Using the NRF for presence detection
-
I am still sorting things out in my head, and have more ideas then skills to know if they are possible. Anyways, here goes:
I was looking for a reliable way of knowing that members of my family are home. not all of them carry smartphones so ping will not work. Passive rfid is detectable only for few cent distance and active rfid readers/tags would have been perfect but for the price which is ~200$/reader.
I have noticed that the active rfid readers actually use the same chip mysensors use and I was wondering if the gateway can sense the active RFID tags presence? I guess we can build sensors that will act pretty much like tags but making them small will be a pain.
Any other ideas or thought will be most welcome.
Moshe
-
This could be a good start https://github.com/solarkennedy/equail
-
@Andreas-Maurer fascinating project that one.... however not in the right direction. the tags should be as small and energy efficient as possible, something like these http://www.aliexpress.com/item/2-4ghz-active-rfid-tag-long-rang-active-rfid-tag-2-4ghz-rifd-tag/1154460046.html
-
@Andreas-Maurer this on is also interesting http://www.ns-tech.co.uk/blog/2010/02/active-rfid-tracking-system/
-
Hi.
I have in project to build a breadboard for this chip, to see what it can do. I have ordered samples.
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00031737.pdf
maybe this chip could be interesting for your project....
-
I asked a question like this about a year ago and got some responses, and have not followed up and actually tried what Hek had recommended. If this can help you great.
http://forum.mysensors.org/topic/209/how-would-you-do-something-like-a-smartsense-presence-sensor
-
@gbfromhb yep, about the same track i think, and I am sure many others will agree. the main problem is the "form factor". and MYS sensors tend to be a little bigger and a little more power hungry than the commercial tags, I was just wondering if there is a possibility of having a node or the gateway communicate with these tags as they are using the same chip. Murphies laws taken into account, the answer is probably no but I am really out of my depth here with all these specs, like the one @scalz posted. while this looks really promising, I have no idea what the range is (I suspect short as this is 13.5mhz but really don't know) and I also have no idea what so ever what to do with a chip like that.
I guess a sensebender with a button cell battery and nrf chip would be ok but a bit of overkill and a case would be hard to find. maybe moulded in sugru....
-
yes. i was thinking about things like that!
can't tell anything about this chip, i ve just ordered sample. but it looks interesting. I am curious.
-
I'm much more of a software guy then a hardware guy. This is probable one of the reasons I have not moved forward with this. I was trying to find the path of least adventure, but at least get something that could work. Following Hek's recomendation I was going to create a controller board using the same chip the senseboard is using as the base. Use a coin battery and the following radio, and hope it may work without much software change.
http://ebay.com/itm/370838324247
I was hoping it could get to the size of a big thing on your key ring, or a small altoids container.
-
Just to re-iterate my original question - does any of the forum heroes knows if the same nrf chip can be used for rfid detection of commercial active tags and for mysensors?
