The goal of the Micro- and Nanosystems group's contribution to the X-Sense 2 project is to enable long term autonomous structural monitoring by developing an event driven ultra-low idle power acoustic emission trigger. We hope to achieve a reduced data rate and overall power consumption while preserving the meaningful part of the data. My research activity focuses on the ultra-low idle power electro-mechanical transduction mechanism needed to transform the signal from the mechanical to the electrical domain.