I had no idea these "time since last opened" pill caps were a thing and also so cheap, and now I want to make these for all sorts of different reminders, like • when did I last feed the cat? • when did I last pump up my bike tires?

of course, it would also be tied into my home automation system so I could surface that data on other devices around the house. I'm imagining an esp32 with OLED screen and a nice push-button switch. Pretty sure I could fit that into a neat 3D printed case.

When did I last water this plant