Shoe Energy.UniversityofWinsconsinMadisonresearchershave comeuptoproduceenergyfromfootfallsand convertitintoelectricpower.Previousattemptsto makeenergy-harvestingshoeshaveyieldedless than a watt of powerThe new approach could lead to a shoe-mounted generator that produces up to ! watts.Principle:Walking e"erts a lot of force on the heel and toe# and cushioned soles can compress $y a$out a centimeter with every step. Energy harvesters convert this force and displacement into electrical energy.&ell phones and smart phones need a$out one to two watts# while small laptops need ! to ' watts.-Everytimesomeone walksoveratile$yU( startupPavegen Systems#renewa$le energyisharvested from the footstep. -Thetechnology convertsthekinetic energytoelectricity whichcan$estored andusedforavariety of applications.Pie)oelectricityEnergy produced frommechanical pressure.Principle:* single footstep causes pressure when the foot hits the +oor. When the +ooring is engineered with pie)oelectric technology# the electrical charge produced $y that pressure is captured $y +oor sensors# converted to an electrical charge $y pie)o materials ,usually in the form of crystals or ceramics-# then stored and used as a power source.&rowd .arming/n '!!0# two M/T graduate students proposed the idea of installing pie)oelectric +ooring in ur$an areas. 1u$$ed 2 &rowd .arming#2 Principle:Theideawastoinstalla+ooringsystem usingpie)oelectricprinciplesincrowded placessuchastrainstations#malls# concerts and anywhere where large groups of people move.3evolving 1oor. * train station in 4etherlands is using a revolving door manufacturer $y 3oyal 5oon Edam to produce some of the $uilding6s electricity. The train station anticipates the coming and going of patrons to provide 7#8!! kWh of energy per year.Principle:. The revolving door uses a generator to harvest the kinetic energy produced when the door spins.'. * supercapacitor stores the energy. The energy is used to power the train station cafe9s :E1s. ;. When the stored energy from the door is used up# the station9s main energy supply kicks in. The station also displays the amount of energy generated as customers walk in and out.The energy generating revolving door at the 1rie$ergen-