Scientists use Wi-Fi signals to power camera without battery

Indian Express

Scientists, including one of Indian-origin, have used Wi-Fi signals to power a battery-free camera five metres away, an advance that brings the idea of Internet of things closer to reality.
Internet of things is the concept that almost every object could be fitted with a chip that broadcasts data such as its location or whether some other parameter such as temperature or pressure is dangerously high or low. However, for the Internet of things to become a reality engineers have to solve one potential problem: how to power these numerous tiny machines.