Patent ID: 7784707
Filing Date: 2010-08-31
Classification: G01D

Abstract:
1. A device comprising: a temperature sensor; a light sensor; a rewriteable memory that stores environmental condition data including temperature data from the temperature sensor and indications of a door status of a container based on a light intensity measured by the light sensor; a wireless communication module that transmits the stored environmental condition data including temperature data and indications of the door status of the container; and a control module, wherein the control module reads a current temperature from the temperature sensor and a current light condition from the light sensor at periodic intervals, and at those periodic intervals in which at least one of the current temperature and the current light condition changes since a most-recent previous reading, the control module data records the current temperature and the current light condition as the environmental condition data in the rewriteable memory, wherein the control module issues an alert when a temperature reading is outside acceptable limits and the door status is a closed-door status, and the control module does not issue the alert when the temperature reading is outside acceptable limits and the door status is an open-door status.