BLE Asset Tracker User Guide
T0005946_UG
Version 1.1
TEKTELIC Communications Inc.
Confidential
Page 11 of 21
1.2.2
Accelerometer Transducer
Acceleration sensing is provided by an integrated 3-axis accelerometer which can be disabled to
conserve battery life.
The main role of the accelerometer in the Tracker is to detect motion that can
indicate a change of the Tracker
’s
status from stillness to mobility, or vice versa. In this role, the
accelerometer generates an acceleration alarm when a motion event is detected that may or may
not be reported OTA (user-configurable).
An acceleration event report is based on exceeding a defined acceleration alarm threshold count
in a defined alarm threshold period. These thresholds can be customized such that there will not
be multiple reports for a single event, depending on the definition of an event in a particular use
case.
An alarm event can only be registered after a configurable grace period elapses since the last
registered alarm event. Carefully setting the grace period is important and prevents from repeatedly
registering an accelerometer event.
The accelerometer can also be polled periodically for its output acceleration vector for applications
in which the Tracker orientation is of interest.
1.2.3
Temperature Transducer
The Tracker includes an on-board thermometer that functions with the specifications listed in
Table 1-2 and supports threshold-based transmission. The temperature is measured from the
built-in MCU transducer. When the temperature thresholds are enabled, the Tracker reports the
temperature when it leaves the configured threshold window, and once again when the
temperature re-enters the threshold window. The Threshold mode is compatible with periodic
reporting of the temperature.
