DETECTING PERSONAL ACTIVITY BY MEANS OF BATTERY-POWERED MOTION DETECTORS INCLUDING WIRELESS TRANSMITTERS

摘要

A method of detecting personal activity within a dwelling using at least one battery-powered motion detector connected wirelessly to a control system for transmission of activity reports. Detection of activity starts a minimum reporting period timer and the time of subsequent detected activity is recorded and updated on each subsequent activity. At the expiry of the minimum reporting period, the times of the first and latest detected activities are transmitted to the control system. The detector awaits an acknowledgement from the control system to indicate successful transmission and following receipt of the acknowledgement, the minimum reporting period timer is re-started on detection of the next activity. In this way the number of reports transmitted wirelessly to the control system is reduced so extending battery life.