>Go to the Maxim website, has all the info on Ibuttons there :o)
 >
 >I believe there is nothing in the reader, just the PC interface in the D25
 >and D9 plugs to change the +5V signal to RS232 levels :o) (maybe a bit of
 >ESD protection too)

Further to this, Maxim/Dallas also have iButton development kits available
as a free sample. :o)

The Thermocron kit is great and very interesting to play with.  My freezer
runs at a very chilly -15C and it was interesting to see the compressor
kicking in at regular intervals.

Regards
Jean-Michel.

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