Researchers at Eindhoven
University of Technology claim that such sensors could help advance the
nascent IoT industry. Increasingly tiny chips that measure temperature,
light, and air pollution are being deployed around cities and in smart
homes and offices. One the biggest hurdles is to make these sensors
battery-free.
"We don't want hundreds of these sensors
around our homes if we have to go around swapping the batteries all the
time," said lead researcher Prof Peter Baltus. The sensor
developed by his team measures temperature but similar sensors that
measure light, movement and humidity could also be developed.
The sensor
measures just 2 sq mm and weighs 1.6mg. It contains an antenna that
captures energy from a wireless router, it stores the energy and, once
there is enough, is able to measure the temperature and send a signal to
the router.
Currently the chip has a tiny range -
just 2.5cm but the researchers are confident that this can be extended
to 1m. "Theoretically it can work up to 5m," said Prof Baltus.
The sensor
can operate beneath a layer of paint, plastic or concrete - making it
ideal for incorporation into buildings. It is also cheap and, according
to Prof Baltus, the cost of an individual chip would be around 20 cents.
According to Gartner, the Internet of
Things market is set to explode. It predicts that cities will have 1.6
billion connected things, 518 million smart buildings, and one billion
homes in 2016.
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