I just recently bought an Arduino Uno and I'm having trouble finding a guide for what I want to do. Basically, I want my friend (who lives in a different country) to be able to send inputs to it, preferably through a small GUI because he's not too code-savvy. I've been thinking of just building a GUI for it on my end and letting him control it through something like Teamviewer but that wouldn't be as fun to make. The Arduino board will be connected to my computer the whole time so I'm hoping I won't need an Ethernet shield or anything similar.
Are there any other ways to go about with this? Thanks in advance!