This tiny temperature sensor does not require any battery to power it

Scientists have developed a tiny, wireless temperature sensor which is powered by the radio waves that are part of the device’s own network. Hao Gao, researcher at the Eindhoven University of Technology in the Netherlands, developed the sensor that measures just 2 square millimetres and weights a mere 1.6 milligrammes, equivalent to a grain of sand. The sensor has a specially developed router, with an antenna that sends radio waves to the sensors to power them. This makes the sensor easy to incorporate in buildings, for instance by ‘painting’ it onto the wall with the latex, Peter Baltus, TU/e professor of wireless technology, said.