Rfid
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ideally we'd like to have passive tags on all important eqpt and be able to read it from far away e.g. 5-10m.
It looks like UHF passive tags / gen2 can approach this performance
http://skyrfid.com/RFID_Tag_Read_Ranges.php
Research
- Active tag, 25 dollars, open design: https://www.openbeacon.org/device.html