The use of context in mobile devices is receiving increasing attention in mobile and ubiquitous computing research. In this article we consider how to augment mobile devices with awareness of their environment and situation as context. Most work to date has been based on integration of generic sensor, in particular for positioning and for vision. We propose the integration of diverse simple sensors as alternative, aimed at awareness of situational context that can not be inferred from location, and targeted at resource constraint device platforms that typically do not permit processing of visual context. We have investigated multi-sensor contextawareness in a series of project and report experience from development of a number of device prototypes. These include development of an awareness module used for augmentation of a mobile phone, of the Mediacup exemplifying context-enabled everyday artefacts, and of the Smart-Its platform for aware mobile devices. The prototypes have been explored in a range of applications, to validate the multi-sensor approach to awareness, but moreover to develop new perspectives of how embedded context-awareness can be applied in mobile and ubiquitous computing
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