I’ll second the “what can I use it for” question. I’ve also got a couple older ones including a model B from the first run 7 years ago. I may keep that for posterity. I’ve thought about donating them since any computer beats no computer to those without.
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Just run Pi-Hole on an Old Raspberry Pi board to block internet ADs in your entire network
Make a NAS (though it will be slower than Pi4)
A data logging platform (use influxDB, Grafana, Nodered, Mosquitto MQTT) - you can also port forward your board to access all of it over the internet
A web server
These were some uses I came up with because I used my old boards for this.
Just make a Home media center to stream content (you can install Android also - i guess) or some OS on the board and connect it to your TV. No need to buy Chromecast ot anything. [I have never tried it though]
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I'm running a home automation system on a Pi 2. Good thing of the older Pi's is hat they are much less power hungry than the 3 and 4 and also disipate less heat, which is good for a system that is always on.
I have a few Raspberry Pi 1 and 2 Model B V1.1. I will trade them for other interesting stuff.
Other dev boards available:
-Odroid with display and battery
-Microchip multimedia board
Too many projects.....too little time....