Battery-powered wireless long life temperature and humidity sensor module
AssigneeArchimedes Controls Corp.
InventorsLiangcai TAN, Wenli YU, Xin HU
Life of this patent
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Abstract
An adaptive algorithm based battery-powered long distance wireless temperature and humidity sensor module. The sensor module uses an adaptive algorithm to transmit data on an event basis and/or a reduced basis to extend battery life to more than 10 years. It also uses a low power wireless transmitter which has frequency of sub-1 GHz and an effective transfer distance of up to 250 meters, a low power temperature and humidity sensor, and a long lasting lithium battery which has shelf life of 20 years.
Claims20
A battery-powered wireless sensor module for measuring air temperature and relative humidity and for wirelessly transmitting data to a sensor controller, comprising:
- a temperature and humidity sensor for sensing air temperature and relative humidity and for sending data to the processor;
- a memory comprising an adaptive algorithm for controlling transmission of the data from the wireless sensor module to the sensor controller based on changes in the temperature or relative humidity, wherein the adaptive algorithm is configured to be executable by the processor to cause the wireless sensor module to:
- measure a current temperature and a current relative humidity using the temperature and humidity sensor;
- determine whether an absolute value of a difference between a previous temperature and the current temperate is greater than a temperature set point;
- determine whether an absolute value of a difference between a previous relative humidity and the current relative humidity is greater than a humidity set point;
- if the absolute value of the difference between the previous temperature and the current temperate is determined to be greater than the temperature set point or if the absolute value of the difference between the previous relative humidity and the current relative humidity is determined to be greater than the humidity set point, transmit the data from the wireless sensor module to the sensor controller;
- and
- if the absolute value of the difference between the previous temperature and the current temperate is determined to be less than the temperature set point and if the absolute value of the difference between the previous relative humidity and the current relative humidity is determined to be less than the humidity set point, transmit the data from the wireless sensor module to the sensor controller if a time since a last transmission of the data is determined to be greater than a maximum value.
A method for measuring air temperature and relative humidity and for wirelessly transmitting data to a sensor controller, comprising:
- at a battery-powered wireless sensor module:
- measuring a current temperature and a current relative humidity;
- determining whether an absolute value of a difference between a previous temperature and the current temperate is greater than a temperature set point;
- determining whether an absolute value of a difference between a previous relative humidity and the current relative humidity is greater than a humidity set point;
- if the absolute value of the difference between the previous temperature and the current temperate is determined to be greater than the temperature set point or if the absolute value of the difference between the previous relative humidity and the current relative humidity is determined to be greater than the humidity set point, transmitting the data from the wireless sensor module to the sensor controller;
- and
- if the absolute value of the difference between the previous temperature and the current temperate is determined to be less than the temperature set point and if the absolute value of the difference between the previous relative humidity and the current relative humidity is determined to be less than the humidity set point, transmitting the data from the wireless sensor module to the sensor controller if a time since a last transmission of the data is determined to be greater than a maximum value.
Dependencies are inferred from the claim text.