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

if you have an LED, go for it.

whatever is the most distinct.

Originally Posted by superart

if you have an LED, go for it.

whatever is the most distinct.

I'm saying that its much easier in both software and hardware to hack into the LED. I've got both an LED and a siren for my alarm. Its just that using the LED would make it easier to design the PIC.

cool, whatever works.

I just meant to say that you should patch into some sort of signal that indicates weather the alarm is armed or not.

if the LED is easiest, go with that.

Originally Posted by superart

cool, whatever works.

I just meant to say that you should patch into some sort of signal that indicates weather the alarm is armed or not.

if the LED is easiest, go with that.

Ok, so we're on the same page now.

I'm gonna go sleep. We should think about how to interface this with BT cellphones, because it will make the design much easier (one less hardware thing to worry about). But it has to be fast with cellphones. I don't want to wait 30 seconds for an app to load to pop my trunk

yea, im going to sleep too.

I dont really have any experience with BT cell phones, and my phone doesnt have BT anyway, so I wouldn't have a platform to develope on even if i did.

Although a cell phone would have much more options and be more customizeable than a simple little dongle with a PIC and a couple buttons. And 1 less thing to cary arround.

Of course, the cons are, you are more likely to leave your cell phone at home than you are to leave your keys. And if you forget to charge your phone at night, good luck getting to work in the morning. hehehe.

Originally Posted by superart

yea, the PIC box we have been talking about for like a while now.

<edit>
woot!!! 100th post!!!!!

I am teh win

dude- you only have 70 posts...?

on this thread, i meant

ahh.

I like the sound of this project. But i don't think you need blue tooth at all. What you would use is a transponder device (RFID).
Basically how it works is that you have a controll device which emitts a frequency which remotly powers the transponder key (if in range). When powered the transponder emitts its own code. from the ere the controll device takes that code and spits to whatever. This sort of thing is used for security tagging, door locks (both buildings and cars).

So you could just use a controller interfaced with a PIC which controlls whatever it needs to. The range is limited to what the transponder key can emitt.

Some links:
http://www.rfidinc.com/
http://www.avea.cc/DIY.htm
http://www.ti.com/rfid/default.htm
http://www.secureorderprocess.com/ti/products.asp