This paper uses single-chip microcontroller P89LPC935 of PHILPS as the key part , assisting to spread outer circle electric circuits, such as temperature sensor and PCF8563 clock chip...etc., to design a style multi-function electricity water- heater controller which can heat in the fixed time and display time and temperature in real-time.
This paper introduces firstly the overall composition of the system, and then describes its two parts of hardware and software. The interaction between the whole structure and every module are described in the hardware. For the real-time clock-calendar chip PCF8563, their internal structures and external characteristics are introduced further. The software gives the graph of the procedure flow and adopts module design; several separate sub-modules are divided under the main program module. The digital filter methods are also adopted in order to get rid of the interfere of the random sharp pulses. Then the fundamental algorithm is described. Finally the summary of the system is given.
Keywords：single-chip microcomputer, temperature sensor, multi-function, water heater
