Author here! It was quite a surprise to see one of my old posts on HackerNews.

For those interested in what happened next: I managed to build and run sqlite, rsync, and dropbear SSH on the SD card using buildroot: http://buildroot.uclibc.org/

I quickly moved onto other interests as I couldn't work out any practical applications at the time.

Feel free to reach out to <me AT fernjager DOT net> if you have any ideas, or want to pick my brain on this project.

So one of my problems with the stock functionality is that I wanted it to automatically upload images to my samba fileserver at home, rather than some weird tablet/cloud service. Having some way of printing to my network printer would be awesome too.

I also like the idea of having a tiny, relatively cheap, long running deaddrop wifi hotspot on batteries. Any idea of how long you could run it for from a button battery?

Could you create a half decent mesh network / wifi repeaters with these taped at various locations?

I could imagine a wifi hacking linux distribution like xiaopan might be quite fun too, or something with tunnelling / vpn that can connect to a hotspot and make it safe.

If there were some way to add a few sensors to it without making it much larger / power hungry, that could be really cool, especially considering how much space you have for logging.

I'd like to see if one could be surreptitiously built into a usb cable, or wall wart, so it's powered when the usb cable is plugged in, but otherwise there's nothing obviously special about the usb cable.

Amazing work, I didn't know there was a complete linux system on this! I guess it's cheaper than having a custom hardware.

Potential use case: turn a simple printer equipped with an sd-card slot (to print photos directly on the printer) into a manual wifi printer. The job would be converted to, say, jpeg, sent on the sd-card and then you would have to print it manually.

Other use case: be able to send any file to this SD card, this way you could easily transfer pictures, videos and music to a non WiFi multimedia device, like a TV Tuner, MP3 Player, etc...

Could you potentially still use the card in a camera, while it was running linux?

Yup! One of the advertised features for the SD card is being able to stream just-captured photos automatically to the mobile app.

The SD card has a script that monitors filesystem changes, and would push the images via curl to the client connected to it through WiFi.

Man, I thought that getting a "yes" back would lead to a Eureka moment for some awesome use case...but the best I've got is just how cool it would be to show off, haha. Amazing work!

Here's an open source music composition and notation program :)

http://musescore.org/

According to author's post in the Reddit thread, it has a 400MHz arm9 with 30MB of RAM.

That's actually pretty decent considering what it is.

Do you think you could run owncloud or something similar to use it as a sort of wireless flash drive?

or maybe it could be used as a ultra low energy bittorrent client: the cpu should be fair enough (many router/nas use 800mhz-1ghz ARM cpu and they offer bittorrent and other clients) and even though this device is low on memory (32MB RAM) it looks like transmission client can use only 10MB or RAM: http://pastehtml.com/view/5tx16jw.html so MAYBE it could work.