 Locating lost car from remote keyfob
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Conundrum
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Sat Jul 30 2016, 04:44AM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
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Hi all.
One big annoyance with keyfob equipped cars is finding them when in a multi-level car park with lots of similar cars with near identical number plates.
I had a thought about adding some sort of tracker which only activates when it receives a lock signal from the fob (ie within 390 feet) and as this is a safety feature the range is often 2-3* that of the unlock signal.
So far the plan is to add a flash code detector hooked up to the warning lights via an inductive pickup and have it transmit a beacon on 13.56MHz or another license free band.
The circuitry within the remote detects this and when the lock button is pressed turns on and uses alternating colours (orange/blue) to show the approximate bearing and tactile/beeper for distance to the car based on a ferrite composite "flat" antenna of my own design. Security would be to press a user defined code ie lock wait 2 sec lock wait 1 sec lock wait 5 sec to activate the tracker which runs until the car is unlocked to save on battery.
Incidentally this approach would also be handy for tracking a lost/stolen key as the process could be reversed to send out a lock signal once every 23.52 seconds and use a modified FM radio as the tracker.
The fob could also be used to measure car telemetry such as battery state (SG, voltage), remotely activate the lights to deter thieves when triggered, switch on/off the system relay if the battery is really low to let it recover, etc.
This could end up in EPE so watch this space!!
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