Clever Geek Handbook

Weather informer on color e-paper display

About three years ago I bought a color e-paper display “Waveshare 4.2 inch e-paper module” on Ali, motivated mainly by the desire to try the new technology with my own hands.





The display can display 3 colors (white, black, red) with a resolution of 400 x 300 dots. Connection interface - SPI. In total, you need to connect five information signals: DIN, CLK, CS, BUSY, RESET. Plus, of course, GND and power.





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Fig 1. Schematic diagram of the Informer
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Fig. 2 Debug informer mode
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Fig 3. Debug information of the informer on the tablet screen
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Fig. 4. An informer in debug mode with a Bluetooth module and a large red LED.
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There is a subtlety: you need to enter a password when running a batch file. This can be easily done by sending a file with a password to the command input like this:





schtasks /change /tn !epaper2 /st 21:20:15 /sd 08.03.2021 < enter.txt







the enter.txt file contains the password and linefeed (pressing the Enter key)





Reception is very old, but quite working.





Results:





Fig 7. Informer on the wall in the hallway.
Fig 7. Informer on the wall in the hallway.

The informer has been successfully working for 3 months, the current battery voltage:





Fig 8. Battery voltage of the informer in millivolts.
Fig 8. Battery voltage of the informer in millivolts.

And according to calculations, the battery should last for 478 days.







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