Kenn Humborg wrote:
>> I'd like to find a little battery-powered device that I
> could carry around in my pocket/coat/wallet that would
> let my home Linux box know when I'm in the house.
>> (The "itch" is that I don't want my email downloaded from
> the ISP when I'm not there, only when I'm actually in the
>> Anyone know of any really low-power devices that might be
> suitable? I'm not afraid of a bit of hardware/software
> hackery to get it working :-)
Something based on Dallas Semi's iButton might be what you
want - their simplest devices have just a 64-bit unique code
in a ROM that is read out through a 1-wire interface. More
complex ones have microprocessors. The snag is that there
doesn't seem to be any way of transferring info. without
touching the iButton off a receiver - i.e. it's not wireless.
Maybe you could hack something up with a 433MHz radio module
which would transmit the code every so often.
Check out www.ibutton.com
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