【正文】 計(jì)算式間接 ...................................................................................................4 磁敏式間接 ...................................................................................................4 基于 SAW 方式 ............................................................................................5 直接式 ..................................................................................................................53 系統(tǒng)的總體設(shè)計(jì) ....................................................................................7 系統(tǒng)的需求分析 ..................................................................................................7 工作環(huán)境 .......................................................................................................7 技術(shù)分析 .......................................................................................................7 汽車(chē)輪胎爆胎原因分析 ...............................................................................7 系統(tǒng)的總體設(shè)計(jì) ..................................................................................................8 總體設(shè)計(jì) ........................................................................................................8 檢測(cè)模塊設(shè)計(jì) ................................................................................................9 主機(jī)部分設(shè)計(jì) ................................................................................................94 元器件介紹 ..........................................................................................10 VIII 傳感器 ................................................................................................................10 英飛凌的 SP12，SP12T,SP30 ....................................................................10 飛思卡爾的 MPXY8300 系列 ....................................................................11 GE 的 NPX 系列 ..........................................................................................12 三種傳感器比較 ..........................................................................................12 MCU ...................................................................................................................13 RF 射頻收發(fā)芯片 ...............................................................................................13 模塊簡(jiǎn)介： ..................................................................................................13 模塊電氣特性 ..............................................................................................14 模塊引腳說(shuō)明 .............................................................................................14 模塊與單片機(jī)接口電路 .............................................................................15 工作模式控制 .............................................................................................16 數(shù)據(jù)和控制接口 .........................................................................................16 MC33690 ............................................................................................................17 特點(diǎn) ..............................................................................................................17 引腳圖 .........................................................................................................18 供電電源 ............................................................................................................18 天線 ....................................................................................................................18 液晶屏 ................................................................................................................19 結(jié)論 ....................................................................................................................195 系統(tǒng)關(guān)鍵問(wèn)題的解決 ..........................................................................20 功耗問(wèn)題 ............................................................................................................20 輪胎定位問(wèn)題 ....................................................................................................20 NRF24L01 跳頻接收 .........................................................................................216 硬件設(shè)計(jì) ..............................................................................................22 傳感器部分電路設(shè)計(jì) ........................................................................................22 采樣端 RF 發(fā)射部分電路設(shè)計(jì) .........................................................................22 低頻信號(hào)接收電路 ............................................................................................23 IX 顯示電路 ............................................................................................................24 低頻信號(hào)發(fā)射電路 ............................................................................................24 主機(jī)電路 ............................................................................................................257 軟件設(shè)計(jì)及仿真結(jié)果 ..........................................................................26 總體設(shè)計(jì) ............................................................................................................26 運(yùn)行 LCD 顯示子程序 ......................................................................................27 射頻發(fā)射子程序 ................................................................................................28 射頻接收子程序 ................................................................................................29 液晶屏顯示仿真結(jié)果 ........................................................................................30總結(jié) ..........................................................................................................32致謝 ..........................................................................................................33參考文獻(xiàn) ..................................................................................................34附錄 ..........................................................................................................35