What you need
Raspberry Pi
Digital Interface
Network – wired is better

*This guide will show how to install Allstarlink, which will give the ability to use Echolink
The OTVARC allstar/Echolink node was built with a similar setup. The only difference is that I upgraded the Pi with a mini PC to handle extra users. When I originally set it up, it was much more manual.
This uses a custom image from allstarlink. Install following the instructions below.

Full guide here: https://allstarlink.github.io/install/pi-appliance/pi-detailed/#step-by-step-pi-appliance-setup

Here is a Pi hat that looks interesting
https://elekitsorparts.com/product/new-digipi-hat-ham-radio-digi-modes-aprs-ft8-ft4-winlink-from-raspberry-pi-km6lyw-digipi-image/

Want to connect via Allstar to the OTVARC repeater with your phone? Try this guide here: https://otvarc.org/otvarc-allstar/