【正文】 rocessor control module for data acquisition and processing. Controller is a single clock / machine cycle MCU is a new generation of highspeed, low power consumption, strong antijamming 8051, its instruction code is fully patible with 8051, but the speed is 812 times faster than the infrared reflectance sensor design of the gun module is selected in this system, ST188 speed detection in the range of 813 mm. Selection of the DS18B20 temperature sensor in the system temperature, the sensor can be realtime display of temperature changes, can show the changes in water temperature of the car action in a timely manner, but the temperature range of the temperature sensor is limited, very limited. To make the system be able to better North PC, remote control, so I designed a switching voltage of the MAX232 chip serial munications interface circuits. Also designed the LED alarm circuit and various auxiliary circuits, the circuit module, signal processing by the microcontroller, the final will display the data needed to LCD12864 display module has to meet the design requirements. Keywords: Automotive instrument Multimedia apparatus 12C5A08AD ST188 sensor DS18B20 temperature sensor LCD12864 MAX232 目錄 第一章 緒論 ................................................................................................................. 1 課題研究的背景和意義 .................................................................................. 1 課題研究的背景 .................................................................................... 1 課題研究的意義 .................................................................................... 2 多媒體汽車儀表本體概述 .............................................................................. 3 課題研究的主要內(nèi)容 ...................................................................................... 3 第二章 系統(tǒng)硬件設(shè)計方案 ......................................................................................... 5 硬件總體設(shè)計思想 ......................................................................................... 5 硬件總體方框圖的設(shè)計 ................................................................................. 5 第三章 系統(tǒng)硬件電路設(shè)計 ......................................................................................... 7 單片機主控模塊 ............................................................................................. 7 單片機的選型 ........................................................................................ 7 單片機的管腳介紹 ................................................................................ 8 STC12 型 單片機的特點介紹 ................................................................ 9 溫度傳感器模塊 ........................................................................................... 10 溫度傳感器的選型 .............................................................................. 10 溫度傳感器的電路設(shè)計 ...................................................................... 11 溫度傳感器的內(nèi)部結(jié)構(gòu) ...................................................................... 12 溫度傳感器的測溫原理 ...................................................................... 12 ST188 紅外反射測速傳感器 ......................................................................... 13 ST188 實物圖管腳介紹及測速的實現(xiàn) ............................................... 13 ST188 特點介紹 ................................................................................... 14 ST188 傳感器的電路原理圖 ............................................................... 14 ST188 的光電特性及參數(shù)確定 ........................................................... 15 液晶顯示模塊 ............................................................................................... 16 液晶顯示器的選型 .............................................................................. 16 液晶顯示器的電路設(shè)計圖 .................................................................. 17 液晶顯示器的管腳和功能 .................................................................. 17 液晶顯示器的使用注意事項 .............................................................. 18 模擬傳感器電路設(shè)計 ................................................................................... 19 串口電路模塊設(shè)計 ....................................................................................... 20 串口通信電路的設(shè)計思想 .................................................................. 20 串口通信功能實現(xiàn)及電路 .................................................................. 20 其他各種輔助電路模塊 ............................................................................... 21 USB 電源供電模塊 .............................................................................. 22 晶振模塊 ............................................................................................. 22 復(fù)位電路模塊 ..................................................................................... 23 按鍵電路模塊 ..................................................................................... 24 LED 報警指示燈模塊 ......................................................................... 25 第四章 系統(tǒng)抗干擾設(shè)計 ........................................................................................... 26 本系統(tǒng)干擾來源和特點 ............................................................................... 26 本系統(tǒng)的抗干擾設(shè)計 ................................................................................... 26 第五章 系統(tǒng)軟件的設(shè)計 ........................................................................................... 27 編程語言 介紹 ............................................................................................... 27 C 語言簡介 ........................................................................................... 27 C 語言與匯編語言混用 ....................................................................... 28 C51 編程中斷處理 ............................................................................... 28 軟件模塊設(shè)計 .....................