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Battery-free sensor tag gathers energy from radio frequencies
Sensors play a crucial role in the Internet of Things, but there's one glaring limitation: they need a battery or some other conspicuous power source to run. Soon, however, they might only have to pluck energy from the air. Wiliot has shown off a Bluetooth sensor tag that gathers energy from ambient radio frequencies, whether it's Bluetooth, cellular or WiFi. All the ARM-based chip needs is a basic antenna printed on paper or plastic -- after that, it can transmit info like weight and temperature without any kind of battery involved.
