Wireless sensors can be used to monitor a building’s water usage and power consumption, they can be used to predict when a machine needs maintenance, when a pipe might burst, stop you getting sunburnt, and even alert parents’ if baby needs changing.
These sensors make up an Internet of Things that is growing by the day. By 2020, Gartner predicts there will be over 26 billion connected devices, a huge proportion of them small simple sensors.
But what happens when a sensor’s battery runs out?
