The Orange Pi Zero 2 hardware looks to be an interesting and available Single Board Computer (SBC). See http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-Zero-2.html for the hardware details.

[ i ordered from https://de.aliexpress.com/item/1005002002861625.html with a plastic case for approx 40 EUR - including delivery in May 2022 ]

With one single USB jack, you'll need an USB-Hub to connect multiple USB devices (RTL-SDR dongle, GPS-Mouse and additional micro-SD card).

Unfortunately, the first two USB-2.0-Hubs, i tested, didn't work: data-transfer from RTL-SDR (reception) did break the connection. I assume, that higher power consumption is the reason. Not sure.

With following devices, the connection looks good:

• https://www.amazon.de/gp/product/B09Z2128H7
• https://www.amazon.de/gp/product/B09Q2P3NZZ

Be aware, that following things are NOT working with Linux:

• Mali GPU
• Video codec

The info about that can be found - sort of hidden - in the User Manual in chapter 3.2 Linux4.9 kernel driver adaptation status of the file orangepi zero2_h616_user manual_v1.6.pdf. Happily, none of these are necessary for the FMLIST-Scanner.

Wiring (ATX-buttons, LEDs or Piezo-buzzer) is tested meanwhile - but with not so good results:

Using https://github.com/orangepi-xunlong/wiringOP can set output pins, e.g. LEDs. This does work.

Ideally, this is done utilizing hardware PWM support - to save CPU interrupts. But i could not find any GPIO pin, capable of hardware PWM. Software/emulated PWM for the buzzer might work - haven't tested so far.

Sensing/reading GPIO input with internal pull-up/down resistors doesn't work with the WiringOP library. This, ATX-button won't give correct state - without external resistors. See https://kalitut.com/raspberrypi-gpio-pull-up-pull-down-resistor/, how external resistor would need to be wired. I didn't try for now.

Upload of result - by pressing the button - won't work.
But, shutdown and reboot can be performed with the builtin power switch.

Happily, at least for static (non-mobile) use, you won't need any of LEDs, buzzer or ATX-knobs.
Buzzer and LEDs are nice to see/hear some progress, but you can go mobile without .. and check progress through an internet connection over phone/tablet and WiFi.

I would recommend some heatsinks for the CPU - as temperature does temporarily rise over 80°C.
Ideally, i'd also suggest a CPU fan, but couldn't find a suitable housing.

Orange Pi does provide a Debian Image for the Orange Pi Zero 2 at http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/service-and-support/Orange-Pi-Zero-2.html.

There are also some Ubuntu images ; but i did only try the latest Debian one from May 9th 2022. An older Ubuntu image failed running rtl_test and rtl_sdr.

Following the Debian download link to Google Drive, choose
Orangepizero2_3.0.0_debian_bullseye_server_linux5.16.17.7z
(as i did), cause the scanner doesn't need a desktop.

Please follow the instructions in chapter 2 Instructions to use the development board of the user manual to write the image to a micro-SD card.

You should be able to boot and login with one of following user accounts as described in the user manual

i strongly recommend to change the default passwords!

Default hostname is orangepizero2.

You should be able to connect with

ssh orangepi@orangepizero2

It depends on the USB-Hub, if devices can be resetted .. and run flawlessly afterwards.
With a tested USB-Hub, after a resetScanDevice.sh, the device was listed but freezed on rtl_test and rtl_sdr. In the scanner configuration file, FMLIST_SCAN_RESET_DEVICE needs to be disabled.
FMLIST_SCAN_DEAD_REBOOT might be enabled instead.

anyway, i could NOT run rtl_sdr at all, when using an USB-Hub!!!
i could run the scanner, when connecting the RTL-SDR dongle directly to the Orange Pi Zero 2, having no free USB jack to connect GPS mouse or a memory-stick!

If you intend to use the scanner installed at a fixed place, e.g. at you home, you won't need to connect a GPS mouse, by configuring the GPS coordinates manually. And, i'd dislike, but you could write the results directly onto the same SD-card - as the OS, by configuring FMLIST_SCAN_MOUNT=“0” and setting FMLIST_SCAN_RESULT_DIR.
However, i would prefer an Orange Pi 3 LTS for a slightly higher price.

Please continue with 2.2 Setup on a pre-installed Pi or PC