Our aim is to make use of micro-nanotechnologies to obtain micro-nanodevices built from microstructures with an architecture that confers them an added functionality (resonant structures, thermal isolated structures, 3D topography...) and on occasions the synthesis of sensitive or functional materials that allow interaction with the environment. In this way, transducing physical or chemical phenomena into electricity, both information and energy can be obtained from the surroundings leading to sensors, micro-energy sources and, eventually, autonomous or self-powered sensors.