ScreenWall – Turn old phones into synced widgets for your space

by buibuibui • 5 days ago

124 43 5 days ago

buibuibui11• 5 days ago

Working on ScreenWall (https://www.screenwall.app) because I had old phones sitting in a drawer doing nothing, and now I use them as passive widgets on my desk and wall. I use the browsers of the devices to join a shared "wall". From there I can push images, video, gifs, or a synced canvas to it (and any other old screens I add) without installing anything. Started as a one-device hack for my desk clock, but it scales to syncing multiple screens at once if you've got more than one old device lying around.

buibuibui11• 4 days ago

The oldest device I found that works with ScreenWall as a widget display, is an iPad 3 (2012)!

prmoustache2• 14 hours ago

Usually I replace a smartphone because it has some hardware fault that makes it unusable and it is hard to repair or the cost of repair vs capability is not very favorable.

Even if I was replacing smartphone before they died, I would probably sell them anyway. Do people really have various phones in working order waiting in a drawer?

NeuroWinter• 13 hours ago

I will upgrade when my device is many generations out of date. So no one really wants to buy one and I will then buy not the latest but a generation or two “out of date” so it’s cheaper. So I have a heap of phones over the years that no one wants. Not even me.

gonzalohm2• 11 hours ago

Usually I replace my phone when the battery is almost dead and a full charge doesn't last more than a few hours. At that point the phone is usable but not good enough to sell. I usually keep it as an emergency backup phone

crefiz• 10 hours ago

You might as well buy a new battery then

Did that for 20 € for my Oppo Find X3 Pro at my closest tech store and saved me from buying a brand new phone

prmoustache2• 10 hours ago

For some reason I tend to break screens way before the battery dies usually. I am not afraid to replace a battery or even a screen if phone is not totally out of date. Having said that there seems to always be a point when they start acting semi eratically or stop booting.

I had a totally outdated and probably insecure Samsung S6 edge 2 years ago that started rebooting randomly. I think that prior to that it was so old I could only install stuff from f-droid and aurora because roots certs installed on that old android version were too old for playstore to work. Too bad as you can't easily find smartphones in similar sizes anymore.

Knocking on wood my pixel 6a still going strong after 2 years.

pmontra• 10 hours ago

I never sell anything, everything finds a new life.

I got a Sony Xperia Compact from maybe 2016. I use it as a bicycle navigator / recorder. Recently it stopped reading SIMs, probably rusty contacts, but all I need is wifi to update OSMAnd and send me the tracks I recorded.

I also have a very old tablet, maybe 2014. My SO uses it to view movies with VLC and TV via TVHeadend.

mannykannot• 8 hours ago

I take my previous phone kayaking. Once I have downloaded the appropriate maps over wifi, I can use it for navigation, logging and photography without being worried by the prospect of dropping it in the water.

jerlam• 6 hours ago

I try to get rid of my old stuff ASAP, it reduces clutter both physically and mentally.

I know many people who had their old phones and computers lying around because they didn't invest the time to transfer the data. Not long after, the phone was unusable either due to hardware problems or forgotten passwords, and the data is lost forever.

buibuibui11• 12 hours ago

Oh wow, although I submitted it some days ago, I somehow got on the front page! Thanks for that! Also as a note: this platform is nowhere near finished! I had this idea in my mind for a long time that I wanted to reuse my old phones and tablets as displays in my home. I also know that finding the right apps for these old platforms is a challenge in itself, that's why I went the route of creating an ES5 (that nobody writes anymore!) web app that most of these devices still support. The client's whole purpose is to display canvas and media files that the server dictates on-demand via websocket, while keeping a synchronized clock. On Instagram I always saw these very cool widgets like retro clocks, split-flip boards, YouTube subscriber counters that I felt urged to buy. But I thought to myself that the old phones I already have could also do the same. I am a long-time software engineer myself, but could never take the time to validate whether my ideas work. So I thought, why not try it out with Codex. After long prompting, supervising and correcting, I got a very usable solution that I now pleasantly use myself at home.

buibuibui11• 12 hours ago

You can also vibe-code your widget if you want! You are not restricted to use the built-in ones. Just copy the "Canvas Widget Guide" you find under "Left Sidebar > Create > Smart Widget > Tutorial" and copy that article in ChatGPT or Claude while describing what your widget should display.

Then paste the code to "Create > Smart Widget > Edit the Code" in the Widget Details. (this flow should be more intuitive...)

You are able to send JSON data to your widget via an API.

It's all just canvas and old Javascript code!

rippeltippel• 11 hours ago

Very nice project, thank you for sharing it on HN! May I ask why login is required, and how are emails/passwords stored?

buibuibui11• 11 hours ago

An account is necessary to couple your devices to your wall. And auth is implemented via Better-Auth. I stopped Codex immediately when he tried to implement the login stuff from scratch. :)

darkwater• 7 hours ago

Gotta get a lot of downvotes here but I don't care, I stand by my opinions: this is the best example that not all vibe-coded apps are "slop". If you have enough experience (or are smart enough to speed-run experience), good ideas, good attention to details and decent taste you can totally vibe-code cool things that are worth sharing. This true/false dichotomic attitude towards apps you see here from many HNers where "written by hand: good/vibe-coded: bad no matter what" really rubs me the wrong way.

qdot76367• 3 hours ago

I have a pile of phones on my desk going back several generations because I've wanted to build exactly this but it's been a constant "soon" project.

Thank you for accelerating "soon". This is wonderful.

kotaKat• 12 hours ago

Junkyard Jumbotron redux? ;)

https://github.com/mitmedialab/Junkyard-Jumbotron https://www.youtube.com/watch?v=cAUtSVSTbzU

buibuibui11• 12 hours ago

I like the wall position detection feature via markers! :)

takenotice• 11 hours ago

That’s what I was thinking. I loved that project.

JackMorgan• 12 hours ago

I've wanted to build this myself for a long time but couldn't figure out how to overcome the spicy pillow problem.

Maybe I'm barking up the wrong tree, but I thought it was risky to leave a phone plugged in all the time. Does it need to be a modern version of Android OS that has the smart charging that stops at like 85%?

cydodon• 11 hours ago

The safest option is probably to remove the battery and run the phone from a (well defined/build) external power source, e.g. like this: https://yaky.dev/2022-09-06-smartphone-without-battery/

NordStreamYacht• 11 hours ago

Not all phones work without a battery in the case.

wolvoleo3• 4 hours ago

Yes that's what I do too! I didn't know that blogpost but I generally replace the battery with a DC-DC converter module from Ali. You can even tune the voltage and see the indicator change the battery charge level. I put them around 4 volt. The advantage of these modules is also that you don't need a beefy 5V power supply, you can simply grab a 12V or so (I have a full drawer of those from shucking external hard drives) and it will regulate it down nicely. They are 80 cents a piece (10 for 8 euro): https://es.aliexpress.com/item/1005007508685885.html and they can deliver up to 3A or so which is enough to handle the peaks. They're a bit bulky but I just tend to mount them elsewhere. Make sure you use a fairly thick cable to the phone then to minimise losses at that low voltage.

I didn't have to bother with the thermistor but some models need it yes. And some even have an i2c charge level module which is even harder to simulate though it can be done.

khurs• 10 hours ago

I thought it was risky to leave a phone plugged in all the time

I have had phones on a charging dock for long periods. No issues.

Unless you have some budget small brand phone that was too cheap to be true, most phones are fine plugged in.

inigyou• 9 hours ago

It's a statistical thing. Most phones don't explode their batteries. When you have a hundred or a thousand together, the chance that at least one has a battery explosion starts to reach concerning levels and you ask what you can do to avoid it.

t-3• 8 hours ago

I left my ~$1k OnePlus phone on the wireless charger for after ATT told me I couldn't use it and forced their spyware Samsung phone on me, The battery puffed up after about a year.

joenot443• 10 hours ago

I'm confused - is the product finished yet?

buibuibui11• 6 hours ago

This is work in progress project of mine! I have so many ideas how I can make it better, but before I overengineer it just for myself (I think this is typicial engineer mentality), I wanted to submit it to HN before I lose my interest over time, like my other projects…

TheJCDenton• 10 hours ago

Congrats, this looks very cool! I haven't tested it yet, but is it possible to make it work offline? I'd prefer devices running unsupported or unmaintained operating systems to avoid Internet access altogether.

buibuibui11• 7 hours ago

I see you. I am thinking about providing a self-hosted version.

Jemm• 10 hours ago

The flight sim community is going to love this project for home cockpits.

XLowPingFNX• 8 hours ago

I literally wanted to use RasberryPi to build this for my desktop since i loved those desk widgets showing cool info like the weather or time ... this is so cool!

davsti4• 7 hours ago

Sounds great, but why create an account mechanism for something that can be accomplished locally? Who's data are you mining?

buibuibui11• 7 hours ago

The account mechanism is just used to scope the devices to „walls“. Otherwise I don‘t mine anything. But I share your sentiment, that this should maybe a self-hostable tool.

buibuibui11• 6 hours ago

I am interested to hear what features you guys want in the next iterations! While building ScreenWall, I actually had art installations, home dashboards and train depature info screens in mind. Interacting with the screens and triggering events across other screens is also in the pipeline. Would be cool, if you can give me some crazy ideas, so I can prepare the client runtime better.

adamsmark• 4 hours ago

This might be a good alternative to Terminal. I can use a cheap e reader like the Boox Go 7 to display whatever.

tamimio• 3 hours ago

Ok great loved it, the typical question, can I self host it? Besides privacy, I won’t need internet access.

buibuibui11• 3 hours ago

Please keep an eye open on the website! I will publish a self-hosted version soon.

ScreenWall – Turn old phones into synced widgets for your space

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