温度传感器实训报告.doc

温度传感器实训报告实训报告课 程：信号检测与技术专 业：应用电子技术班 级：应电1131班小组成员：欧阳主、王雅志、朱知荣、周玙旋、周合昱指导老师：宋晓虹老师 2013年 4 月 23 日一、实训目的 了解18b20温度传感器的基本原理与应用2、 实训过程1、电路实现功能：由电脑USB接口供电，也可外接6V16V的直流电源。通过温度传感器18B20作为温度传感器件，测出改实际温度，再由芯片为封装AT89C2051 单片机进行数据处理，通过数码管显示温度值。温度显示（和控制）的范围为：-55C到125C之间，精度为1C，也就是显示整数。如果你设定报警的温度为20C，则当环境温度达到21C时，报警发光二极管发光，同时继电器动作。如果你不需要对温度控制（报警），可以将报警温度值设置高些。如果控制的是某局部的温度，可将18B20用引线引出，但距离不宜过大，注意其引脚绝缘。. 电路的构成该电路有电源、按键控制模块、信号处理、驱动模块、显示模块、检测。.电路原理图.电路仿真图五、元件清单及功能介绍名称规格编号主要功能或作用按钮6X6X5AN1、AN2、AN3调节报警温度的值电容30PC1、C2单片机时钟振荡电容10UFC3单片机复位电容470UFC4电源滤波电容104C5电源滤波单片机（20P座）AT89C2051IC1CPU温度传感器DS18B20IC2温度传感器稳压块L7805IC3电路工作于+5V接线座3P5.0J1外电路控制接线座接线座2P5.0J2外接电源接线USB电源插座USBJ3电脑供电插座晶体12MJZ单片机时钟振荡一位共阳数码管0.56LED1摄氏温度符号显示三位共阳数码管0.56LED2温度值显示发光二极管3MMLED3报警发光指示兼Q1偏置三极管8550Q1、Q2、Q3、Q4Q1：报警时驱动继电器；Q2Q3Q4：数码管驱动电阻10KR1单片机复位电阻220和470R7R13和R14数码管限流，其中R14=470电阻4.7KR2、R3、R4、R6三极管基极和温度传感器偏置电阻2KR5三极管Q1基极偏置二极管1N4148V1续流，保护Q1跳线X1、X2用元件引脚连继电器5V2AJDQ温度达到报警值时触点动作PCB板73MMX85MMUSB电源线连接电脑USB口6、程序：/*-温度控制器V1.5显示为三个共阳极LED温度传感器用单总线DS18B20CPU为2051，四个按键，分别为UP，DOWN，SET温度调节上限为125度，下限为-55度只能用于单只18B20-*/#include #include #define Key_UP P3_0 /上调温度#define Key_DOWN P3_1 /下调温度#define Key_SET P1_7 /设定键（温度设定，长按开电源）#define RelayOutPort P3_5 /继电器输出#define LEDPort P1 /LED控制口#define LEDOneC P3_2 /LED DS1控制（百位）#define LEDTwoC P3_3 /LED DS2控制（十位）#define LEDThreeC P3_4 /LED DS3控制（个位）#define TMPortP3_7/DS1820 DataPortunsigned char code LEDDis=0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xFF,0xBF; /0-9的LED笔划,0xFF为空,0xF7为负号static unsigned char bdata StateREG;/可位寻址的状态寄存器sbit DS1820ON = StateREG0; /DS1820是否存在sbit SetTF = StateREG1; /是否是在温度设置状态sbit KeySETDown = StateREG2; /是否已按过SET键标识sbit PowTF = StateREG3; /电源电源标识sbit KeyTF = StateREG4;/键盘是否允许/sbit KeySETDowning = StateREG5;/SET是否正在按下static unsigned char bdata TLV _at_ 0x0029; /温度变量高低位static unsigned char bdata THV _at_ 0x0028;static signed char TMV; /转换后的温度值static unsigned char KeyV,TempKeyV; /键值static signed char TMRomV _at_ 0x0027; /高温限制static signed char TMSetV _at_ 0x0026; /温度设定值static unsigned char KSDNum; /SET键连按时的采集次数static unsigned char IntNum,IntNum2,IntNum3; /中断发生次数，IntNum用于SET长按检测，IntNum2用于设定状态时LED闪烁static signed char LED_One,LED_Two,LED_Three; /LED的显示位 LED_One为十位，LED_Two为个位static unsigned char Sign; /负号标识void main(void)void InitDS1820(void); /定义函数void ROMDS1820(void);void TMVDS1820(void);void TMRDS1820(void);void TMWDS1820(void);void TMREDS1820(void);void TMERDS1820(void);void ReadDS1820(void);void WriteDS1820(void);void Delay_510(void);void Delay_110(void);void Delay_10ms(void);void Delay_4s(void);void V2ToV(void);StateREG = 0; /初始化变量SetTF = 1;PowTF = 1;/关电源THV = 0;TLV = 0;TMV = 0;KeyV = 0;TempKeyV = 0;KSDNum = 0;IntNum = 0;IntNum2 = 0;IntNum3 = 0;LED_One = 0;LED_Two= 0;InitDS1820(); /初始化ROMDS1820(); /跳过ROMTMERDS1820(); /E2PRAM中温度上限值调入RAMInitDS1820(); /初始化ROMDS1820(); /跳过ROMTMRDS1820(); /读出温度指令ReadDS1820(); /读出温度值和上限值TMSetV = TMRomV; /拷贝保存在DS18B20ROM里的上限值到TMSetVEA = 1;/允许CPU中断ET0 = 1; /定时器0中断打开TMOD = 0x1;/设定时器0为模式1，16位模式TH0=0xB1;TL0=0xDF;/设定时值为20000us（20ms）TR0 = 1;/开始定时while(1);/定时器0中断外理中键扫描和显示void KeyAndDis_Time0(void) interrupt 1 using 2 TH0=0xB1;TL0=0xDF;/设定时值为20000us（20ms)LEDPort = 0xFF; if (!Key_UP) KeyV = 1; if (!Key_DOWN) KeyV = 2; if (!Key_SET) KeyV = 3;/KeySETDowning = 0; /清除 if (KeyV != 0) /有键按下 Delay_10ms(); /延时防抖 按下10ms再测 if (!Key_UP) TempKeyV = 1; if (!Key_DOWN) TempKeyV = 2; if (!Key_SET) TempKeyV = 3; if (KeyV = TempKeyV) /两次值相等为确定接下了键 if (KeyV = 3) /按下SET键，如在SET状态就退出，否则进入 /KeySETDowning = 1; /表明SET正在按下 PowTF = 0; /电源标识开if (!KeyTF) if (SetTF) SetTF = 0; /标识位标识退出设定InitDS1820(); /初始化 ROMDS1820(); /跳过ROM TMWDS1820(); /写温度上限指令WriteDS1820(); /写温度上限到DS18B20ROMWriteDS1820(); /写温度上限到DS18B20ROMWriteDS1820(); /写温度上限到DS18B20ROMInitDS1820(); /初始化 ROMDS1820(); /跳过ROM TMREDS1820(); /温度上限值COPY回E2PRAM else SetTF = 1; if (!KeySETDown) /没有第一次按下SET时，KeySETDown标识置1 KeySETDown = 1; else KSDNum = KSDNum + 1; /前一秒内有按过SET则开始计数 if (SetTF) /在SET状态下 if (KeyV = 1) & (!KeyTF) TMSetV = TMSetV + 1; /上调温度 if (KeyV = 2) & (!KeyTF) TMSetV = TMSetV - 1; /下调温度 if (TMSetV = 125) TMSetV = 125; if (!KeyTF) & (IntNum3 = 0) KeyTF = 1; /当键盘处于可用时，锁定 if (KeySETDown) /在2秒内按下了SET则计中断发生次数用于长按SET时计时用 IntNum = IntNum + 1; if (IntNum 55) /中断发生了55次时（大约1.2秒）75为1.5秒左右 IntNum = 0;KeySETDown = 0; if (KSDNum = 55) /如一直长按了SET1.2秒左右 RelayOutPort = 1; /关闭继电器输出 PowTF = 1; /电源标识关 LEDOneC = 0; LEDTwoC = 0; LEDThreeC = 0; LEDPort = 0xBF; /显示- Delay_4s(); /延时 LEDOneC = 1; LEDTwoC = 1; /关显示 LEDThreeC = 1; Delay_4s(); IntNum = 0; IntNum2 = 0; IntNum3 = 0; KSDNum = 0; KeyV = 0; TempKeyV = 0; /清空变量准备下次键扫描 if (!PowTF) InitDS1820();/初始化 ROMDS1820(); /跳过ROM TMVDS1820(); /温度转换指令 Delay_510(); Delay_510(); /延时等待转换完成 InitDS1820(); /初始化 ROMDS1820(); /跳过ROM TMRDS1820(); /读出温度指令 ReadDS1820(); /读出温度值 V2ToV(); /转换显示值 if (TMV TMSetV) /根据采集到的温度值控制继电器 RelayOutPort = 0; else RelayOutPort = 1; if (SetTF) IntNum2 = IntNum2 + 1; /用于闪烁计数 if (IntNum2 50 ) IntNum2 = 0;if (KeyTF) IntNum3 = IntNum3 + 1; /用于防止按键连按if (IntNum3 25) IntNum3 = 0;KeyTF = 0; if (SetTF) & (IntNum2 4; THV = THV 7; /取符号 else Sign = TMV 7;if (Sign) if (SetTF | !Key_SET) LED_One = (TMSetV-1) / 100; /SET状态下显示设定值 LED_Two = (TMSetV-1) - LED_One * 100)/10; LED_Three = (TMSetV-1) - LED_One * 100 - LED_Two * 10; else LED_One = (TMV) / 100;/转换百位值 LED_Two = (TMV) - LED_One * 100)/10; LED_Three = (TMV) - LED_One * 100 - LED_Two * 10;else if (SetTF | !Key_SET) LED_One = (TMSetV) / 100; /SET状态下显示设定值 LED_Two = (TMSetV - LED_One * 100)/10; LED_Three = TMSetV - LED_One * 100 - LED_Two * 10; else LED_One = (TMV) / 100;/转换百位值 LED_Two = (TMV - LED_One * 100)/10; LED_Three = TMV - LED_One * 100 - LED_Two * 10; /转LED字段if (LED_One) /超过百时十位的处理LED_Two = LEDDisLED_Two;elseif (LED_Two = 0)LED_Two = LEDDis10;elseLED_Two = LEDDisLED_Two;if (Sign)LED_One = LEDDis11;elseif (LED_One = 0)LED_One = LEDDis10;elseLED_One = LEDDisLED_One;LED_Three = LEDDisLED_Three;void InitDS1820(void)/初始化DS1820TMPort = 1;/拉高TMPort_nop_(); /保持一个周期TMPort = 0;/拉低TMPort Delay_510(); /延时 DS1820复位时间要500us的低电平 TMPort = 1; /拉高TMPort_nop_(); /保持 _nop_();_nop_(); Delay_110(); /延时110us 等待DS1820回应 if (!TMPort) /回应信号为低电平 DS1820ON = 1; else DS1820ON = 0; Delay_110(); /延时 Delay_110(); TMPort = 1; /拉高TMPortvoid ROMDS1820(void) /跳过ROM匹配#pragma asm MOV A,#0CCH MOV R2,#8 CLR C WR1: CLR P3_7 MOV R3,#6 DJNZ R3,$ RRC A MOV P3_7,C MOV R3,#23 DJNZ R3,$ SETB P3_7 NOP DJNZ R2,WR1 SETB P3_7#pragma endasmvoid TMVDS1820(void) /温度转换指令#pragma asm MOV A,#44H MOV R2,#8 CLR C WR2: CLR P3_7 MOV R3,#6 DJNZ R3,$ RRC A MOV P3_7,C MOV R3,#23 DJNZ R3,$ SETB P3_7 NOP DJNZ R2,WR2 SETB P3_7#pragma endasmvoid TMRDS1820(void) /读出温度指令#pragma asm MOV A,#0BEH MOV R2,#8 CLR C WR3: CLR P3_7 MOV R3,#6 DJNZ R3,$ RRC A MOV P3_7,C MOV R3,#23 DJNZ R3,$ SETB P3_7 NOP DJNZ R2,WR3 SETB P3_7#pragma endasmvoid TMWDS1820(void) /写入温度限制指令#pragma asm MOV A,#04EH MOV R2,#8 CLR C WR13: CLR P3_7 MOV R3,#6 DJNZ R3,$ RRC A MOV P3_7,C MOV R3,#23 DJNZ R3,$ SETB P3_7 NOP DJNZ R2,WR13 SETB P3_7#pragma endasmvoid TMREDS1820(void)/COPY RAM to E2PRAM#pragma asm MOV A,#48H MOV R2,#8 CLR C WR33: CLR P3_7 MOV R3,#6 DJNZ R3,$ RRC A MOV P3_7,C MOV R3,#23 DJNZ R3,$ SETB P3_7 NOP DJNZ R2,WR33 SETB P3_7#pragma endasmvoid TMERDS1820(void)/COPY E2PRAM to RAM#pragma asm MOV A,#0B8H MOV R2,#8 CLR C WR43: CLR P3_7 MOV R3,#6 DJNZ R3,$ RRC A MOV P3_7,C MOV R3,#23 DJNZ R3,$ SETB P3_7 NOP DJNZ R2,WR43 SETB P3_7#pragma endasmvoid WriteDS1820(void)/写入温度限制值#pragma asmMOV A,26H/发出4EH写ROM指令后连发两个字节分别为上下限 MOV R2,#8 CLR C WR23: CLR P3_7 MOV R3,#6 DJNZ R3,$ RRC A MOV P3_7,C MOV R3,#23 DJNZ R3,$ SETB P3_7 NOP DJNZ R2,WR23 SETB P3_7 #pragma endasmvoid ReadDS1820(void) /读出温度值#pragma asm MOV R4,#3 ; 将温度高位和低位，高温限制位从DS18B20中读出 MOV R1,#29H ; 低位存入29H(TEMPER_L),高位存入28H(TEMPER_H)，高温限制位存入27H(TMRomV) R