Electronics > Projects, Designs, and Technical Stuff
Sensing an RFID car key?
mzzj:
--- Quote from: langwadt on August 31, 2019, 01:06:14 pm ---
what would be the point of polling other than at startup? don't want the engine to shut driving down the road off just because
the communication with the key is sketchy
--- End quote ---
Theft protection for relay link type attacks?
But yeah, cars I'm familiar keep running even if the "key" is not present after initial startup. Maybe throw a warning.
Keyless system on new Ford Focus gives warning bleeps if you start your car and later leave your keys in the hallway... if you drive off without keys it actually gives you warning after turning off the engine that keys are not present and engine wont re-start after opening the driver side door!
Alex Eisenhut:
I don't get it. You have an area to search but are limited to how close you can get to it? How do you plan on reaching it if you did manage to find it?
Use a Shop Vac over the entire area.
"1000 feet (330 m) surface"
That's a length, not a surface.
mzzj:
--- Quote from: Alex Eisenhut on August 31, 2019, 02:17:41 pm ---I don't get it. You have an area to search but are limited to how close you can get to it? How do you plan on reaching it if you did manage to find it?
Use a Shop Vac over the entire area.
"1000 feet (330 m) surface"
That's a length, not a surface.
--- End quote ---
Lets guess: Thick grass over one square kilometer so you can detect the keys from 30cm away. Or sand. Or snow.
iXod:
It is a physical, classic key with RFID chip in the “handle”.
Other metal is present in the search area so a metal detector, magnet and shop vac are useless.
Area was searched by hand, no joy. But much opportunity to miss a small key.
Thanks to those continuing to offer creative suggestions.
Yansi:
I still vote for the GDO. Try building one and pimp it to perfection, to get the most sensitivity out of it.
Similar concept to metal detection, however in this case specifically at 125kHz to detect the resonant circuit in the transponder.
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