基于单片机的温度报警系统proteus仿真

1、#include<reg51.h>#include<intrins.h>#define uchar unsigned char#define uint unsigned int#define delaynop() _nop_();_nop_();_nop_();_nop_();sbit hi_led=p23; /高温，低温白净闪烁 ledsbit lo_led=p26;sbit dq=p33; /ds18b20数据线sbit beep=p37; /报警sbit rs=p20; sbit rw=p21; sbit en=p22; sbit k1=p17; /正常显示温度，

2、越界时报警sbit k2=p14; /显示报警温度sbit k3=p11; /查看 rom codeuchar code romcodestr="- rom code -"uchar romcode8=0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00; /64位rom codeuchar code temp_disp_title ="current temp: "uchar current_temp_display_buffer="tempe: "uchar code temperature_char8=

3、0x0c,0x12,0x12,0x0c,0x00,0x00,0x00,0x00; /温度示字符uchar code alarm_temp="alarm temp hi lo"uchar alarm_hi_lo_str="hi: lo: "uchar temp_data2=0x00,0x00;uchar temp_alarm2=0x00,0x00;uchar display5=0x00,0x00,0x00,0x00,0x00,; /温度值uchar display13=0x00,0x00,0x00; /温度报警值uchar code df_table=0,

4、1,1,2,3,3,4,4,5,6,6,7,8,8,9,9; /温度小数位对照表/./报警温度上下限（取值范围：-128+127）（ds18b20温度范围为：-55+125）/数组中前一位为高温值，后一位为低温值/此处类型注意设为char,否则不能进行有符号数的比较char alarm_temp_hl2=70,-20;/.uchar currentt=0; /当前读取温度整数部分uchar temp_value=0x00,0x00;/从ds18b20读取的温度值uchar display_digit=0,0,0,0;/待显示的各温度数位bit hi_alarm=0,lo_alarm=0; /高

5、低温报警标志bit ds18b20_is_ok=1; /传感器正常标志uint time0_count=0; /定时器延时累加/./延时/.void delayxus(int x) uchar i; while(x-)for(i=0;i<200;i+);/. /忙检测bit lcd_busy_check()bit lcd_status;rs=0;/寄存器选择rw=1;/读状态寄存器en=1;/开始读delayxus(1);lcd_status=(bit)(p0&0x80) ;en=0;return lcd_status;/写lcd指令void write_lcd_command(

6、uchar cmd) while(lcd_busy_check()&0x80)=0x80); /忙等待 rs=0; /写选择命令寄存器 rw=0; /写 en=0; p0=cmd; en=1; delayxus(1); en=0;/向lcd写数据void write_lcd_data(uchar dat) while(lcd_busy_check()&0x80)=0x80); /忙等待 rs=1;rw=0;en=0;p0=dat;en=1; delayxus(1); en=0;/设置液晶显示位置void set_lcd_pos(uchar pos) write_lcd_comm

7、and(pos |0x80);/lcd初始化void lcd_initialise() write_lcd_command(0x38);delayxus(1); write_lcd_command(0x01); /清屏delayxus(1); write_lcd_command(0x06); /字符进入模式：屏幕不动，字符后移delayxus(1); write_lcd_command(0x0c); /显示开，关光标delayxus(1); /././自定义字符写cgram/.void write_new_lcd_char() uchar i; write_lcd_command(0x40);

8、 /写cgram for(i=0;i<8;i+) write_lcd_data(temperature_chari); /写入温度符号/./延时/.void delay(uint num) while(-num);/./初始化ds18b20/.uchar init_ds18b20() uchar status; dq=1;delay(8); dq=0;delay(90); dq=1;delay(8); status=dq; delay(100); dq=1; return status; /初始化成功时返回0/./读一节/.uchar readonebyte() uchar i,dat=

9、0; dq=1;_nop_(); for(i=0;i<8;i+) dq=0;dat>>=1;dq=1;_nop_(); _nop_(); if(dq) dat |=0x80;delay(30);dq=1; return dat;/./写一字节/.void writeonebyte(uchar dat) uchar i; for(i=0;i<8;i+) dq=0;dq=dat&0x01;delay(5);dq=1;dat>>=1; /./读取温度值/.void read_temperature() if(init_ds18b20()=1) /ds18b

10、20故障 ds18b20_is_ok=0; else writeonebyte(0xcc); /跳过序列号 writeonebyte(0x44); /启动温度转换 init_ds18b20(); writeonebyte(0xcc); /跳过序列号 writeonebyte(0xbe); /读取温度寄存器 temp_value0=readonebyte(); /温度低8位 temp_value1=readonebyte(); /温度高8位 alarm_temp_hl0=readonebyte(); /报警温度th alarm_temp_hl1=readonebyte(); /报警温度tl ds

11、18b20_is_ok=1; /./设置ds18b20温度报警值/.void set_alarm_temp_value() init_ds18b20(); writeonebyte(0xcc); /跳过序列号 writeonebyte(0x4e); /将设定的温度报警值写入ds18b20 writeonebyte(alarm_temp_hl0); /写th writeonebyte(alarm_temp_hl1); /写tl writeonebyte(0x7f); /12位精度 init_ds18b20(); writeonebyte(0xcc); /跳过序列号 writeonebyte(0x

12、48); /温度报警值存入ds18b20/./在lcd上显示当前温度/.void display_temperature() uchar i; uchar t=150; /延时值 uchar ng=0; /负数标识 char signed_current_temp;/如果为负数则取反加1，并设置负数标识if(temp_value1&0xf8)=0xf8) temp_value1=temp_value1; temp_value0=temp_value0+1; if(temp_value0=0x00) temp_value1+; ng=1; /设负数标识/查表得到温度小数部分display

13、_digit0=df_tabletemp_value0&0x0f;/获取温度整数部分（无符号）currentt=(temp_value0&0xf0)>>4)|(temp_value1&0x07)<<4);/有符号的当前温度值，注意此处定义为char, 其值可为-128+127signed_current_temp=ng?-currentt:currentt;/高低温报警标志设置（与定义为char类型的alarm_temp_hl比较，这样可区分正负比较）hi_alarm=signed_current_temp>=alarm_temp_hl0?

14、1:0;lo_alarm=signed_current_temp<=alarm_temp_hl1?1:0;/将整数部分分解为三位待显示数字display_digit3=currentt/100;display_digit2=currentt%100/10;display_digit1=currentt%10;/刷新lcd显示缓冲current_temp_display_buffer11=display_digit0+'0'current_temp_display_buffer10='.'current_temp_display_buffer9=displa

15、y_digit1+'0'current_temp_display_buffer8=display_digit2+'0'current_temp_display_buffer7=display_digit3+'0'/高位为0时不显示if(display_digit3=0) current_temp_display_buffer7=' '/高位为0且次高位为0时，次高位不显示if(display_digit2=0&&display_digit3=0)current_temp_display_buffer8='

16、'/负数符号显示恰当位置if (ng) if(current_temp_display_buffer8=' ') current_temp_display_buffer8='_' else if(current_temp_display_buffer7=' ') current_temp_display_buffer7='_' else current_temp_display_buffer6='_'/在第一行显示标题set_lcd_pos(0x00);for(i=0;i<16;i+) write_l

17、cd_data( temp_disp_titlei);/在第二行显示当前温度set_lcd_pos(0x40);for(i=0;i<16;i+) write_lcd_data(current_temp_display_bufferi);/显示温度符号set_lcd_pos(0x4d);write_lcd_data(0x00);set_lcd_pos(0x4e);write_lcd_data('c');/./定时器中断，控制报警声音/.void t0_int() interrupt 1 th0=-1000/256; tl0=-1000%256; beep=!beep; if

18、(+time0_count=400) time0_count=0; if(hi_alarm) hi_led=hi_led; else hi_led=0; if(lo_alarm) lo_led=lo_led; else lo_led=0; tr0=0;/./rom code转换与显示/.void display_rom_code() uchar i,t; set_lcd_pos(0x40); for(i=0;i<8;i+) t=(romcodei&0xf0)>>4); if(t>9) t+=0x37;else t+='0' write_lcd_d

19、ata(t); /高位数显示 t=romcodei&0x0f; if(t>9) t+=0x37;else t+='0' write_lcd_data(t); /低位数显示 /./读64位序列码/.void read_rom_code() uchar i; init_ds18b20(); writeonebyte(0x33); /读序列码 for (i=0;i<8;i+) romcodei=readonebyte();/./显示rom code/.void display_romcode() uchar i; set_lcd_pos(0x00); for(i=

20、0;i<16;i+) /显示标题 write_lcd_data(romcodestri); read_rom_code(); /读64位序列码 display_rom_code(); /显示64位rom code/./显示报警温度/.void disp_alarm_temperature() uchar i,ng;/显示alarm_temp_hl数组中的报警温度值/由于alarm_temp_hl类型为char，故可以直接进行正负比较/高温报警值. ng=0; if(alarm_temp_hl0<0) /如果为负数则取反加1 alarm_temp_hl0=alarm_temp_hl0

21、+1; ng=1;/分解高温各数位到待显示串中alarm_hi_lo_str4=alarm_temp_hl0/100+'0'alarm_hi_lo_str5=alarm_temp_hl0/10%10+'0'alarm_hi_lo_str6=alarm_temp_hl0%10+'0'/屏蔽高位不显示的0if(alarm_hi_lo_str4='0') alarm_hi_lo_str4=' 'if(alarm_hi_lo_str4=' '&& alarm_hi_lo_str5='

22、0') alarm_hi_lo_str5=' '/"-"符号显示if (ng) if (alarm_hi_lo_str5=' ') alarm_hi_lo_str5='-' else if(alarm_hi_lo_str4=' ') alarm_hi_lo_str4='-' else alarm_hi_lo_str3='-'/低温报警值ng=0;if(alarm_temp_hl1<0) /如果为负数则取反加1 alarm_temp_hl1=alarm_temp_hl

23、1+1; ng=1;/分解低温各数位到待显示串中alarm_hi_lo_str12=alarm_temp_hl1/100+'0'alarm_hi_lo_str13=alarm_temp_hl0/10%10+'0'alarm_hi_lo_str14=alarm_temp_hl0%10+'0'/屏蔽高位不显示的0if(alarm_hi_lo_str12='0') alarm_hi_lo_str12=' 'if(alarm_hi_lo_str12=' '&& alarm_hi_lo_str13='0') alarm_hi_lo_str13=' '/"-"符号显示if (ng) if (alarm_hi_lo_str13=' ') alarm_hi_lo_str13='-' else if(alarm_hi_lo_str12=' ') alarm_hi_lo_str12='-' else alarm_hi_lo_str11='-'/显示高低温报警温度值set_lcd_pos(0x00); /显示