This is based on the university one, and I don't actually know if it works.

They used PIC16F84A for this devlopment board. https://ww1.microchip.com/downloads/en/devicedoc/35007b.pdf

This was made almost entirely to see how easy it would be.

Conclusion: It was pretty easy after I worked out what the switch was doing.

One major improvement to the original design by the uni, was removing the need for a ground plane, this makes it cheaper and easier to manufacture.