Unlocking a car with your brain - Page 1
Forum section: electronics / projects

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: April 29, 2014, 01:25:43 pm
content: Not sure of the date on this. Hope it isn't April 1. I haven't tested this.He seems to be saying the electric field from the transmitter makes another transmitter somehow. It doesn't make much sense to me.When I first thought about it I thought it must be a reflection or multipath or yagi effect, or alternatively the water providing a better ground plane.Could somebody explain the mechanism?

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 29, 2014, 02:18:50 pm
content: and he must ensure he steal it alive. a dead brain will not do any good, well except if you are some tribe in the amazon jungle.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: April 29, 2014, 02:22:41 pm
content: I found this on NY times.QuoteSo the link is capacitive so that explains it, seems reasonable.Somebody else suggested the holding the key higher because it is near your head is helping.ps. I'm not sure brains are worth more than cars, my boss doesn't seem to think so anyway.

author: PA0PBZ
author_rank: Super Contributor
timestamp: April 29, 2014, 02:39:59 pm
content: QuoteI have yet to see a key where the metal part is used as antenna, all keys i've seen had a pcb antenna.

author: wkb
author_rank: Super Contributor
timestamp: April 29, 2014, 09:36:29 pm
content: Hm... sure would help fight congestion. Given that the average road-moron does not have much brain to start with it wouldprevent a lot of cars from getting onto the street in the first place.....

author: gregariz
author_rank: Frequent Contributor
timestamp: April 29, 2014, 09:52:42 pm
content: At 300MHz (1m) the efficiency of a little keyfob antenna is pretty shite, even more so with your hand wrapped around it. I could well believe that it wouldn't take much of an improvised antenna to improve the situation.

author: IanB
author_rank: Super Contributor
timestamp: April 29, 2014, 10:04:08 pm
content: See this thread:Never mind fractal antennae how about using your brain as one

author: Rick Law
author_rank: Super Contributor
timestamp: April 30, 2014, 03:22:53 am
content: Quote from: Mechatrommer on April 29, 2014, 02:18:50 pmWhy?As I understand, much of the information is coded by in how the neurons are connected. Not unlike an mcu/FPGA storing setup with "what fuses are fried" leaving what remains connected. So, in theory, the structure of the brain itself can be decoded to arrive at the stored information, dead or alive. Using that information, the brain waves and the stored knowledge could be readily available.But, worry not, our secrets are still secrets - by the time that brain hacking technology arrives, I am sure most of us have brains already rotted to the bones and most of the molecules that made up "us" would have already been recycled. By then, we don't care even if there is a 3D replica of our brain with every neuron in the right position, connected to what it used to connect to, in what we once called our own brain.

author: pickle9000
author_rank: Super Contributor
timestamp: April 30, 2014, 04:01:35 am
content: There was an interesting experiment in the late 90's.http://en.wikipedia.org/wiki/God_helmet

author: Teledog
author_rank: Regular Contributor
timestamp: April 30, 2014, 04:41:16 am
content: The key FOB isn't exactly an ideal antenna..at ~300MHz.If his head/body (antenna) was ~1 meter he'd have great distance!Wavelength is~ 300/Frequency in MHzGF gets pissed at me when I run the HP SG @ 315 w/a few kHz deviation ;P.. (key FOB & garage opener are deaf)

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: April 30, 2014, 06:20:31 am
content: Sorry didn't realise it was already a thread, only 6 weeks old. I even searched before I posted.https://www.eevblog.com/forum/chat/never-mind-fractal-antennae-how-about-using-your-brain-as-one-%29/previous link broken.I tried it today, it did work.

author: miguelvp
author_rank: Super Contributor
timestamp: April 30, 2014, 06:23:27 am
content: Quote from: HackedFridgeMagnet on April 30, 2014, 06:20:31 amSure, but what about the rest of us that are not hacked fridge magnets?I mean the magnetic field must make a difference

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: April 30, 2014, 06:26:07 am
content: What u saying? Fridge Magnets don't count?

author: vk6zgo
author_rank: Super Contributor
timestamp: April 30, 2014, 07:10:10 am
content: What a load of old bollocks!As an experiment,it is poorly conceived & carried out.The orientation of the key fob is different when he uses it in a normal manner,& when he uses it poking his head.Depending upon the polarisation of the two antennas,he could lose up to 20dB of gain with antenna orientation.Where is the receive antenna on this particular car?Possibly,it was less obscured when he was doing the "head poking" thing-------different angle?The water didn't do a thing until he placed it on his head---- again perhaps a clearer path to the car?Where was the control test with an empty bottle?An empty head might have been more difficult to organise!Interestingly,we never really experiment with the best orientation of the key fob in normal use,so we don't have a baseline to work from.There are a few imponderables:-I was playing around with a loop & RF detector to see if I could see the detected signal from a keyfob.My wife yelled at me,because with the fob lying on the bench in the back of the house,it consistently unlocked & relocked the car at the front.Sometimes,it battles to work at half that distance in a car park,in line of sight to the car.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: May 01, 2014, 07:46:55 am
content: QuoteOk after a bit more testing I agree with vk6zgo.Tried to get consistent results in different positions, orientations, near the head etc.The only consistencies I could get are explainable, and nothing to do with the head.ie. Range, clear path, height ie. Normal Fresnel stuff.And multipath nulls. The nulls were fixed by moving the position a fraction of a wavelength.Oh well, not sure what they are doing at Uni of Nottingham apart from practical jokes.

author: Joule Thief
author_rank: Regular Contributor
timestamp: May 01, 2014, 08:14:31 am
content: I have seen this method work time and time again

author: SeanB
author_rank: Super Contributor
timestamp: May 01, 2014, 11:24:05 am
content: Fire extinguisher does work very well from my experience.