液晶显示电冰箱温控器.doc

液晶显示电冰箱温控器 关键词：单片机，温度传感器，LCD Abstract: AT89C52 single chip microcomputer as control core, It is responsible for the whole system operation and control. DS18B20 measuring the temperature of the cold room and transported to the single-chip microcomputer processing, single chip microcomputer control according to the preset temperature, compared to control. Through the triode VT1, relay K1, drive the compressor rev. / stop operation, and ultimately make cold room temperature keep in a more ideal low temperature area, and to realize the low temperature of food refrigerated anti-staling. LCD module synchronous shows a preset temperature value and measured cold room temperature, and single chip microcomputer also produce real time clock for liquid crystal display, liquid crystal display refrigerator temperature controller can be used as a precision of using electronic clock. In addition, AT89C52 single chip microcomputer is also responsible for the keyboard scanning. Keywords: SCM，temperature transmitter，LCD 目 录 1前言 .................................................................. 3 2总体方案设计 .......................................................... 4 2.1方案比较 .......................................................... 4 2.2方案论证 .......................................................... 5 2.3方案选择 .......................................................... 5 3 单元模块设计 .......................................................... 6 3.1各单元模块功能介绍及电路设计 ........................................ 6 3.1.1电源电路 ........................................................ 6 3.1.2时钟电路 ........................................................ 6 3.1.3键盘输入电路 .................................................... 7 3.1.4测温电路 ........................................................ 8 3.1.5继电器控制电路 .................................................. 8 3.1.6液晶显示电路 .................................................... 9 3.2特殊器件介绍 ..