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The system is a nucleus model on the main control of single chip computer 78F9234, using DS18B20 temperature sensor to collect temperature data and digital tube monitor to show temperature data, with up-and-down limitation of temperature control key to change temperature rise and drop, heating indicator equipment, overheating protection and buzzer warning function, single-chip microcomputer's burning port and anti-death circuit. The system is convenient to use, cost is comparatively low and control system in software can be further improved to expand its function without adding its hardware cost, which would enhance the cost performance of temperature controllers.

The digital control technique of single chip microcomputer is adopted in the design of DC voltage-stabilized power supply for a multifunctional, digitalized DC voltage-stabilized power supply with higher performance cost ratio. This power source uses the digital adjustment, the output precision is high. It also has short and over-current protection and alarm, which is suitable especially in each kind situation of the high accuracy request. This design intellectualization direct-current power supply uses the self-restraint keyboard entry. The single-chip microcomputer receives voltage value information of keyboard input, and caries on processing.