Eink-word-clock-watch: Difference between revisions
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* [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 | * 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.