Epaper watch

looking to make a simple basic epaper watch with emphasis on low-power, low maintenance, and high hardiness.

unset

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Description

MCU: STM32L432KC
Epaper screen: GDEY0154D67 (good display 1.54" 200x200 pixel square display, inflexible)
RTC: RV3028

Currently aiming to make just a basic watch. Potentially more features later:

- solar power via thin solar cells sheets
- mesh node?
- night mode to light it up (using a red LED to avoid melatonin disruption at night)

Files

watch-kicad.kicad_sch

initial usb power prototype

x-kicad-schematic - 46.80 kB - 07/21/2026 at 07:07

Download

Components

1 × STM32L432KC
1 × GDEY0154D67 1.54" 200x200 pixel epaper display from Good display
1 × RV3028 low power RTC

Project Logs

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Reading from RV3028 via I2C
unset • 07/11/2026 at 06:50 • 0 comments

now to think of battery/power setup, trying to think of how to incorporate solar cells potentially in the future
Have outputted LSE reading to the epaper screen
unset • 06/11/2026 at 06:40 • 0 comments

I'm realizing that manually setting the base time through the STM32CubeMX ioc file isn't ideal, this is where the free samples of the RV3028 from microcrystal will come in handy