RF Time of flight distance measurement for position location using Arduino
- Superb & arcane - he is pushing what he has far above normal
capabilities. Very intelligent application of laws of Physics.
Adam Fabio posted: "If you carry a cell phone with GPS, you always know
where you are on the planet. But what about inside buildings or even your
own home? Knowing if you're in the kitchen or the living room would be a
great feature for home automation systems. Lights could " Respond to
this post by replying above this line
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Trinket
uses RF to track you through the house
by
Adam Fabio
If you carry a cell phone with GPS, you always know where you are on the
planet. But what about inside buildings or even your own home? Knowing if
you're in the kitchen or the living room would be a great feature for home
automation systems. Lights could come on as you enter the room and your
music could follow you on the home audio system. This is exactly the what
[Eric] is working on with his Radiolocation using a Pocket Size Transceiver
project. [Eric] started this project as an
entry in the Trinket Everyday Carry Contest. He didn't make the top 3, but
was one of the fierce competitors who made the competition very hard to
judge!
The heart of the project is determining Time Of Flight
(TOF) for a radio signal.
Since radio waves move at the speed of light, this is no small feat for an
Arduino based design! [Eric] isn't re-inventing the wheel though - he's
basing his design on several research papers, which he's linked to his
project description . Time of
flight calculations get easier to handle when calculating round trip times
rather than one way. To handle this, one or more base stations send out
pings, which are received and returned by small transponders worn by a
user. By averaging over many round trip transmissions, a distance
estimation can be calculated.
[Eric] used a Pro Trinket as his mobile transponder, while an Arduino Micro
with it's 16 bit counter acted as the base station. For RF, he used the
popular Nordic nRF24L01+ 2.4 GHz transceiver modules. Even with this
simple hardware, he's achieved great results. So far he can display
distance between base and transponder on a graph. Not bad for a DIY
transponder so small if fits in a 2xAAA battery case! [Eric's] next task is
working through multipath issues, and testing out multiple base stations.
Click past the break to see [Eric's] project in action!
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*Adam Fabio * | January 24, 2015
at 10:00 am | Tags: hackaday.io ,
radar , Radicalization
, Trinket EDC contest
| Categories: Arduino Hack=
s
, contests
| URL: http://wp.me/pk3lN-BCG
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