【導讀】宋體，小四號字，行間距倍。至通信、生物工程、醫(yī)療、家用電器等各方面，幾乎都借助于數(shù)字計算機來完成。數(shù)字量也必須再還原成相應的模擬量，才能實現(xiàn)對模擬系統(tǒng)的控制。果不還原成模擬音像信號就不能被人們的視覺和聽覺系統(tǒng)接受。因此，數(shù)模轉(zhuǎn)換器和。模數(shù)轉(zhuǎn)換器是數(shù)字電子技術(shù)中的重要組成部分。A/D轉(zhuǎn)換器在進行轉(zhuǎn)換期間，要求輸入的模擬電壓保持不變，因此在對連續(xù)。乎無處不在，融入在我們的生活中，雖然原理很簡單，但是，轉(zhuǎn)換后的精度很難把握，2020年2月完成題目選擇，論文的基本提綱。2020年3月可行性進行分析，原理圖繪制，Protues仿真。2020年4月完成板圖繪制，電路板焊接，程序調(diào)試完成。2020年5月準備并完成論文提交。用采樣的電壓值計算出被測電阻的阻值。每升高1℃時電阻值發(fā)生變化的百分數(shù)。電阻測量可分為伏安表法、三表法、歐姆表法和電橋法。及多用表主要用于測量中值電阻,準確度一般較低。隨著科技的發(fā)展，現(xiàn)在普遍使用數(shù)字式萬用表測量電阻值。

　　

【正文】 z41[32]={ 0x0,0x18,0x4,0x4,0x4,0x4,0x84,0x78,0x0,0xf0,0x8,0x4,0x4,0x8,0xf0,0x0, 0x0,0x30,0x40,0x40,0x41,0x41,0x42,0x3c,0x0,0x1f,0x20,0x40,0x40,0x20,0x1f,0x0, }。 //30 unsigned char code hz42[32]={ 0x0,0x0,0xf0,0x8,0x4,0x4,0x8,0xf0,0x0,0xfc,0x84,0x84,0x84,0x84,0x4,0x0, 0x0,0x0,0xf,0x10,0x20,0x20,0x10,0xf,0x0,0x19,0x20,0x20,0x20,0x20,0x1f,0x0, }。 //05 unsigned char code hz43[32]={ 0x24,0x24,0xA4,0xFE,0xA3,0x22,0x20,0x7E,0x42,0x42,0x42,0x42,0x42,0x7F,0x02,0x00, 0x08,0x06,0x01,0xFF,0x00,0x43,0x41,0x49,0x49,0x49,0x7F,0x49,0x4D,0x69,0x41,0x00 }。 //程 unsigned char code hz44[32]={ 0x00,0xFE,0x12,0x62,0x82,0x63,0x1A,0x20,0x10,0x0F,0xE8,0x08,0x08,0x28,0x18,0x00, 0x00,0x3F,0x24,0x23,0x20,0x31,0xA6,0x40,0x30,0x0C,0x03,0x0C,0x30,0x60,0x20,0x00 }。 //歐 unsigned char code hz45[32]={ 0x10,0x10,0xF0,0x1F,0x10,0xF0,0x80,0x80,0xFE,0x82,0x8A,0x92,0x82,0xFF,0x82,0x00, 0x40,0x22,0x15,0x08,0x14,0x63,0x00,0x1F,0x10,0x10,0x52,0x94,0x50,0x3F,0x10,0x00 }。 //姆 unsigned char code hz46[32]={ 0x40,0x20,0x10,0x8C,0x63,0x80,0xBE,0xAA,0xAA,0xAA,0xAA,0xAA,0xBF,0x82,0x00,0x00, 22 0x04,0x02,0x01,0xFF,0x04,0x04,0x0C,0x34,0x04,0x44,0x84,0x7F,0x04,0x06,0x04,0x00 }。 //得 unsigned char code hz47[32]={ 0x80,0x40,0x20,0xF8,0x07,0x04,0xE4,0xA4,0xA4,0xBF,0xA4,0xA4,0xF6,0x24,0x00,0x00, 0x00,0x00,0x00,0xFF,0x40,0x40,0x7F,0x4A,0x4A,0x4A,0x4A,0x4A,0x7F,0x40,0x40,0x00 }。 //值 unsigned char code zero[32]={ 0x0,0x0,0x0,0x0,0x0,0xf0,0x8,0x4,0x4,0x8,0xf0,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0xf,0x10,0x20,0x20,0x10,0xf,0x0,0x0,0x0,0x0,0x0, }。 //0 unsigned char code one[32]={ 0x0,0x0,0x0,0x0,0x0,0x0,0x8,0x8,0xfc,0x0,0x0,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0x0,0x20,0x20,0x3f,0x20,0x20,0x0,0x0,0x0,0x0,0x0, }。 //1 unsigned char code two[32]={ 0x0,0x0,0x0,0x0,0x0,0x30,0x8,0x8,0x8,0x8,0xf0,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0x30,0x28,0x24,0x22,0x21,0x30,0x0,0x0,0x0,0x0,0x0, }。 //2 unsigned char code three[32]={ 0x0,0x0,0x0,0x0,0x0,0x18,0x4,0x84,0x84,0x84,0x78,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0x1c,0x20,0x20,0x20,0x20,0x1f,0x0,0x0,0x0,0x0,0x0, }。 //3 unsigned char code four[32]={ 0x0,0x0,0x0,0x0,0x0,0x0,0xc0,0x20,0x10,0xfc,0x0,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0x2,0x5,0x4,0x24,0x3f,0x24,0x0,0x0,0x0,0x0,0x0, }。 //4 unsigned char code five[32]={ 0x0,0x0,0x0,0x0,0x0,0xfc,0x44,0x44,0x44,0x44,0x84,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0x1c,0x20,0x20,0x20,0x20,0x1f,0x0,0x0,0x0,0x0,0x0, }。 //5 unsigned char code six[32]={ 0x0,0x0,0x0,0x0,0x0,0xe0,0x10,0x88,0x88,0x88,0x18,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0x1f,0x21,0x20,0x20,0x20,0x1f,0x0,0x0,0x0,0x0,0x0, }。 //6 unsigned char code seven[32]={ 0x0,0x0,0x0,0x0,0x0,0x18,0x8,0x8,0x88,0x68,0x18,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3f,0x0,0x0,0x0,0x0,0x0,0x0,0x0, }。 //7 unsigned char code eight[32]={ 0x0,0x0,0x0,0x0,0x0,0x38,0xc4,0x84,0x84,0x84,0xc4,0x38,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x0,0x1f,0x20,0x20,0x20,0x20,0x20,0x1f,0x0,0x0,0x0,0x0, }。 //8 unsigned char code nine[32]={ 0x0,0x0,0x0,0x0,0x0,0xf0,0x8,0x8,0x8,0x8,0x8,0xf0,0x0,0x0,0x0,0x0, 23 0x0,0x0,0x0,0x0,0x0,0x31,0x22,0x22,0x22,0x22,0x11,0xf,0x0,0x0,0x0,0x0, }。 //9 unsigned char code pane[32]={ 0x0,0x0,0x0,0x0,0xe0,0xe0,0xe0,0xe0,0xe0,0xe0,0xe0,0xe0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0x0,0x0,0x0,0x0, }。 //pane unsigned char code line[16]={ //0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0, 0x0,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x0, }。 //_ unsigned char code arrow[32]={ 0x0,0x0,0x0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc4,0xc8,0xd0,0xe0,0xc0,0x80,0x0, 0x0,0x0,0x0,0x1,0x1,0x1,0x1,0x1,0x1,0x11,0x9,0x5,0x3,0x1,0x0,0x0, }。 // unsigned char code minus[32]={ 0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x0,0x0,0x0, }。 //負號 unsigned char code res2[32]={ 0x0,0x0,0x0,0x0,0xe0,0x10,0x8,0x8,0x8,0x8,0x10,0xe0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x19,0x12,0x1c,0x0,0x0,0x1c,0x12,0x19,0x0,0x0,0x0,0x0, }。 //歐姆 unsigned char code k[32]={ 0x0,0x0,0x0,0x0,0x4,0xfc,0x0,0x0,0x80,0x80,0x80,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x20,0x3f,0x24,0x2,0x2d,0x30,0x20,0x0,0x0,0x0,0x0,0x0, }。 //K unsigned char code m[32]={ 0x0,0x0,0x0,0x0,0x4,0xfc,0xfc,0x0,0xfc,0xfc,0x4,0x0,0x0,0x0,0x0,0x0, 0x0,0x0,0x0,0x0,0x10,0x1f,0x0,0x1f,0x0,0x1f,0x10,0x0,0x0,0x0,0x0,0x0, }。 //M /******************************************************************** 液晶顯示 ********************************************************************/ sbit RS = P3^1。 sbit E = P3^2。 sbit RW = P3^3。 sbit CS1 = P3^4。 //換位了 cs1 和 cs2 sbit CS2 = P3^5。 define lcd P2 void lcd_init(void)。 void disp1(unsigned char code *hz)。 24 void disp2(unsigned char code *hz)。 void lcd_mwcode(unsigned char i) //寫入命令 { RS=0。RW=0。E=0。 lcd=i。 E=1。E=0。 } void lcd_mwdata(unsigned char i) //寫入數(shù)據(jù) ， { RW=0。RS=1。E=0。 lcd=i。 E=1。E=0。 } void setpos(unsigned char row , unsigned char col) { lcd_mwcode(0xb8+row)。 //選擇行，列， lcd_mwcode(0x40+col)。 } void lcd_init(void) //初始化 { lcd_mwcode(0xc0)。 lcd_mwcode(0x3f)。 } void disp1(unsigned char code *hz) //顯示漢字上半?yún)^(qū)， { unsigned char i。 for(i=0。i16。i++) lcd_mwdata(*(hz+i))。 } void disp2(unsigned char code *hz) //顯示漢字下半?yún)^(qū) ， { unsigned char i。 for(i=16。i32。i++) lcd_mwdata(*(hz+i))。 } void select(unsigned char x) { 25 switch(x) { case 1:CS1=0。CS2=1。break。 //左屏， case 2:CS1=1。CS2=0。break。 //右屏， default :CS2=0。CS2=0。 } } /********************************************************************