Embedded sensor system and techniques to evaluate the comfort in public transportation

This paper shows an embedded measurement system based in tri-axial accelerometers, global positioning systems (GPS) and a temperature sensor supported by wireless communication and SD Card storage and beyond, the application of three sensor system algorithms to measure the comfort in public transportation. The first algorithm is based on the detection of acceleration´s peaks over threshold values produced by reckless driving, holes, speed bumps or others defects. The second one adds the detection of acceleration changes (Jerk) peaks over 0.4m/s³; whereas, the third one adds the RMS measurement from frequency-weighted accelerations following the standard ISO2631-1. Finally, all the algorithms report the time, type, magnitude, and geographic position of the event in a LabVIEW™ interface using a Google™ online map.