This evening I implemented the charge and discharge functions, and the autocycle function. The autocycle doesn't work yet, but charge and discharge work on their own. I decided not to use TKinter's after() function as it's not quite what I want. Instead I am using update() which does what I want. Its use is frowned-upon however, so I hope it won't bite me in the future. The next step is to build the hardware, which requires making a PCB, assembling it, and testing it in conjunction with the software. I can do a little more software testing without the hardware, but this is a system and really needs both parts for proper testing and verification. I'll be travelling again soon, so probably won't do much for a couple of months. Anyone else who'd like to try- please go ahead. Pull requests are welcome.