Those are kinda what I mentioned originally. The first is for roller shades, the second for curtains. They’re good at what they do, but that’s not blinds.

I’m fine with them being battery powered. The nice thing about having a window right there is that it can have a small solar panel up high to recharge if needed.

I’ve got several sensors and even a deadbolt that run on battery, and they go for over a year before needing a replacement.

Does your August lock allow multiple codes? I’ve got a Quickset keypad deadbolt that does, and that allowed me to set a code I gave my neighbor, and the lock reports which code was used. If yours does something similar, you can give kiddo a separate code, then when that code gets used after school, the house does the needful. No key to lose or tag to track that way.

This is how my partner and I do our notifications. We’ve got “him”, “her”, and “us”, depending on who needs the notification. Whenever either of us gets a new device, I add it to either of our groups and then works.