Researchers at the Eindhoven University of Technology in Eindhoven, Netherlands have created the world’s smallest temperature sensor chip, but its size isn’t even the most impressive thing about it. The remarkable new temperature sensor is able to draw power from radio waves being broadcast by the same wireless network it uses to communicate. As a result, the chip doesn’t need a battery and never needs to be charged, representing a major leap forward for the Internet of Things and for electronics in general.
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Headed by Eindhoven University of Technology researcher Dr. Hao Gao, project PREMISS is a new type of sensor that could play a major role in the future of consumer electronics. The sensor is as light as a grain of sand and it measures just 2 millimeters square, making it the smallest temperature sensor in the world.
There is no onboard battery and PREMISS doesn’t need to connect to a physical power source of any kind. Instead, the chip is able to draw enough energy from radio waves transmitted by wireless networks to power itself. It also communicates wirelessly over the same radio waves, so it doesn’t need a physical connection to send temperature data to another device.
“The sensor contains an antenna that captures the energy from the router. The sensor stores that energy and, once there is enough, the sensor switches on, measures the temperature and sends a signal to the router,” a post on Eindhoven University of Technology’s blog explains. “This signal has a slightly distinctive frequency, depending on the temperature measured. The router can deduce the temperature from this distinctive frequency.”
