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Thermocouples are widely used in the temperature during the temperature sensor , it will convert heat to electricity using thermoelectric power generated to measure temperature. However, during operation of the thermocouple heat generated voltage is only uV magnitude, it is susceptible to interference from the surrounding electromagnetic signals , resulting in measurement errors. This research and development of anti thermocouple temperature control , from the circuit design, PCB board layout , the software design, etc., interference with the work of the thermocouple signal filtering processing, the temperature of the thermocouple is in complex electromagnetic environment, stable and reliable work . In circuit design , in order to improve measurement accuracy , the need for thermocouple cold junction compensation to make up for thermocouple cold junction at room temperature caused by the error ; the PCB circuit design, from the power supply , cables , PCB three level dual thermostat for the tropics anti-jamming design ; in the software design process, the use of digital filtering techniques further interference signal filtering, and using linear interpolation method for solving temperature values ??, and finally with fuzzy temperature control algorithm to control the ambient temperature .
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