DONE: At least for now. I need to evaluate the buzzer. It's a little weak. And I may add a digital counter display. Modules are on order to play with.
First I made a new interface board for the Nano. It is larger and can accommodate wire terminals. I've allowed for connections to a possible counter display and for an extra/option/external buzzer. With this setup. All I have to do is unplug the USB cable from the Nano, which is like a daughter board to the main PCB. Then I unplug the Nano and can take it to my office for any software upgrades. Simple
I got a new enclosure. You can see me marking it off by using another printed circuit board. Then the box drilled out. I decided that for strain relief I'd just go with a pop-in plastic ring. This isn't going to get moved around a lot so strain relief isn't a big issue. I also cut away all the tie wraps and used a nylon cloth sheath to make the wire look professional.
I carefully painted the box (Hornday red, of course) and heat cured it (140f for an hour). A picture of everything installed in the box. Finally a picture of the whole setup with the LEDs in the reset mode.
I've loaded 500 rounds with this setup and latest s/w. It worked really great and has provided me with the warning of missing primer that I've been wanting for some time. I'm at the bottom of my bucket of brass and some of this brass is in bad shape or has severely crimped primer pockets. My counter/warning system has worked like a champ.