For next week High Tech fair here in Tampere Finland I have just made a
GSM phone operated
Coca-Cola controller for a local GSM phone manufacture.
You can send a short, ready made messages for different cans and when
you approach vending machine, it pops
right can to you without change money in hand ( you pay it with you
phone bill)

You can use temperature and storage status before, so you do not have to
go for empty vending machine.
It uses a standard PIC + NOKIA GSM modem. Very simple.

Pekka

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Pekka Ritamaki, Probyte Oy Microprocessor software & hardware design
Nirvankatu 31, 33820 TAMPERE, FINLAND http://www.sci.fi/~pri
tel: Int. 358-3-2661885 fax: Int. +358-3-2661886