A research team from University of Michigan has created miniature generators which can make energy from random street noise.
Researchers at the University of Michigan have developed miniature generators that could produce electricity from random street noise. Called the Parametric Frequency Increased Generators, these small batteries use energy emanating from non-periodic vibrations caused by sounds like heavy traffic on roads or people walking up the stairs.
The researchers have already built a few prototypes which can produce up to 0.5 milliwatts of power, enough to run a watch or a pacemaker. Some of the future possibilities of these generators could be powering wireless sensors in buildings to make them energy efficient or in public spaces to monitor for pollutants.