Beer mat knows when it is refill time
From: CNN - 09/30/2005
By: Julie Clothier for CNN

Two German students have created a device that will stop beer lovers having
to get out of their seats for a refill. 

The "smart" beer mat, created by Matthias Hahnen and Robert Doerr from
Saarland University in Saarbruecken, southwest Germany, can sense when a
glass is nearly empty, sending an alert to a central computer behind the bar
so waiters know there are thirsty customers. 

The students' supervising professor, Andreas Butz, told CNN the plastic beer
mat had sensor chips, which measured the weight of the glass, embedded inside. 

When the weight of the glass drops to a certain level, the sensor chips
detect that it is close to empty and alerts the bartender via a radio signal. 

"You could have hundreds of beer glasses in the bar and the beer mat would,
for example, tell the bartender, 'table 14 needs a refill,' " Butz told CNN. 

Unlike the usual cardboard beer mats, the invention is made out of plastic,
which means it does not absorb water. 

Butz said that to get around the problem, ordinary cardboard mats could be
placed on top of the plastic version to absorb liquid and display advertising. 

"Cardboard beer mats could still sit on top of the plastic mat and there
could still be advertising, and you would just exchange the cardboard mat
when you wanted to change the advertising."  

The chips inside the mat also measure gravity, and know when the glass has
been turned upside down, Butz said. 

This could be used as a "voting system" during karaoke competitions: patrons
could raise their glass if they liked a singer, or flip it over if they did
not, Butz said. 

"You could argue that the voting system is more likely to be positive because
people would be sipping their glasses during the course of the song but this
would just add to a more positive atmosphere in the pub," he said. 

Butz, who now works as professor of computer science at the University of
Munich, specializes in human computer interaction. He and Michael Schmitz, of
Saarland University, presented the idea at the International Conference on
Ubiquitous Computing in Tokyo earlier this month. 

Butz believed it had potential to become a commercial reality. 

"It's a funny idea but the nice thing about it is these students have
followed it through right to the end. They've come up with the idea but they
have made it practical -- it is even dishwasher-proof," he said. 

"They have driven the product all the way to the end. If a brewery came to us
now, we could produce something for them in a few months."

Links:
"Design and applications of a beer mat for pub interaction", in: Proceedings
of Ubicomp 2005,  September 11-14, 2005, Tokyo, Japan
http://www.butz.org/publications/papers/Ubicomp05-beermat.pdf
http://w5.cs.uni-sb.de/~butz/publications/papers/Ubicomp05-beermat.pdf
http://w5.cs.uni-sb.de/~schmitz/publications/ubiposter.pdf

Interactive beer mat
http://www.we-make-money-not-art.com/index.php?page=2

Hi-tech beermat tells barman it's time for a refill
http://news.lycos.co.uk/querkies/050928184437.qtgfr4e2.xml.html

Contributed by Jamie Prioli