Thread: Use bluetooth/RF dongle on keychain for car access

Originally Posted by superart

Well, it would be set to AC automaticly when you are in proximity.

Then push the button to set it to ACC.

AC and ACC?

Originally Posted by Wiredwrx

What do you mean by the LS430 BT. BT is a protocol (I thought). It operates in the high GHZ frequency range.( I am almost positive)

Can't see how creating something will be any easier or cheaper then the link I provided.

A bluetooth wireless modem, and a pic, and a power source (all those are needed to send signals to and from the pic box) will be larger then a regular remote for an alarm. The pic will have to be programed, and the programmer is an added expense. And of course, someone will have to write the code in PBasic. Not that hard to do, but another step that needs to be done.

The pic box receiver is a much easier thing to do, but again, the programmer.

As for touching things. That is interesting. I assume it is the same technology as some of the touch lamps that you can by for your home.

Maybe some research is needed.

Michael

Well, RF signal can be captured and spoofed. And the beauty of having everything programmable is that you can have it to your liking

Originally Posted by superart

Well, it would be set to AC automaticly when you are in proximity.

Then push the button to set it to ACC.

Well, then how would you turn the engine on if the button you press just turns on the ACC?

[Edit]: The LS430 is a Lexus in which I saw the BT system at work.

Originally Posted by 0l33l

Well, RF signal can be captured and spoofed. And the beauty of having everything programmable is that you can have it to your liking

True, but RF is the only way to transmit a signal. Well, strike that, you can have IR, but it can be spoofed as well, and is directional for the most part.

And while it is nice to be able to program things and change them, not allot of people have the ability, and the it increases the cost.

Michael

lol, yea, itd be bad if you are going 100mph+ on the track or the highway, sneeze, bump the under-dash with your knee, and all the sudden your engine dies. Good call on that. Might be cool for a dedicated show car, but definitely not practical.



Wired, the link you posted is good, and definitely easier, but doesnt have as many features as we are discussing.

It doesn't seem to be that hard to program. Ive done PIC assembly before, and I know some C++. It's been a while, but if I read up on it I can prolly do it. Id doesnt seem that hard of a thing to program. Most of the things can be done with just hardware, no programming/minimal programming required.

Originally Posted by Wiredwrx

True, but RF is the only way to transmit a signal. Well, strike that, you can have IR, but it can be spoofed as well, and is directional for the most part.

And while it is nice to be able to program things and change them, not allot of people have the ability, and the it increases the cost.

Michael

I haven't heard of any breakins because of BT RF spoofing. Probably because the code changes every time it talks. Like a walkable frequency. So even if you capture the signal, it wouldn't work if retransmitted. I guess that there is a reason that car manufacturers didn't use RF in this way previously in their cars, although the technology existed a long time ago.

Programming is the best part Adjust distance transmitted, adjust functions, timings, etc.

Daivd... a.k.a. Boris

Originally Posted by 0l33l

Well, then how would you turn the engine on if the button you press just turns on the ACC?

Oh, yea, i got a little mixed up. I thought ACC was the engine on.

AC = just air conditioning
ACC = Air con. and power from batteries
Engine On = ignition to the engine

Is that correct?

Originally Posted by superart

lol, yea, itd be bad if you are going 100mph+ on the track or the highway, sneeze, bump the under-dash with your knee, and all the sudden your engine dies. Good call on that. Might be cool for a dedicated show car, but definitely not practical.

Wired, the link you posted is good, and definitely easier, but doesnt have as many features as we are discussing.

It doesn't seem to be that hard to program. Ive done PIC assembly before, and I know some C++. It's been a while, but if I read up on it I can prolly do it. Id doesnt seem that hard of a thing to program. Most of the things can be done with just hardware, no programming/minimal programming required.

I'd hate to have sneezes that are so violent that they make my knee touch the dash, but I think you get the point.

Still haven't said anything about how to get it from AC to ACC to Engine start. The LS430 uses an extention that is unlocked when the bluetooth is present. It acts just like a normal key, and you can put the normal key in there.

Originally Posted by superart

Oh, yea, i got a little mixed up. I thought ACC was the engine on.

AC = just air conditioning
ACC = Air con. and power from batteries
Engine On = ignition to the engine

Is that correct?

In my car:
AC = clock and radio on
ACC = All car functions ready... all light son dash lit.
Engine On = ignition to engine, and then the key drops back to ACC, which powers all of the components.

hmm, how bout this:

On proximity, the PIC box sends a voltage signal to a toggle switch that is mounted somewhere accessable.

The toggle switch toggles beetween a relay that leads to AC and a relay that leads to ACC.

Then the button does engine start.

Would that work?