【毕业论文】基于单片机的小型自来水控制系统的设计.doc

摘 要 以P89C51单片机为核心控制的水位，实现报警和手动、自动。该系统操作方便、性能良好，比较符合用水系统控制的需要用单片机做水位控制是传感器，将信号传送到单片机，单片机再将信号输出给电机，Abstract P89C51 MCU as the core control reservoir water level, to the alarm and manual,automatic water level display. The system is easy to operate, good performance, more in line with the needs of rural water systems to control the MCU core components of water level control sensor, the signal to the microcontroller.the microcontroller then outputs the signal to the motor by the output signal to control the motor start and stop. The control system of the small water pumping, pumping in the pool water level is below the lower limit, higher than the upper limit of water water shortage stopped pumping, and real-time display of the approximate water level, in order to meet the needs of modern production and life. The main design of a copper component as the water level control sensor，and signal to the microcontroller, and an alarm through the internal procedures, level display. Alarm, the water level is the use of light-emitting diode lighting to determine. System failure or power outage, troubleshooting,or re-calls, set up a power-on reset and reset button. microcontroller back to its original state, so that normal operation. Key Words: Microcontroller； Sensor； Water level control； Alarm. 目 录 1.引 言…………………………………………………………………………………………………… 1 2.总体方案设计………………………………………………………………………………………………2 2.1 设计思想及原理……………………………………………………………………………………… 2 2.2 系统结构图…………………………………………………………………………………………… 2 2.3本章小结…………………………………………………………………………………………………3 3.硬件设计……………………………………………………………………………………………………4 3.1 单片机P89C51的功能及结构………………………………………………………………………… 4 3.2复位及时钟设计 …………………………………………………………………………………………6 3.3水位检测电路 ……………………………………………………………………………………………7 3.4报警、水位显示设计 ……………………………………………………………………………………8 3.5传感器与单片机的接口电路 ……………………………………………………………………………9 3.6电源电路设计…………………………………………………………………………………………… 9 3.7抽水泵控制电路设计……………………………………………………………………………………10 3.8本章小结…………………………………………………………………………………………………11 4.软件设计………………………