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# The OpenSense Measurement Box
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The OpenSense measurement platform is based on the prototype platform developed within the [Nano-Tera](http://www.nano-tera.ch/) project [X-Sense](http://www.nano-tera.ch/projects/414.php) (as part of the cooperation between the projects) and further extended for monitoring air pollution. The core of the prototype measurement station is a [Gumstix](http://www.gumstix.com/) embedded computer running the Linux operating system. The station supports GPRS/UMTS and WLAN for communication and data transfer. A GPS receiver supplies the station with precise geospatial information. Localization in cities is a challenging task due to street canyons, multi-path effects, and often low number of directly visible satellites. Thus, the measurement station is equipped with an accelerometer and receives the door release signal once installed on a tram to assist recognition of halts and tram stops to minimize the positioning uncertainty. The weight of the developed OpenSense station is approximately 4.5kg and energy consumption is 40W. The station is supplied with power from the tram.
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... | ... | @@ -45,3 +47,5 @@ Besides the deployments described above, we also have a two prototypical impleme |
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1. A smartphone-based measurement device. We connected a small-sized, low-cost ozone sensor to an off-the-shelf smartphone running the Android OS. The Android application assists the user with sensor calibration, displays sensor readings, stores them on the memory card, and uploads the stored data to a server for further data processing and visaulization.
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2. A wearable measurement device in the form of smartwatch. Two metaloxide gas sensors are used to measure volatile organic compounds (VOC) while the user is indoors and ozone (O3) while the user is outdoors.
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Due to potential interference from the user on the gas sensor devices we also apply a tailor-made neural network based calibration process which is running on the users smartphone.
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