How can I use a 5" screen as a display for a Mac Mini? Is there a way to over-ride HDMI settings? I purchased this 5" screen with 800x480 resolution:
https://www.amazon.com/gp/product/B013JECYF2/ref=oh_aui_detailpage_o00_s00?ie=UTF8&amp;psc=1

The Elecrow screen is primarily designed for Raspberry pi, but I would also like to use it as a screen for my Mac Mini (running Mac OS X El Capitan 10.11.3) connected by HDMI.

I have programming experience and would be willing to experiment. An easy solution would be great (some driver to install?),  but some way to over-ride the settings of the HDMI  port to send a signal which the screen can understand also sounds like a potential solution.

Any ideas welcome, thank you for the help.
It's working.

My HDMI cord wasn't fully plugged into the Elecrow screen.

Anyone who encounters this, it's totally possible.

This screen is so great (cheap, works and portable).