You can use it as a security camera on the cheap.
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You can glue them together for double phones.
Ive seen people building whole houses from empty bottles. He could do the same with those phones. He would end up with true "smarthome"
SyncThing backup storage.
Wifi based walkie talkies for the kids? hehe
I have one in the door peephole. Using Android ip webcam I can turn it on to see through the screen who's behind. Also i added it to home assistant so I can see through it anytime. If someone rings turn the screen on, so you know who is it without getting too close. Send a photo to your smartphone when somebody rings...
What if they dont ring but start to lockpick/bash your door right away? :D
Home security is to deter would-be criminals, not prevent determined criminals. Ultimately if someone wants to get into your house, and has the skills and tools to do so, you aren't going to stop them
Use the accelerometer as a break-in sensor.
Home assistant + fully kiosk browser
(Or root + termux + docker)
Turn them into security cameras:
https://play.google.com/store/apps/details?id=com.ivuu&hl=en_GB&gl=US&pli=1
You could also have a look at r/androidafterlife
I used mine to monitor stats on my gaming PC with an app called Remote Systems Monitor. I think you have to pay a one time fee to unlock everything, but it was well worth it imo. The application on your PC sends the data to the app over your network locally.
I paired it with Automate app, so when my PC turned off the power to USB got cut, the phone would lock and dim the brightness down to 0 - just so I'm not frying the battery. Then it would do the opposite when I turned my PC back on, was a pretty fun little project to do.
Turn them into sms gateways
r/androidafterlife is a good place to look
Something I was looking at the other day: you can use them as Streamdecks. (StReam, not Steam.) Basically they become external keyboards, each key being assigned to a function such as start a program, select a tool or whatever, with a graphic to suit.
Elgato (who make the Streamdeck) make an Android app to use a phone as a deck, and there are several other such apps.
Line them up using a stiff support and take 3d photo’s.
Currently using 4 android phones I got from friends/families "junk drawer" to use as a home security system.
That sounds really interesting. Can you share how you set this up and what software you used?
It's just an app from the play store. I've looked into self-hosted open source things but didn't find much. The app I use is called "Alfred". It has the basic features. Motion sensor People sensor Saves the motion clips to the cloud Continuous playback Two-way talk Auto-low light Etc...
You you keep the phones permanently plugged in or charge them periodically?
Plugged in all time,screen off, battery saver on 😊