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I’ve been wanting to do some projects like this from the software side. I want an e-ink display + ESP32 inside a case. But I don’t want to do that myself for the nth time as it doesn’t feel novel or interesting. Is there any decent hardware option that begins fully open?

Also: If I take very good care of my Weathergotchi, do I get to change the weather?

Calling this a tamagotchi is silly. The only thing this and tamagotchis have in common is that they’re small electronic devices with a screen (and even that tech is different).

When you compare a project to something that it isn’t, you’re doing it a disservice. The people who are intrigued by the tamagotchi angle are disappointed, while the people who are uninterested in it (but might still like the project) won’t even give it a change. Everybody loses.

It's marketing. Attach yourself to some wildly more popular brand for no reason other than to boost your own popularity. Like JavaScript did with Java.
I get the weather- part, but I don't get the -gotchi part... Do you have to keep the device alive by... seeing new types of weather?
This doesn’t look as fun as a Tamagotchi.
The YouTube video [0] is quite funny, I like when someone doesn't take themselves too seriously.

[0] https://www.youtube.com/watch?v=I44iGj7gLGA

I have no idea what he's talking about most of the time but I can't stop watching.
Ouch, shade on the SensorPush. I had 2 and I got 2 more. It requires an app, but they're quite well made imho.

But yes, open source would be better. If physical portability is not a requirement, Xiaomi hygrometer 2 with this custom firmware https://github.com/atc1441/atc_MiThermometer is quite excellent

He does it all: the YouTube face, the math floating around, non-working greenscreen, some memes and then he goes camping (including a Blair Witch style run through the snow). This is so brilliant.
This is charming. E-paper is such a good fit for ambient data like this — always visible, no glow, basically no power. How often do you refresh the display, and does partial refresh ghosting become a problem over time?
While I'm not sure about the exact e-paper panel model used in this project, in my experience with these small e-paper screens, a full refresh is pretty much mandatory every 10 or so partial refreshes—which is significantly worse than Kindle-level performance. Just about every screen I've worked with suffers from some level of ghosting, and it definitely gets noticeably worse in higher temperatures during the summer. Plus, these cheaper e-paper displays tend to degrade quite fast—after a couple of years, the aging becomes painfully obvious.
As opposed to the climategotchi, which just shows a dead guy on fire.
I see the antenna points straight at ground and buttons. Is the wifi ok?
I found some kind weather sensor like this in a creek in a sealed clear film canister-sized container.

I took it home and looked up the part number. Looks like it was probably part of a network of sensors monitoring the forest health, but some ziptie broke on this one and ended up starting to get washed away. It ran on a big watch battery. I didn't try to get the data off it.. don't recall how data access worked for it.

Cool. What about porting this to pwnagotchi, then?