I wrote the firmware. It took a bit of figuring out to get started but I think it’s good now. There is a home and an alarm page. The left button decreases time for the alarm and the right button increases it. The middle button is like a mode button, so on the home page pressing it takes you to the alarm page. Then pressing it changes the focus from editing the hour to editing the minute, then back home. I’m not sure I’ll keep this structure but it’s what I thought of first so I made it.