E-ink calendar integrating google calendar og OWM onto a 7.5 inch Waveshare screen based on an ESP32 LOLIN32 board
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For many years I have been playing with the idea of breaking the barrier between physical and digital calendars - more specifically creating a nice looking e-ink calendar that can hang in our living room/kitchen. Now the idea has materialized in a very satisfying way, and I would love to share how I made it come true.
The calendar displays the first 9 events for all selected google calendars for a specific user. In my case I have selected that of my wife, myself and our shared family calendar. Besides the calendar, I have created a mini-weather display in the corner, showing an icon from OpenWeather Maps, as well as temperature and windspeed.
The project combine a 7.5 Waveshare e-ink screen, with an ESP32 microcontroller and a LIPO battery. It is packaged in 13x18 IKEA Ribba frame. Besides Arduino code for the microcontroller, I also had to create a google script to extract the calendar entries from google.
Credits to the ESP32 E-Ink Weather Station project on Github, from which I have learned a lot when coding the project.
Components:
- Waveshare 7.5 inch E-ink Screen (800x600 version) ~76 EUR on Amazon.de (linked to the yellow C version, as I could not find the red anymore)
- LOLIN32 ESP32 ~8-9 USD on Aliexpress (I used an older version, but get the D32 or D32 Pro as it has integrated battery gauge on pin 35)
- LIPO battery with 1800 mAH ~13 EUR on Amazon.de
- IKEA Ribba 13x18 frame ~3 EUR in IKEA
Total cost: ~100 EUR
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Pin-setup:
| Waveshare 7.5 | LOLIN32 |
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| Vcc | 3V |
| GND | GND |
| DIN | 14 |
| CLK | 13 |
| CS | 15 |
| DC | 27 |
| RST | 26 |
| BUSY | 25 |
Make sure to adjust the configuration.h file with both a link to your google webapp (that fetches the calendar entries) and with your location and API key for open weather maps.
For further guidance see my instructable on the project:
https://www.instructables.com/id/E-Ink-Family-Calendar-Using-ESP32/