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Re: [OT] Dart tag, how does it work..
- Subject: Re: [OT] Dart tag, how does it work..
- From: Ian Oliver <lists@xxxxxxxxxxxxx>
- Date: Thu, 12 Aug 2004 14:32:29 +0100
In article <ABCE1E257129D411820D00508BC2645A03CC13E1@bancteceu1>,
Peter
White wrote:
> I installed a 'PAC token' access
> system at my last place, but their range was only a couple of foot (at
> best). No battery involved, I think by bombarding the tag with
um...waves
> of some sort (microwaves?), that generates enough energy for the tag
to
> identify itself to the sensor.
If you open them up (a nice hot wash does this!) you find they have a wire
loop around the edge, which I guess is powered inductively. They then have
a
chip in the middle that transmits the code via a couple of small wire
aerials.
Ian Oliver
Sunny Leeds, UK
Using Java on Tini for control via Dallas 1-wire
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