单片机：18B20温度传感器的程序：

这两句话是在读取18B20里面的数据，这个温度传感器是将温度已16个字节链雹上传的，高5位表示的时温度的正负，后面启戚12位表示的是无符号悄唤陵数值。最大精度为0.0625度。第一句是将16字节数据的低8位读出来，第二局是将数据的高8位读出来。

给你一个DS18B20的温度采集程序！

//ICC-AVR application builder : 2009-10-25 10:43:39

// Target : M16

// Crystal: 16.000Mhz

#include <iom16v.h>

#include <macros.h>

#define uint unsigned int

#define uchar unsigned char

#include "xianshi.c"

#include "delay.h"

#define CLR_DIR_1WIRE DDRD&=~BIT(4)//只要修改这里的参数就可以了

#define SET_DIR_1WIRE DDRD|=BIT(4) //里面什么都不用该！

#define CLR_OP_1WIRE PORTD&=~BIT(4)

#define SET_OP_1WIRE PORTD|=BIT(4)

#define CHECK_IP_1WIRE (PIND&0x10)//检测

unsigned char wmh,wml

void init_1820()

{

SET_DIR_1WIRE //设置PD4 为输出

SET_OP_1WIRE

CLR_OP_1WIRE

delay_nus(480) //480us以上

SET_OP_1WIRE

CLR_DIR_1WIRE

delay_nus(20) //15~60us

while(CHECK_IP_1WIRE)

SET_DIR_1WIRE

SET_OP_1WIRE

delay_nus(140) //60~240us

}

void write_1820(unsigned char x)

{

unsigned char m

for(m=0m<乎敏8m++)

{

CLR_OP_1WIRE

if(x&(1<<m))//写数巧森据了，先写低位的！

SET_OP_1WIRE

else

{CLR_OP_1WIRE}

delay_nus(40) //15~60us

SET_OP_1WIRE

}

SET_OP_1WIRE

}

unsigned char read_1820()

{

unsigned char temp,k,n

temp=0

for(n=0n<8n++)

{

CLR_OP_1WIRE

SET_OP_1WIRE

CLR_DIR_1WIRE

k=(CHECK_IP_1WIRE) //读数据,从低位开始

if(k)

temp|=(1<<n)

else

temp&=~(1<<n)

delay_nus(50)//60~120us

SET_DIR_1WIRE

}

return (temp)

}

unsigned int gettemp() //岁宽枝读取温度值

{

unsigned char temh,teml,wm0,wm1,wm2,wm3

init_1820() //复位18b20

write_1820(0xcc) // 发出转换命令

write_1820(0x44)

// delay_nms(800) //不延时也好使，不知道怎么回事！

init_1820()

write_1820(0xcc) //发出读命令

write_1820(0xbe)

teml=read_1820() //读数据

temh=read_1820()

wm0=teml>>4 //只要高8位的低四位和低8位的高四位，温度范围0~99啦！

wm1=temh<<4

wm2=wm1+wm0 //16进制转10进制

return wm2

}

void main()

{

uint tem,ad[4],i

port_init()

while(1)

{

tem = gettemp()

for(i=0i<4i++)

{

ad[3-i]=tem%10

tem=tem/10

}

for(i=0i<4i++)

{

show1(ad[i],i)

delay(5)

}

}

}

显示函数：

#include <iom16v.h>

#include <macros.h>

#define uint unsigned int

#define uchar unsigned char

#pragma data:code

const uint tab1[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,

0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0x00}//共阳数码管代码表

const uint tab2[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,

0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0X00}//共阴数码管代码表

void port_init(void)

{

DDRA = 0xFF

DDRB = 0xFF

DDRC = 0xFF

DDRD = 0x00

}

void delay(uint ms)

{

uint i,j

for(i=0i<msi++)

{

for(j=0j<1141j++)

}

}

void show1(uchar j,uchar k)//显示函数

{

PORTB = ~BIT(k)

PORTA = tab2[j]

delay(1)

}

void show(uint ada)

{

uint i,ad[4]

for(i=0i<4i++)

{

ad[3-i]=ada%10

ada = ada/10

}

while(1)

{

for(i=0i<4i++)

{

show1((ad[i]),i)

delay(100)

}

}

}

程序我都调试过的，都是好的，有不会再问我。可以给分了吗？嘿嘿

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