基于DS18B20温度计 AT24C02存储温度上下限值 LCD显示

1、该程序实现DS18B20 温度计在LCD上显示并通过按键设定温度上下限值 AT24C02存储设定值本例程还可实现直流电机的调速 驱动风扇根据温度实现不用的转速程序已通过验证，可完全复制使用。例程中E2PROM DS18B20 LCD的接口定义需要根据各位的硬件自己定义。 实物图片/ 主函数 /#include<reg52.h>#include"lcd.h"#include"18b20.h"#include"at24c02.h"sbit key_ok = P10;sbit key_up = P11;sbit key_do =

2、 P12;sbit speak = P13;sbit mot = P14;uint temp_value;uchar key_num,up_num,do_num;uchar mot_sel;/uchar flag;uchar rate;uchar rate_value;/void sys_init(void);void key_scan(void);void delays(uchar z);void compare(uint temp_com);void mot_pwm(uchar rate_value);void delays(uchar z)uchar x,y;for(x=0;x<z

3、;x+) for(y=0;y<50;y+);void main()LCD_init();I2c_init();key_num=0;/up_num=30;do_num=24;up_num = read_add_24c02(0);delays(50);do_num = read_add_24c02(1);delays(50);LCD_add(4); /初始化温度上限值LCD_dat(up_num/10+0x30);LCD_dat(up_num%10+0x30);delays(100);LCD_add(16); /初始化温度下限值LCD_dat(do_num/10+0x30);LCD_dat(

4、do_num%10+0x30);while(1)temp_value = readtemperature();display(temp_value);key_scan();compare(temp_value);mot_pwm(mot_sel);void key_scan(void)if(!key_ok)delays(10);if(!key_ok)key_num+;while(!key_ok);if(key_num=1)if(!key_up)delays(10);if(!key_up)up_num+;if(up_num>=99) up_num = 0;LCD_add(4);/LCD_co

5、m(0x0f);LCD_dat(up_num/10+0x30);LCD_dat(up_num%10+0x30);while(!key_up);if(!key_do)delays(10);if(!key_do)up_num-;if(do_num=0) up_num = 99;LCD_add(4);LCD_dat(up_num/10+0x30);LCD_dat(up_num%10+0x30);while(!key_do);if(key_num=2)if(!key_up)delays(10);if(!key_up)do_num+;if(do_num>=99) up_num = 0;LCD_ad

6、d(16);/LCD_com(0x0f);LCD_dat(do_num/10+0x30);LCD_dat(do_num%10+0x30);while(!key_up);if(!key_do)delays(10);if(!key_do)do_num-;if(do_num=0) do_num = 99;LCD_add(16);/LCD_com(0x0f);LCD_dat(do_num/10+0x30);LCD_dat(do_num%10+0x30);while(!key_do);if(key_num=3)LCD_com(0x0c);key_num = 0;write_add_24c02(0,up_

7、num);delays(50);write_add_24c02(1,do_num);delays(50);void compare(uint temp_com)uchar temp_z;/temp_x;uchar temp_h,temp_l; /*温度转换*/temp_h = (uchar)(temp_com>>8)&0x00ff);temp_l = (uchar)(temp_com&0x00f0);temp_z = (temp_h<<4)|(temp_l>>4);/temp_x = (uchar)(temp&0x0000f)*0.6

8、25*10; /-/if(temp_z<do_num)|(temp_z>up_num)speak = 0;else speak = 1;if(temp_z<=27) mot_sel = 180;else if(28>=temp_z>27) mot_sel = 170;else if(29>=temp_z>28) mot_sel = 160;else mot_sel = 0;void mot_pwm(uchar rate_value)if(rate+) > 200) rate-;if(rate-)=0) rate+;if(rate<rate_

9、value) mot = 0;else mot = 1;/ LCD 驱动函数部分 /#include"lcd.h"uchar i,s,g;uchar code table1="T_H: C T_L: C"uchar code table2="temperature: "uchar data temp0="0x00,0x00,0x00,0x00,0x00,0x00"void delayms(uint x)while(x-);/*LCD 写指令*/void LCD_com(uchar com)LCDRS = 0;del

10、ayms(100);P0 = com;delayms(100);LCDEN = 1;delayms(100);LCDEN = 0;delayms(100);/*LCD 写数据*/void LCD_dat(uchar dat)LCDRS = 1;delayms(100);P0 = dat;delayms(100);LCDEN = 1;delayms(100);LCDEN = 0;delayms(100);/*LCD地址*/void LCD_add(uchar add)LCD_com(add|0x80) ; /*LCD初始化*/void LCD_init()uchar i;LCDRS = 0;LC

11、DRW = 0;LCDEN = 0;LCD_com(0x38);LCD_com(0x38);LCD_com(0x38);LCD_com(0x0c);LCD_com(0x06);LCD_com(0x01);LCD_add(0x00);for(i=0;i<20;i+)LCD_dat(table1i);delayms(50);LCD_add(0x40);for(i=0;i<20;i+)LCD_dat(table2i);delayms(50);void display(uint temp)uchar temp_z,temp_x;uchar temp_h,temp_l; /*温度转换*/te

12、mp_h = (uchar)(temp>>8)&0x00ff);temp_l = (uchar)(temp&0x00f0);temp_z = (temp_h<<4)|(temp_l>>4);temp_x = (uchar)(temp&0x0000f)*0.625*10; /-/s = temp_z/10;g = temp_z%10;temp00 = s+0x30;temp01 = g+0x30;LCD_add(0x4c);for(i=0;i<2;i+) /写入温度整数位LCD_dat(temp0i);delayms(1000);

13、LCD_add(0x4e);LCD_dat(0x2e);/写入小数点LCD_add(0x4f);LCD_dat(temp_x/10+0x30);/写入温度小数位LCD_add(0x40+16); /在LCD第二行第16位置写入“口”LCD_dat(0xdf);LCD_add(0x40+17); /在LCD第二行第17位置写入“C”LCD_dat(0x43);/ DS18B20 驱动部分 /#include"18b20.h"uchar a,b;void delay_18b20(uchar z)while(z-);uchar init_18b20(void)uchar n;DQ

14、 = 1;delay_18b20(8); / 59usDQ = 0;delay_18b20(80); /491usDQ=1;delay_18b20(4);n = DQ; delay_18b20(15);return n;/返回值，判断是否有器件，n=1,有器件，n=0,没有器件/*DS18B20 的读写字节 都是从低位开始的*/void write_byte_18b20(uchar dat)uchar i;for(i=0;i<8;i+)DQ=0;DQ=dat&0x01;delay_18b20(4);DQ=1;/总线拉高，为下一次数据做准备dat>>=1;delay_1

15、8b20(4);uchar read_byte_18b20(void)uchar i,value;DQ = 1;for(i=0;i<8;i+)DQ=0;value>>=1;DQ=1;if(DQ=1)value|=0x80;delay_18b20(20);DQ = 1;return value;uint readtemperature(void)uchar flag;uint temp;flag = init_18b20();init_18b20();write_byte_18b20(0xcc);/跳过ROMwrite_byte_18b20(0x44);/启动温度测量delay

16、_18b20(50);/等待总线稳定init_18b20();write_byte_18b20(0xcc);write_byte_18b20(0xbe);a=read_byte_18b20();/读温度的低八位b=read_byte_18b20();/读温度的高八位if(flag) /检测是否有DS18B20，a = 0x00;b = 0x00;/*temp = (b<<4)|(a>>4);/整数部分temp_xs = (a&0x0f)*0.625*10;*/temp = (b<<8)|a;return temp;/ E2PROM 驱动部分 /#in

17、clude"at24c02.h"void delayus_24c02()_nop_();_nop_();_nop_();_nop_();_nop_();/*void delay_24c02(uchar z)uchar x,y;for(x=0;x<z;x+) for(y=0;y<100;y+); */void I2c_init(void)sda = 1;scl = 1;void start(void)sda = 1;scl = 1;delayus_24c02();sda = 0;delayus_24c02();scl = 0;delayus_24c02();voi

18、d stop(void)sda = 0;scl = 1;delayus_24c02();sda = 1;delayus_24c02();/*应答信号：在SCL由"0"变为"1"的期间，SDA=0；或者在数据读取完成后一定时间SDA没有变为"1" 这个过程被视为应答*/void ack(void)uchar i;scl=1; delayus_24c02();if(sda=1) && (i<250) i+;scl=0;delayus_24c02();void no_ack(void)sda = 1;delayus_24c02();scl = 1;delayus_24c02();scl = 0;delayus_24c02();void write_byte_24c02(uchar date)uchar i;scl = 0;delayus_24c02();for(i=0;i<8;i+)if(date&0x80) sda = 1;else sda = 0;date <<= 1;delayus_24c02();scl = 1;delayus