So, I got myself a superb quality singleboard computer and turned it into a project. I use this server for multiple purposes: Sandbox, storage, webserver, and I've got Irssi running 24/7..etc.
For example: A friend got me a nfc reader + card. The best thing I could come up with, was connect it to my DIY server and make it run a script that sends an email. The best thing about this device is that I added a lithium battery that I can switch on whenever the Lime is unplugged from it's main power supply. The server doesn't lose it's power for a while.
I've found most parts at my local hackerspace, so check your surroundings, ask friends.
Hardware:
* Olimex Lime2 A20
* 32GB MicroSD card
* An old server power supply rack
* Lithium Ion battery 3000mAh
* 3mm thick piece of wood (Size depends on the size of the power supply rack)
* White paint to decorate plywood
* Computer to flash your SD card with
* 500GB SSD
* A switch to power on/off the Lithium battery
* Wifi Dongle
* Olimex Lime2 A20 Manual
Cables:
* Jumper Wires
* Power supply (5V)
* SATA (data cable) and power cable. Please follow the link below:
I installed an unofficial Armbian image which works fine, but is now unsupported. You will find an archive of Armbian images for this board, on the their website.
OS:
* Armbian Focal (https://www.armbian.com/download/?tx_maker=olimex)
[Latest Armbian OS (Unofficial)](https://armbian.systemonachip.net/archive/lime2/archive/)