基于单片机.温度和压力智能控制系统设计说明书.doc

word完美格式 精心整理 学习帮手 基于单片机的温度及压力智能控制系统设计 摘 要 本文设计了以AT89C51单片机为核心的温度和压力控制系统的工作原理以及设计方法。温度信号由温度传感器PT100采集，再由变送器将信号变换为0-5V的信号给PCF8591芯片。单片机最后通过IIC总线将模拟量信号读回来或者发送出去。压力信号也是由压力传感器采集回来，再由变送器变换为0-5V的电压信号给PCF8591芯片。PCF8591芯片是支持4路模拟量输入，1路模拟量输出的8位芯片，并且支持IIC总线，最大可以同时接8个同样的芯片。单片机将采集回来的信号经过计算与处理后将温度和压力值显示在LCD1602液晶上，设计中介绍了控制系统的硬件电路，包括：温度、压力检测电路、温度控制电路、压力控制电路、电源电路、报警电路、显示电路、单片机最小系统电路、按键电路和其他一些单片机的接口电路。本设计中还介绍了软件程序编写部分，都采用模块化的结构编程。软件程序部分主要包括：主程序、显示程序、温度和压力采集子程序、按键子程序、控制输出子程序等。 关键词： A/D转换；单片机；温度及压力采集；智能控制 Abstract In this paper, the design of the working principle and designing method of AT89C51 microcontroller as the core to the temperature and pressure control system. Temperature signal from the temperature sensor PT100 acquisition, and then by the transmitter signal into the 0-5V signal to the PCF8591 chip. SCM through IIC bus to analog signals read back or send out. The pressure signal is returned from the pressure sensor, the transmitter is converted to the 0-5V voltage signal to the PCF8591 chip. The PCF8591 chip is supported by 4 analog input, 8 bit chip 1 analog output, and support for IIC bus, the maximum can connect 8 of the same chip. SCM will the collected signals through the calculation and processing after the temperature and pressure values are displayed in the LCD1602 crystal, the design introduces the hardware circuit, control system includes: temperature, pressure detecting circuit, temperature control circuit, pressure control circuit, power supply circuit, alarm circuit, display circuit, MCU minimum system circuit, a key circuit and some other mcu. This design also describes the software programming, the programming modular structure. The software includes: main program, display program, temperature and pressure acquisition subroutine, subroutine keys, control output subroutine. Keywords: A/Dtransformation temperature and pressure acquisition intelligent control; 目 录 1 绪论 1.1研究背景及现状 单片机自从20世纪70年代产生以来，已经广泛地应用在工业自动化控制、自动检测、机电一体化设备、智能仪器仪表、家用