REMEMBER YOUR STUFF BEFORE YOU LEAVE!!! Answered
So I've got a real problem with leaving my stuff behind when I head out the door, and I was wondering how possible it would be to have a small device to help that. What I was envisioning, essentially, was little chips, RFID chips maybe, that you'd attach to your phone, wallet, keys, anything else. A reader would sit by the door, low power enough to give it just enough range to scan the doorway. You'd leave, but there'd be a sign on the wall showing checkmarks next to the things you have. Adding something to the list shouldn't be too difficult, or setting up a different person. This could show on a screen or using some kind of mechanical method. Either way, shouldn't need to ever be more than eight items. Anyone done something like this?