| General > General Technical Chat |
| Has anyone for lost keys made thwier own tracking ID or lost pills |
| (1/1) |
| Beamin:
Or is the technology so small that its out of scope of the ee... I want a sugar vube box I can set my keys or pills |
| Beamin:
edit i lost my cotacts |
| Beamin:
--- Quote from: evb149 on September 10, 2021, 03:48:40 am ---ble is usually used for near range (0-10m, 20m+ maybe with different design and environment criteria) lost item or asset location tags. The RF modules are off the shell small like 10mm x 10mm or whatever commonly, but the product size is usually limited by the antenna which itself is ideally (for efficiency but not necessarily made so for compactness) bigger than either the IC module / electronics / or the battery) and limited as much or more so by the battery size. You already know of the common sizes of coin cells, 20mm x 1.6mm or so at least for the good ones that will last a fair while. The watch / hearing aid ones don't last nearly as long or have nearly the energy capacity but one could get something barely working for a few days or whatever with a couple of those kind.. 2V is about the minimum most chips take to operate fully, about 5-15mA peaks when transmitting or receiving which is as much or more than a lot of the really small cells can put out when they're fresh and warm. So mostly you end up with something the size of a car RF door opener keychain fob or similar with a coin cell and chip and 10-20mm major diameter antenna of some sort. Then one has to have a way for the thing to activate usefully while due to power budget it will really have to be inertly asleep doing nothing but waiting for a timer 99.9% of the time. Maybe wake up a couple times a minute or even significantly less to look for an "I lost something" message beacon somehow and only then would it transmit anything. Just buy a little BLE module with a built in antenna from any one of the electronics distributors and that along with a 2016 / 2032 Li coin cell will be programmable to be an lost item / asset tag as above that can work with any smart phone or PC or similar that has BLE 4.x or higher built in. Then there's the ESD protection, enclosure, moisture / dirt protection, a way to change the battery, etc. etc. Trivial electronics / software, harder mechanical and packaging and power and compact but adequate antenna design. One might almost be better off ditching BLE for a little nanopower MCU and some other kind of "in room broadcast" reception ability to let it know it should send out a ping. --- End quote --- Do they make small devices you are talking about like the size of a car fob I could attach to important objects then hide them away. To find would be an app on the phone. I unfortunately have no ability to bui;d an app so I would have to find a commercial one. I dont even know what you would search for on google. I do remember these white squares about 1"x1"X 1/4" that you could use to track things but I have no idea what they are called or how they work. This was a few years ago when I read an article on security vulnerabilities of the device, but that doesnt bother me. |
| kripton2035:
apple sells it's "airtags" made exactly for that. |
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