You could rig something up so you have the magnet side of an open/close sensor on your keys as a keychain and the actual sensor on the wall and then set it up so you hang the keys by the magnet itself in such a way that it will always trigger the door sensor when hung up. Other than that you might have to create a device yourself.
Instead of rigging up a special customer device, i was thinking that this is another place the SmartThings Multi could shine. Most key storage setups feature a series of hooks attached to a backing that is mounted to a wall. If you attach (glue/tape) a SmartThings Multi to the backing of the holder the smartapp could read like this “on presence, schedule 10 min wait, notify (I’m hungry for your keys!) / on acceleration cancel schedule”
Thanks for your suggestion. Yes, that’s exactly my current situation at home. I have a wall-mounted shelf with a series of hooks underneath. I’d be willing to change the setup for the right solution, thought.
But I think that the downside to this idea is that it will nag me every single time I come home, so over time I would probably just start ignoring it. It would really work best if it only chirps at me specifically when it determines that the keys are not placed in their proper location within x minutes of arrival.
I don’t seem to be having any luck finding a pressure sensor that works with the SmartThings hub, though.
If you have a metal key ring (the part that hangs on the hook), you can use two nails or metal hooks close together (but not touching) as the hook, such that when the keys hang, the key ring makes contact with both nails / hooks. Then you hook up the two nails to an open / close sensor with a contact sensor, like the Schlage RS100HC, which has contacts that you can hook up. From there it’s a simple matter to monitor the state of the switch and warn when it’s not closed after a certain period of time.
You could also have the keys on the hook pull down a pressure sensor contact. You can make these very cheaply if they don’t have to take much weight.
There’s a lot of discussion in the smart chair project topic.
Pretty much any sensor that can detect a change that you know will only happen when the keys are there can be used.
You could put an upside down cup on a string hanging above the sensor with a light indicator, so that when you put the keys on the hook at the end of the string the cup gets pulled down over the light sensor and when you pick the keys up again the cup goes back up above it.
So some methods require more precision, like hitting the two contacts on the moisture sensor, and others you just have to get in the general vicinity. And still others use the weight of the keys to move something physically which then triggers the sensor.
Lots of options.
If it was me, I would just use a box with a drawer with a contact sensor. Or use a cookue jar with a motion sensor on the lid. That’s how a lot of medication compliance tracking works. Super easy to set up. Of course somebody could open the drawer and not actually put the keys in, so it all depends on your use case. Would the person actually open the case and not put the keys in? If so, then you need to go to one of the methods that physically includes the key.
I really do appreciate all your help but I’m a complete newbie and not a programmer, so I have no idea what “on acceleration cancel schedule means.” Can you explain what that means and how to set it up?
I think that I understand the basic concept. What you’re saying is the the metal keyring completes the circuit between the two posts, right? That sounds like it would work.
However, besides not being a programmer, I am also not an engineer. Am I right in understanding that this would involve opening up the RS100HC and attaching wires to contact points within the unit and then attaching those wires to the two hooks/posts? I’m not sure that I would know how to identify the contact points within the sensor. And I suppose it would need something to solder wires?
I am a bit over my head here. I’m afraid I have ideas but no idea of how to execute them!
That’s why I suggested the open/close sensor idea, should be pretty simple other than figuring out a system to mount it. Only downside I see is that it might not be the most beautiful thing in the world… As an engineer I very much appreciate the K.I.S.S. methodology…