温度传感器选择(共26页).docx

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1、精选优质文档-倾情为你奉上一、 温度传感器选择由于采用NTC热敏电阻与温度的关系是非线性的，用电桥实现温度升高引起的电阻变化对应于电压变化，因此输出的结果测试精度较低，并且不能达到我们对温度控制的要求。温度传感器AD590是一种电压输入、电流输出型集成温度传感器，测温范围为-55150，精度高，非线性误差仅为0.3，调节系数为1微安每K，输出电流I=（273+T）微安。温度传感器LM1335，V0=10毫伏每摄氏度，具有很高的工作精度与线性工作范围。器件输出电压与温度成线性关系，调节系数为10毫伏每摄氏度，因而优越之处在于无需外部校准微调，可以供14常用室温精度。二、 转换电路将采集到的电信号

2、转换为05V之间，使之可以直接加到ADC0809端口。三、 采样值量化算法：比例系数KT=0.0278V|=27.8MV0摄氏度时，电压为0+55*0.0278=1.529V，每个数字量对应电压值19.53MV,用KS表示得到数字量与温度的关系。KT|KS=1.426数字量每摄氏度0摄氏度对用AD输出量D0=55*1.426=78.4379=B 四、 ADC0809五、基本功能是用三个按键来控制风速、类型以及停止这三个状态的变换。当风速键 按下时实现风速强、中、弱三种状态依次循环切换，并用三个 LED 指示灯来显示；当类型键按下时实现类型正常、睡眠、自然三种状态的依次循环切换，并用三个LED

3、指示灯来显示。 题目中类型键要求自然状态转2 秒，停4 秒；睡眠状态转2 秒，停转6 秒，这个涉及到时间问题， 可以通过硬件或者软件来实现，选择通过软件来实现。控制系统分四个功能模块，主要包含风速设置、类型设置、默认状态显示和退出系统。1、风速设置这个模块中风速的三个状态强、中、弱之间的循环切换是通过将端口A的键值逐次加1(初始值为0, 每按下一次风速键寄存器值加1)，然后对3求余，取其余数分别代表这三个状态来实现的。由于对3求余的余数只有 0、1、2 三个值，分别代表强、中、弱，将其余数保存到寄存器中，根据寄存器中是 0、1、2 来判断强、中、弱风三个状态。 2、类型设置 风的类型有：正常、

4、自然、睡眠三种。 a) 正常 电扇连续运转。 b) 自然 电扇模拟自然风，即转2s，停4s。 c) 睡眠 电扇慢转，产生轻柔的微风，运转 2s，停转6s。 自然状态和睡眠状态时间的控制是通过调用延时子程序来实现的，由于一个机器周期是 10 -6 秒，延时 程序是通过循环来实现的，让指令执行106 次来实现1 秒。不是很精确。MY8255_AEQU0FF00H；8255AMY8255_BEQU0FF01H；8255BMY8255_CEQU0FF02H；8255CMY8255_MODEEQU0FF03H；8255STACK1SEGMENTSTACKDW256DUP(?)STACK1ENDSDATA

5、SEGMENTDATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVDX,MY8255_MODE MOV AL,90H OUT DX,AL MOV DX,MY8255_C MOV AL,00H OUT DX,AL MOV DX,MY8255_B MOV AL,0FFH OUT DX,ALSTART1: MOV DX,MY8255_A /对8255A口进行扫描 IN AL,DX AND AL,B CMP AL,08H /对按键进行判断 JNZ T1 CALL ZIRAN /调用自然模式 T1: MOV DX,MY8255_A IN AL,DX AND

6、AL,B /屏蔽按键 CMP AL,00H JNZ T10 CALL STOP T10: CMP AL,01H JNZ T6 CALL QIANG T6: CMP AL,02H JNZ T8 /AL非02H跳入T8 CALL ZHONG T8: CMP AL,04H JNZ T9 CALL RUO T9: JMP START1 /自然模式 ZIRAN PROC NEAR MOV DX,MY8255_B /对8255B口进行初始化 MOV AL,0F7H OUT DX,AL MOV CX,40 /循环次数进行控制 T: MOV DI,1770H CALL ZHENGZHUAN LOOP T CA

7、LL DL4S RET ENDP/强风模式 QIANG PROC NEAR MOV DX,MY8255_B /对8255B口进行初始化 MOV AL,0FEH OUT DX,AL MOV DI,0A00H MOV DX,MY8255_A /扫描8255A口 IN AL,DX AND AL,B CMP AL,10H /对按键进行判断 JNZ T2 CALL FANZHUAN CMP AL,01H JZ T3 T2: CALL ZHENGZHUAN T3: RET ENDP/中风模式 ZHONG PROC NEAR MOV DX,MY8255_B /对8255B口进行初始化 MOV AL,0FDH

8、 OUT DX,AL MOV DI,1000H MOV DX,MY8255_A /扫描8255A口 IN AL,DX AND AL,B CMP AL,10H /对按键进行判断 JNZ T4 T4: CALL FANZHUAN CMP AL,10H JNZ T5 CALL ZHENGZHUAN T5: RET ENDP /停止模式STOPPROCNEARMOVDX,MY8255_B/对8255B口进行初始MOVAL,0FFHOUTDX,ALMOVDX,MY8255_C/对8255C口进行初始化MOVAL,00HOUTDX,ALCALLDL500ms/调用延时RETENDP/弱风模式RUOPROC

9、NEARMOVDX,MY8255_B/对8255B口进行初始MOVAL,0FBHOUTDX,ALMOVDI,1B00HMOVDX,MY8255_A/扫描8255AINAL,DXANDAL,BCMPAL,10H/对按键进行判断JNZA1CALLFANZHUANA1:CMPAL,10HJNZA2CALLZHENGZHUANA2:RETENDP/反转模式FANZHUANPROCNEARMOVDX,MY8255_A/扫描8255AINAL,DXNOTALMOVDX,MY8255_BOUTDX,ALMOVDX,MY8255_CMOVAL,09H/设置风扇的旋转方式OUTDX,ALCALLDELAYMOV

10、AL,0CHOUTDX,ALCALLDELAYMOVAL,06HOUTDX,ALCALLDELAYMOVAL,03HOUTDX,ALCALLDELAYRETENDP/正转模式ZHENGZHUANPROCNEARPUSHDXMOVDX,MY8255_C/对8255C口进行初始化MOVAL,03HOUTDX,ALCALLDELAYMOVAL,06H/设置风扇的旋转方式OUTDX,ALCALLDELAYMOVAL,0CHOUTDX,ALCALLDELAYMOVAL,09HOUTDX,ALCALLDELAYPOPDXRETENDP/延时程序设置 DELAY PROC NEAR PUSH CX MOV

11、CX,DI DATE: LOOP DATE POP CX RET ENDP DL500ms PROC NEAR PUSH CX MOV CX,60000 DL500ms1: LOOP DL500ms1 POP CX RET DL500ms ENDP DL4S PROC NEAR PUSH CX MOV CX,8 DL4S1: CALL DL500ms LOOP DL4S1 POP CX RET ENDP CODE ENDS END START data segment isend db 0 n0 db 0 n1 db 0 n2 db 0 isright db 1 keykind db 0 ol

12、dkey db 0 kind db 0 isstop db 0 flags db 0 numbers db 3fh,6,5bh,0,0,0,0,0,0,0data endscode segment assume cs:code,ds:datamain:；主程序 cli mov ax,cs mov ds,ax mov kind,0 mov isright,1 mov keykind,0ah mov oldkey,0ah mov kind,0 mov isstop,0 mov flags,0 mov isend,0 mov n0,0 mov n1,0 mov n2,0 call initnumbe

13、rs call init8255 call init8259 call init8253 call modifyint mov dx,212h mov al,0out dx,al call cleardevice call display mov al,0 mov dx,22ah out dx,al mov al,30h out dx,al mov al,7fh stidowhat: push axdowait: mov al,0ffh；单色灯清零 mov dx,211h out dx,al mov dx,210h in al,dx test al,1；判断开关 jz dowait pop a

14、x call readakey cmp keykind,0ah jnz a1 mov kind,2 call gotonext jmp aaa1:；判断风速改变 cmp keykind,0bh jnz a2 mov kind,1 call gotonext jmp aaa2: cmp keykind,0ch jnz a3 mov kind,0 call gotonext jmp aaa3: cmp keykind,0dh jnz a4 push axmov dx,212h mov al,0 out dx,al pop ax mov isstop,0 push ax mov al,oldkey

15、mov keykind,al call reading mov dx,212h mov al,0ffh out dx,al pop ax sti jmp aaa4: cmp keykind,0eh jnz aa not flags push ax mov al,oldkey mov keykind,al pop axaa: jmp dowhatgotonext:；单色灯循环亮灭 mov dx,211h out dx,al cmp flags,0 jnz noror ror al,1noror: cmp al,0feh jnz continue jmp continuecontinue: cmp

16、 kind,2 jnz mm1 call speed2 jmp mm3mm1:；改变风速 cmp kind,1 jnz mm2call speed1 jmp mm3mm2: cmp kind,0 jnz mm3 call speed0mm3: push axmm33: cmp isstop,0 jz mm4 mov dx,211h mov al,0ffh out dx,al mov dx,210h in al,dx test al,1 jnz mm33 mov isstop,0 climm4: pop ax retreadakey:；读取键盘输入 push ax mov al,keykind

17、mov oldkey,al mov dx,22ah in al,dx and al,0fh cmp al,0 jz gotoexit mov al,40h mov dx,22ah out dx,al mov dx,228h in al,dx mov keykind,algotoexit: pop ax retspeed1:；速度设置 push cxmov cx,18000sp1: loop sp1 pop cx retspeed2: push cx mov cx,50000sp2: loop sp2 pop cx retspeed0: push cx mov cx,8000sp0: loop

18、sp0 pop cx retreadisd:key: mov dx,22ah in al,dx and al,0fh cmp al,0 jz key mov al,40h out dx,al mov dx,228h in al,dx cmp al,0dh jnz key retreading:；输入时间 push ax mov n0,0 mov n1,0 mov n2,0 call readanumber mov n0,al call display call readanumber cmp al,0dhjz readexit mov ah,n0 mov n0,al mov n1,ah cal

19、l display call readanumber cmp al,0dh jz readexit mov ah,n0 mov n0,al mov al,n1 mov n1,ah mov n2,al call display call readisdreadexit: pop ax retreadanumber:key2: mov dx,22ah in al,dx and al,0fh cmp al,0 jz key2 mov al,40h out dx,al mov dx,228h in al,dx retinitnumbers: push bx mov bx,offset numbers

20、mov byte ptrbx,3fh mov byte ptrbx+1,6 mov byte ptrbx+2,5bh mov byte ptrbx+3,4fh mov byte ptrbx+4,66h mov byte ptrbx+5,6dh mov byte ptrbx+6,7dh mov byte ptrbx+7,7 mov byte ptrbx+8,7fh mov byte ptrbx+9,6fh pop bx retdisplay:；时间显示 call cleardevice mov bx,offset numbers mov al,80h mov dx,22ah out dx,al

21、mov al,n0 xor ah,ah add bx,ax mov al,bx mov dx,228h out dx,al mov bx,offset numbers mov al,81h mov dx,22ah out dx,al mov dx,228h mov al,n1 xor ah,ah add bx,ax mov al,bx out dx,al mov bx,offset numbers mov al,82h mov dx,22ah out dx,al mov dx,228h mov al,n2 xor ah,ah add bx,ax mov al,bx out dx,al reti

22、ntcount: push ax push bx push dx cmp n0,0 jz next1 dec n0 jmp next4next1: mov n0,9 cmp n1,0 jz next2 dec n1 jmp next4next2: mov n1,9 cmp n2,0 jz next3 dec n2 jmp next4next3: mov n2,9next4: cmp n0,0 jnz next5 cmp n1,0 jnz next5 cmp n2,0 jnz next5 mov isstop,1 mov dx,212h mov al,0 out dx,alnext5: call

23、 display pop dx pop bx pop ax iretinit8255: mov al,90h mov dx,213h out dx,al retinit8259: mov al,13h mov dx,220h out dx,al mov dx,221h mov al,30h out dx,almov al,3 out dx,al mov al,0feh out dx,al retmodifyint: push ds push bx push ax xor ax,ax mov ds,ax mov bx,30h*4 mov ax,offset intcount mov bx,ax

24、mov ax,8100h mov bx+2,ax pop ax pop bx pop ds retinit8253: push ax mov al,35h mov dx,203h out dx,al mov ax,0ffffh mov dx,200h out dx,al mov al,ah out dx,al mov al,75h mov dx,203h out dx,al mov ax,27 mov dx,201h out dx,al mov al,ah out dx,al pop ax retcleardevice: push ax push dxmov al,0c1h mov dx,22ah out dx,alwait1: mov dx,22ah in al,dx test al,80h jnz wait1 pop dx pop ax retcode ends end main专心-专注-专业