Eink-word-clock-watch: Difference between revisions
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{{Project | |||
|Name=E-ink wordclock watch | |||
|Omschrijving=E-ink wordlock watch | |||
|Status=In progress | |||
|Contact=jelly | |||
}} | |||
== E-ink word clock watch == | == E-ink word clock watch == | ||
Revision as of 21:33, 13 April 2019
| Project E-ink wordclock watch | |
|---|---|
| E-ink wordlock watch | |
| Status | In progress |
| Contact | jelly |
| Last Update | 2019-04-13 |
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) 3.7 V 180 mAh 502025 Lithium Polymeer Li-Po should fit under the display, but might be too big.
Hardware
- Display size (e-ink) 31.8mm × 37.32mm × 1.05mm
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.