| Sumario: | Purpose Aging people with cognitive impairment often require automated prompting of daily activities1. There are usually given based upon a schedule and do not take into account the location of the user. Schedule based ADL prompting can be inefficient if the recipient is not near the location where the action is performed, since the prompt may be forgotten before the user reaches the location. Smartwatches have been popularized by their ability to pervasively prompt users. Yet their ability to prompt indoors based on location has not been fully actualized2. In this paper, we present the Ubiwatch, which resolves the user's indoor location to 20cm in 3 dimensions using Ultra-wideband (UWB) radio and enables two-way communication while prompting using audio, vibratory, colored display and short text strings contingent on schedule and/or location. Method Ubiwatch is shown in Figure 1 with PCB presented in Figure 2. Ubiwatch contains an active radio transponder designed to work with Ubisense sensors that derive coordinate data from monitored indoor spaces. The 2.4GHz radio allows the wearer to be located outdoors or beyond the range of the UWB infrastructure and allows the wearer to send a distress message. Two volunteers wore Ubiwatch and a standard Ubisense 'compact tag' for X and Y calibration, generating 3,770 and 12,338 pairs of observations over 5 hours. Results & Discussion Correlation coefficients computed between the devices ranged from 0.92 to 0.99 for X and 0.99 to 0.99 for Y and mean positional disagreements for each system ranged from 7-9cm for X and 3-4cm for Y. Figure 3 presents tracking data obtained by a subject wearing Ubiwatch. The tracking data gathered from Ubiwatch can be used to estimate fall risk3 on a walking path. Ubiwatch's ability to measure altitude (Z) may be useful in detecting falls4 and notifying caregivers. A video of Ubiwatch is available5. Data is currently being collected on Ubiwatch's ability to prompt behavior. However none are available at the time of publication.
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