Presence Detection for a Child with no Phone. - Lemmy.World

Next school year, my son will be left home after school for a few hours while my wife and I are at work. I’m looking for a way to detect when he’s home and have the front door unlock (among other automation scripts that are in place). I came across this post [https://community.home-assistant.io/t/child-with-no-phone-presence-detection/25360] and was going to get the Tile Pro as it seemed to check off all my requirements: - I could put it in his backpack where it can be forgotten. - long battery life. - Through the Home Assistant integration, it can trigger when it gets in range. - It also has a few other beneficial things, so I was thinking of putting one on each of our bicycles in case they’re ever stolen. Hell, I could look into putting one on my cat’s collar in case she ever gets out. Then I came across some concerning articles regarding data harvesting [https://www.theverge.com/2021/12/9/22820381/tile-life360-location-tracking-data-privacy]. The whole reason I started self-hosting was to prevent data harvesting, so it seems like the Tile is a non-starter for me. Has anyone been in this (or a similar) situation? Mainly, I’m looking for a device I can put in my son’s backpack that can trigger when he’s within range, so the house will open for him. BLE seems like it might be a solution, though I run my server on an old Dell r720 enterprise server in my basement, so I don’t currently have Bluetooth functionality (and it’s pretty far away from the front door, 20+ feet), though getting that is not a dealbreaker for me.