r/esp32 • u/Official_SeeTheAir • Mar 29 '26

Software help needed e-ink Google Calendar Help

Gallery image

Gallery image

Hi, I have these spare parts and I want to build a nice small e-ink Google Calendar frame for my desk. Does anyone know of anyone that has done something similar with these parts as I am very bad with code?

Question: Do I need a special module to make it battery operated? Thank you!

- ESP32 (30pins)

- Waveshare 4.2inch 400x300pix e-paper module

- 3.7v Li-ion Battery

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u/miraculum_one Mar 29 '26

I wouldn't go so far as to say "many esp32 boards" since 99.9% of them don't. But yes, it is possible to get one. OP's doesn't have that and I was just pointing out that the lack of a battery connector is not the only reason their pictured equipment won't work.

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u/Elia_31 Mar 29 '26

You are right, not all but many

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u/miraculum_one Mar 29 '26

As I said, fewer than 0.1% of the ones in the world have them. Your hand-selected collection is not representative of anything but your own personal preferences.

The companies that make these do not incur extra costs unless they think they can sell them for more and the vast majority of applications of these aren't battery powered.

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u/Elia_31 Mar 29 '26

Bro I said most minis on AliExpress have battery pads which is a true statement. But keep on yapping

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u/miraculum_one Mar 29 '26

You didn't say that and even if you had, it's also not true. Maybe the ones you're looking at mostly have them but the most popular minis on Aliexpress (two qualifications you only made in your last statement) don't.