Eink-word-clock-watch: Difference between revisions
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{{Project | {{Project | ||
|Name=E-ink wordclock watch | |Name=E-ink wordclock watch | ||
|Omschrijving=E-ink | |Omschrijving=E-ink wordclock watch | ||
|Status=In progress | |Status=In progress | ||
|Contact=jelly | |Contact=jelly | ||
}} | }} | ||
== | == 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 === | === Requirements === | ||
| Line 18: | Line 18: | ||
* SPI | * SPI | ||
* Serial for debugging / flashing? | * Serial for debugging / flashing? | ||
* RTC | |||
=== Parts === | === Parts === | ||
Revision as of 21:34, 13 April 2019
| Project E-ink wordclock watch | |
|---|---|
| E-ink wordclock watch | |
| Status | In progress |
| Contact | jelly |
| Last Update | 2019-04-13 |
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 or running for > one month
Interfaces
- SPI
- Serial for debugging / flashing?
- RTC
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.