Eink-word-clock-watch: Difference between revisions

From RevSpace
Jump to navigation Jump to search
No edit summary
Line 15: Line 15:


* [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] 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)
* [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] 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)
*
*


=== Prototyping ===
=== 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.
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.

Revision as of 21:26, 13 April 2019

E-ink word clock watch

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

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 or running for > one month

Interfaces

  • SPI
  • Serial for debugging / flashing?

Parts

  • e-eink screen 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)

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.