Shrink the size of the presence sensor

I have to say the presence sensor is nice for things like backpacks and purses, but when it comes to putting it on your keyring, the thing is huge!
I noticed it uses a CR2032 inside and that is taking up the majority of the board space. Around it, however, seems to be more plastic than is really necessary. I think if you went to a super durable plastic you could shrink the overall size by 1/3. Perhaps later on, moving to two CR1632’s side by side wired in parallel could take the size even smaller.

Presence Sensor vs Actual Electronics Inside

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We have designed some new enclosures for this device if/when we do another run of them. It is much smaller but uses the same board and battery form factors.


“If”? That doesn’t exactly inspire confidence. (c;

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There is lots going on in the design and production of the next version of our devices. This one will likely stay the same thru the rest of the year with a new version in 2015 sometime.

I’d be interesting in replacing the housing on the presence sensors.

@Ben any way to increase the polling times on these? 30 secs is causing the alarm to go off when someone opens the door before ST notices presence chance. Or maybe I’ll get a motion sensor plugged in to increase the range so it tracks it sooner.

Good to hear. I may 3d print new cases for my existing units.


I had issues with mine as well (on my dogs). I picked up a couple SmartThings Ziggbee outlet modules to increase my Ziggbee coverage (and control some fans/lamps) and I no longer have issues.


Just opening up the discussion on presence sensor improvements. I am impressed by the design, size, and features of the WigWag (yet unreleased) tag.

@Ben, please consider offering the new enclosures (no guts) for a small price so current users can convert their existing ones to the new, smaller size. I might consider that. I could also see different versions of the enclosure. Maybe one that is magnetic, different colors to help identify them, etc. Given their different usage scenarios (keychain, pet collar, car, backpack/purse, etc), I can definitely imagine different form factors using all the same guts.


+1 for this.

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Has anyone tried placing the electronics in other items, smaller, maybe less conspicuous for your keychain?

I wish they could get them down to the size of a TrackR bravo. Such a nice design

Those are nice. I don’t think we’ll get to that yet for v2 of the tag. Maybe v3 with all the manufacturing know-how of Samsung.

That would be a very cool thing!

I too would love to be able to put this on the collar of each of my three pets!

In the meantime, has anyone come across any non-ST “proximity” tags+readers that would be suitable for pet collars?

If you check the quick browse lists in the community – created wiki, in the project reports section look on the list for “animals” or “pets” projects. There are a couple that discuss dog collar options. :dog:


Thanks JD! A couple of those posts whet my appetite for the AltBeacon stuff. The hurdle to that methodology seems to be finding non-smartphone receivers one could set up around the house.

The least expensive receiver is likely to be some kind of raspberry pi, but that requires some technical skills to set up. @ogiewon or one of the other Maker type folks might be able to say more about this kind of hardware option.

The easiest would be a refurbished unlocked iPhone 5s operating only on Wi-Fi. But those are going to run about $120 each.

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