1、基于温度远程控制系统串口通信基于温度远程控制系统之串口通信模块【实验目的】1、 熟悉单片机的基本输入输出应用；2、 掌握Protues模块原理绘图方法；3、 掌握动态数码管显示原理和LCD1602液晶屏的基本显示；4、 掌握DS1302时钟的读取；5、 在数码管上连续显示5秒钟的时间和5秒中的日期；6、 在LCD1602上显示5秒钟的时间和日期，接着显示5秒中的温度。7、 把A机采集的时间、温度数据显示在A机的数码管上，并且发送给B机。8、 如果A机采集的温度超过30度则蜂鸣器工作以示警告。【实验原理】对上个实验电路图进行了如下调整，见图A所示，图中数码管接于P0接口，通过利用AT89C51对
2、P0接口的输出值不同去控制一个数码管显示从0F不同的数值。74LS138三八译码器接于A机的P2.0P2.2接口，利用其去控制选择8个数码管中的哪一个数码管亮，利用人眼的视觉延迟，造成8个数码管一起亮的现象。因为Protues中没有LCD1602但是有LM1602，因为两者功能完全相同，只是LM1602没有背光正负极的引脚，故用其代替。LM1602的双向数据端接于P1接口，RS寄存器、R/W读写信号线、EN使能端分别接于B机的P2.5、P2.6、P2.7。利用AT89C51对P1接口和A机的BP2.5、P2.6、P2.7接口输出不同和时序不同，使其显示规定的字符。时钟芯片DS1302的RST、
3、SCLK、IO接口分别接在A机的P2.3、P2.4、P2.5接口。DS18B20的DQ（IO）接在P3.7接口。通过串口通信实现A机向B机发送数据。利用蜂鸣器的通断来控制其工作。【实验内容】1、 熟悉Protues绘制原理图的基本步骤。2、 学会可执行文件的加载以及程序仿真的方法。3、 验证数码管的动态显示效果。4、 验证DS1302写入和读取效果。5、 验证LCD1302显示效果。6、 验证DS18B20温度读取效果。7、 验证串口通信。8、 验证蜂鸣器。【实验步骤】1、 熟悉动态数码管显示的原理，LCD1602显示的原理。2、 熟悉DS1302芯片的写入和读取。3、 熟悉DS18B20芯片
4、的读取。4、 绘制Protues原理图。5、 在ISIS中加载可执行文件a.hex运行仿真，并调试。【实现效果】实验效果如图A2所示，完成实验目的所要求的内容。【实验小结】通过这次实验是我更加熟悉了数码管的动态显示以及LCD1602的显示和DS1302的写入和读取，以及keil和Protues的应用。【附录】C51源程序A机程序#include#define smg P0sbit DQ=P37;sbit a=P20;sbit b=P21;sbit c=P22;sbit RST=P23;sbit SCLK=P24;sbit IO=P25;sbit fmq=P26;unsigned char se
5、cond,minute,hour,week,day,month,year;unsigned char table=0123456789;unsigned char t1302=0x15,0x10,0x23,0x2C,0x22,0x17,0x00;unsigned char code zf21=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f, 0x77,0x7c,0x39,0x5e,0x79,0x71, 0xC0,0x40,0xff,0x39,0x80; /n,-,+,C .unsigned char zfc=+-0123456789.C;un
6、signed char zfcls9;unsigned char sj8;unsigned char sj18;unsigned char lssj18;unsigned char lssj28;void delay(int i) int j; for(i;i0;i-) for(j=0;j10;j+);void send(unsigned char dat) SBUF=dat; while(TI=0); TI=0;unsigned char read1302(unsigned char add) unsigned char n,dat,dat1; RST = 0; SCLK = 0; RST
7、= 1; for(n=0; n= 1; SCLK = 1; SCLK = 0; for(n=0; n1) | (dat17); SCLK = 1; SCLK = 0; RST = 0; SCLK = 1; IO = 0; IO = 1; return dat; void write1302(unsigned char add,unsigned char dat) unsigned char n; RST = 0; SCLK = 0; RST = 1; for (n=0; n= 1; SCLK = 1; SCLK = 0; for (n=0; n= 1; SCLK = 1; SCLK = 0;
8、RST = 0;void read1302time() second=read1302(0x81); minute=read1302(0x83); hour=read1302(0x85); day=read1302(0x8b); week =read1302(0x87); month=read1302(0x89); year=read1302(0x8d);void init1302() write1302(0x8e,0x00); write1302(0x8c,t13020); write1302(0x88,t13021); write1302(0x8a,t13022); write1302(0
9、x86,t13023); write1302(0x84,t13024); write1302(0x82,t13025); write1302(0x80,t13026); write1302(0x8e,0x80);int init18b20() int i; DQ=0; i=70; while(i-); DQ=1; i=0; while(DQ) i+; if(i50000) return 0; return 1;void write18b20(unsigned char dat) int i,j; for(i=0;i=1; DQ=1;unsigned char read18b20() unsig
10、ned char dat,ls; int i,j; for(i=0;i1)|(ls7); j=4; while(j-); DQ=1; return dat;void changtemp() init18b20(); delay(10); write18b20(0xcc); write18b20(0x44); delay(100);void readtemp() init18b20(); delay(10); write18b20(0xcc); write18b20(0xbe); int temp() unsigned char t1,t2; int temp=0; changtemp(); r
11、eadtemp(); t1=read18b20(); t2=read18b20(); temp=t2; temp0) zfcls0=zfc0; sj0=zf18; sj10=11; te=t; t=te*0.0625*100+0.5; if(t0) zfcls0=zfc1; sj0=zf17; sj10=12; t=t-1; t=t; te=t; t=te*0.0625*100+0.5; sj1=zft/10000; sj11=t/10000; sj2=zft%10000/1000; sj12=t%10000/1000; sj3=zft%1000/100; sj13=t%1000/100; s
12、j4=zf20; sj14=13; sj5=zft%100/10; sj15=t%100/10; sj6=zft%10; sj16=t%10; sj7=zf19; sj17=14; void cktx() SCON=0X50; TMOD=0X20; PCON=0X80; TH1=0XF3; TL1=0XF3; ES=1; EA=1; TR1=1;void smgxs1() int i; for(i=0;i8;i+) switch(i) case(0): lssj1i=hour/16; lssj2i=zflssj1i;break; case(1): lssj1i=hour%16; lssj2i=
13、zflssj1i;break; case(2): lssj1i=10; lssj2i=zf17;break; case(3): lssj1i=minute/16; lssj2i=zflssj1i;break; case(4): lssj1i=minute%16; lssj2i=zflssj1i;break; case(5): lssj1i=10; lssj2i=zf17;break; case(6): lssj1i=second/16; lssj2i=zflssj1i;break; case(7): lssj1i=second%16; lssj2i=zflssj1i;break; send(l
14、ssj1i); for(i=0;i8;i+) switch(i) case(0): c=0;b=0;a=0;break; case(1): c=0;b=0;a=1;break; case(2): c=0;b=1;a=0;break; case(3): c=0;b=1;a=1;break; case(4): c=1;b=0;a=0;break; case(5): c=1;b=0;a=1;break; case(6): c=1;b=1;a=0;break; case(7): c=1;b=1;a=1;break; smg=lssj2i; delay(10); smg=0x00; i=0;void s
15、mgxs2() int i; for(i=0;i8;i+) send(sj1i); switch(i) case(0): c=0;b=0;a=0;break; case(1): c=0;b=0;a=1;break; case(2): c=0;b=1;a=0;break; case(3): c=0;b=1;a=1;break; case(4): c=1;b=0;a=0;break; case(5): c=1;b=0;a=1;break; case(6): c=1;b=1;a=0;break; case(7): c=1;b=1;a=1;break; smg=sji; delay(1); smg=0
16、x00; i=0;void main() unsigned char i; i=0; cktx(); init1302(); smgxs1(); while(1) read1302time(); gettemp(); if(second%16=6) smgxs2(); if(sj122) fmq=fmq; B机#include#define lcd P1#define smg P0#define led P0sbit RS=P25;sbit RW=P26;sbit EN=P27;sbit a=P20;sbit b=P21;sbit c=P22;unsigned char table=01234
17、56789:+-.C;unsigned char code zf21=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f, 0x77,0x7c,0x39,0x5e,0x79,0x71, 0xC0,0x40,0xff,0x39,0x80; unsigned char sj8; unsigned char sj18;unsigned char sj28;void delay(int i) int j; for(i;i0;i-) for(j=0;j10;j+);void writecom(unsigned char com) lcd=com; RS=0
18、; RW=0; EN=1; delay(20); EN=0;void writedat(unsigned char dat) lcd=dat; RS=1; RW=0; EN=1; delay(20); EN=0;void init() writecom(0x01); writecom(0x38); writecom(0x0c); writecom(0x06);void cktx() SCON=0X50; TMOD=0X20; PCON=0X80; TH1=0XF3; TL1=0XF3; ES=1; EA=1; TR1=1;unsigned char receive() unsigned cha
19、r dat; while(RI=0); RI=0; dat=SBUF; return dat;void lcdxs1( ) int i; for(i=0;i8;i+) sji=receive(); /*if(sj7!=14) for(i=0;i8;i+) sj2i=sji; */ writecom(0x80); for(i=0;i8;i+) writedat(tablesji); i=0;/*void lcdxs2( ) int i; for(i=0;i8;i+) sji=receive(); if(sj2!=10) for(i=0;i8;i+) sj1i=sji; writecom(0xc0); for(i=0;i8;i+) writedat(tablesj1i); i=0;*/void main() /unsigned char i=0; init(); cktx(); while(1) lcdxs1(); / lcdxs2();
