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# E-ink word clock watch
{{Project
  |Name=E-ink wordclock watch
  |Omschrijving=E-ink wordclock watch
  |Status=In progress
  |Contact=jelly
  }}


This is a research page for my project to make a watch with an e-ink screen displaying word clock.
== Plan ==


Requirements:
The plan is to make an e-ink watch with a 1.54" display which will display a word clock of the current time which updates every ~ 3/5 minutes.
 
=== Requirements ===
* Refresh e-ink screen (ie. update word clock) every ~ 3 minutes
* Refresh e-ink screen (ie. update word clock) every ~ 3 minutes
* Be able to set the time or sync it via WiFi/Radio?
* Be able to set the time or sync it via WiFi/Radio?
* Capable or running for > one month
* Capable of running for > one month


Interfaces:
=== Interfaces ===
* SPI
* SPI
* Serial for debugging / flashing?
* Serial for debugging / flashing?
* RTC


Parts:
=== Parts ===


* [https://www.waveshare.com/1.54inch-e-paper.htm e-eink module]
* [https://www.waveshare.com/1.54inch-e-paper.htm e-eink screen] [https://www.waveshare.com/w/upload/7/77/1.54inch_e-Paper_Datasheet.pdf datasheet] [https://www.unisystem-displays.com/en/fileuploader/download/download/?d=0&file=custom%2Fupload%2Ffile%2Fc70036746e01f55cd5bc6c7d14c8c34b%2FHINK-E0154A05_spec%C2%A05.11.pdf datasheet] Requiring 3.3 V, SPI and has refresh power req. of 26.4 mW with standby power of < 0.0 17 mW (0.0264/3.3 = 8mA)
* Coin cell** / lithium battery small enough? (if powerful enough)
* Coin cell (3V ~ 225 mAh / lithium battery small enough? (if powerful enough) 3.7 V 180 mAh 502025 Lithium Polymeer Li-Po  should fit under the display, but might be too big.
*
*
=== MCU ===
* atmega 328P 320 uA "active mode", 200 nA power down and 1.3 uA power save.
* stm8s
* [https://docs.espressif.com/projects/esp-idf/en/latest/get-started/get-started-pico-kit.html esp32 pico] 150-10 uA
=== Hardware ===
* Display size (e-ink) 31.8mm × 37.32mm × 1.05mm
* PCB
* 3d printed case
* arm strap?
* I2C RTC chip
=== Prototyping ===
Use a e-ink breakout board with the preferred $MCU to display a simple "hello world" text every three minutes and measure the power usage.
=== Studying material ===
* [https://www.youtube.com/user/contextualelectronic/playlists Kicad]
* [https://www.youtube.com/watch?v=35YuILUlfGs pcb design]

Latest revision as of 18:40, 15 April 2019

Project E-ink wordclock watch
E-ink wordclock watch
Status In progress
Contact jelly
Last Update 2019-04-15

Plan

The plan is to make an e-ink watch with a 1.54" display which will display a word clock of the current time which updates every ~ 3/5 minutes.

Requirements

  • Refresh e-ink screen (ie. update word clock) every ~ 3 minutes
  • Be able to set the time or sync it via WiFi/Radio?
  • Capable of running for > one month

Interfaces

  • SPI
  • Serial for debugging / flashing?
  • RTC

Parts

  • e-eink screen datasheet datasheet Requiring 3.3 V, SPI and has refresh power req. of 26.4 mW with standby power of < 0.0 17 mW (0.0264/3.3 = 8mA)
  • Coin cell (3V ~ 225 mAh / lithium battery small enough? (if powerful enough) 3.7 V 180 mAh 502025 Lithium Polymeer Li-Po should fit under the display, but might be too big.

MCU

  • atmega 328P 320 uA "active mode", 200 nA power down and 1.3 uA power save.
  • stm8s
  • esp32 pico 150-10 uA

Hardware

  • Display size (e-ink) 31.8mm × 37.32mm × 1.05mm
  • PCB
  • 3d printed case
  • arm strap?
  • I2C RTC chip

Prototyping

Use a e-ink breakout board with the preferred $MCU to display a simple "hello world" text every three minutes and measure the power usage.

Studying material

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