Eink-word-clock-watch: Difference between revisions
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=== Parts === | === Parts === | ||
* [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] [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 (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. | * 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. | ||
* | * | ||
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* atmega 328P 320 uA "active mode", 200 nA power down and 1.3 uA power save. | * atmega 328P 320 uA "active mode", 200 nA power down and 1.3 uA power save. | ||
* stm8s | * stm8s | ||
* [https://docs.espressif.com/projects/esp-idf/en/latest/get-started/get-started-pico-kit.html esp32 pico] 150-10 uA | |||
=== Hardware === | === Hardware === | ||
| Line 35: | Line 36: | ||
* 3d printed case | * 3d printed case | ||
* arm strap? | * arm strap? | ||
* I2C RTC chip | |||
=== 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. | ||
=== 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.