Using a variety of temperature measurement element 3 channel closed-loop temperature control system design Electronic engineering first, using three kinds of temperature measurement devices designed for basic two-stage temperature control system on smaller while three temperature control execution unit to implement a closed-loop temperature control, temperature range: 0 ℃-100 ℃. Three kinds of temperature measurement devices are platinum resistance temperature sensor pt100, T-type thermocouple temperature sensor and digital line thermometer DS18B20. Temperature control execution unit for semiconductor refrigeration tablets. Contrast electronic engineering design phase has been completed the first and second temperature control system, the difference lies in the content of the project: for temperature measurement devices designed signal processing circuit and a new data collection method used to increase the two analog/digital converter channels and three the number of D/A converter c

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