This is the replacement controller I built for the wheelchair lift. The controller itself is in the middle. The four board on the left and right are a testing harness. The red and black wires are 24VDC and the green and white ones TX and GND for monitoring with a terminal program on my notebook (puTTY)....
This little power supply board plugs into a ProMini shield stack or the ProMini Backplane boards that I designed. It’s basic but it has a couple of nice features....
I built these a few years ago to let me use UNO shields with Pro Minis to speed up prototyping. This was an early version. Later versions had more and more features added until I didn’t need the shields anymore. That’s when my Pro Mini Backplane was born.
There are a bunch of these in my Arduino bin and in one project or another. My maple syrup machine started on an UNO but ran on a NANO V3 for several years before moving to a MEGA2560 Pro Mini....