Development And Application Of An Ultra Low Power Consumption Temperature, Humidity & Dew Point Data Logger

To satisfy the requirements of parameters time-sharing recording such as the air temperature, humidity and other parameters required in the appraised tests and research of heating and air conditioning, building energy conservation ,indoor thermal environment of residential buildings, an intelligent ultra low power consumption thermal environmental parameter data logger specially developed. With these datum we can get the formation of whole system and take effect methods make it running better. This intelligence data logger uses an CMOSens? patent technology temperature & humidity chip SHT11 with characters such as high integrated, subminiature, high accuracy as sensor, takes new ultra low power consumption microchip MSP430F149 from TI Corp. as the core processor, uses large capacity nonvolatile memory stored datum, additionally, it has unique characteristic such as supply power by RS232 while translating datum and double power supply auto-switch, thus extremely reduce system power consumption .The proposed data logger is intelligent with ultra low power consumption, timed data sampling and recording with large memory storage and specially ,several instruments can constitute one off-line measurement system, and is able to communicate with supervisory computer for datum processing and analyzing, can be broadly applied in the HV&AC field and other data acquisition field .The systematic development method of hardware and software for this data logger is detailed in this work. The temperature& humidity measure technical present situation and its sensor development tendency has studied, ideal sensors of this data logger is selected, excellence ultra low power consumption characters of MSP430 is analyzed, then an ultra low power consumption design platform is set up based on MSP430, and the minimum power consumption is realized by means of software hypothesized hardware, the contradiction of velocity and power consumption is settled. An optimal strategy of system low power consumption from components selection, circuit design, software design aspects is brought forward. Double power source supply method proposed, battery power supply usually and when communication and debugging getting the electricity...