync
• Reset data: clear the Chooser tally, Dex, calendar events, or everything (each with a confirm)

Home screen

• Time and battery % in the header, with a lightning bolt on USB power

Battery

• Calibrated reading: the ADC read about 2% low, so a full battery now shows 100% instead of 85%
• Resting LiPo curve, 100% from 4.15 V
• On battery the % only goes down, so it no longer bounces between screens

Flashing

• pio run -t upload works again: 115200 baud and esptool's ROM loader for firmware
  (tools/upload_nostub.py), avoiding the "No serial data received" drop on this board