to build a small city one must do 3 things connected devices collect data and assess this data to find solution for the citizens but how do i benefit from the smart city here. in. the city says. taxes by using resources more efficiently with the help of sensors public spaces are only irrigated when they re too dry. the garbage bins are only emptied once they re full. in helsinki garbage trucks have become obsolete waste is transferred to underground collection points without noise or pollution. in rio de janeiro a smartphone app is enabling residents to shape their surroundings the app smart favela create a 3 dimensional avatar of the shantytowns when city planners come up with new ideas these can be looked at on the app and then citizens can vote on them.