The system of temperature control basing MCU
Abstract :This design uses a microcontroller (89S51) as a core control for a water temperature control system f to achieve artificial settings, automatic control of temperature, the real-time display water temperature, and other functions. Water temperature tests using simulated temperature sensor integrated perception containers in the water temperature, and operational amplifier will be used by very small sensor output voltage analog signal amplification. Using keyboard scan mode on the target temperature (20 ° C to 80 ° C) artificial settings, and digitally dynamic display of real-time water temperature. At the same time through the relay system heater control circuits of the on - and closed to maintain the set temperature is essentially the same purpose. Water temperature control algorithm used today more mature, the use of a wide range of PID algorithm. Through a PID algorithm debugging test as a proportion, integral, differential constant and thus control the heating time ratio, the system reduced regulation time. Temperature control of the static error ≤ 0.4 ℃, calibration temperature ≤ 1 ℃.
Key words:SCM (89S51); automatic control;PID algorithm