J15，J16，J17分别和P1.3,P1.4，P1.5相连

实验代码如下，1602的驱动找度娘吧，贴上来有点乱

#include"reg52.h"

#include "typedef.h"

#include "LCD1602.H"

sbit hr202 = P1^3;

sbit ref = P1^4;

sbit test = P1^5;

unsigned long time0int = 0;

unsigned long time_ref = 0; //精确到us

unsigned long time_hr = 0;

unsigned int res_hr;

unsigned char humidity = 0;

void res2humidity(unsigned int res);

void Time0_Init()

{

TMOD = 0X01;

TH0 = (65536-50000)/256;

TL0 = (65536-50000)%6;

ET0 = 1;

EA = 1;

}

void main()

{

Lcd_Init();

Write_String(0x80,"humidity:");

Time0_Init();

while(1)

{

P1M1 = 0X00;

test = 0;//都设置为0，让电容放点

hr202 = 0;

ref = 0;

delayms(10);

//标准电阻充电

P1M1 = 0X28; //高阻输入

ref = 1;

TR0 = 1;//start time0

while(!test);

TR0 = 0;//STOP

time_ref = 50000*time0int + (TH0*256+TL0);//精确到us

TH0 = (65536-50000)/256;

TL0 = (65536-50000)%6;

time0int = 0;

//放电

P1M1 = 0X00;

test = 0;//都设置为0，让电容放点

hr202 = 0;

ref = 0;

delayms(10);

//hr202充电

P1M1 = 0X30;

hr202 = 1;

TR0 = 1;

while(!test);

TR0 = 0;

time_hr = 50000*time0int + (TH0*256+TL0);//精确到us

TH0 = (65536-50000)/256;

TL0 = (65536-50000)%6;

time0int = 0;

//计算hr202电阻

res_hr = time_hr*100/time_ref; //结果扩大了10倍

res2humidity(res_hr);

Write_Char(0xc0,humidity/10+48);

Write_Char(0xc1,humidity+48);

}

}

//查表函数

void res2humidity(unsigned int res)

{

unsigned char humidity10 = 0; //十位

unsigned char humidity1 = 0;//个位

if((res>28)&&(res<50000))//湿度范围在20%~90%之间

{

if((res>28)&&(res<40))

{humidity10 = 8;humidity1 = 10 - (res-28)*0.4;} //按直线关系处理 数据不是太准确

if((res>40)&&(res<57))

{humidity10 = 8;humidity1 = 5 - (res-40)*0.29;}

if((res>57)&&(res<84))

{humidity10 = 7;humidity1 = 10 - (res-57)*0.185;}

if((res>84)&&(res<130))

{humidity10 = 7;humidity1 = 5 - (res-84)*0.11;}

if((res>130)&&(res<195))

{humidity10 = 6;humidity1 = 10 - (res-130)*0.076;}

if((res>195)&&(res<310))

{humidity10 = 6;humidity1 = 5 - (res-195)*0.043;}

if((res>310)&&(res<490))

{humidity10 = 5;humidity1 = 10 - (res-310)*0.027;}

if((res>490)&&(res<870))

{humidity10 = 5;humidity1 = 5 - (res-490)*0.0131;}

if((res>870)&&(res<1600))

{humidity10 = 4;humidity1 = 10 - (res-870)*0.0068;}

if((res>1600)&&(res<3100))

{humidity10 = 4;humidity1 = 5 - (res/100-16)*0.33;}

if((res>3100)&&(res<6300))

{humidity10 = 3;humidity1 = 10 - (res/100-31)*0.156;}

if((res>6300)&&(res<13000))

{humidity10 = 3;humidity1 = 5 - (res/100-63)*0.07;}

if((res>13000)&&(res<26000))

{humidity10 = 2;humidity1 = 10 - (res/1000-13)*0.38;}

if((res>26000)&&(res<5000))

{humidity10 = 2;humidity1 = 5 - (res/1000-26)*0.208;}

}

humidity = humidity10*10+humidity1;

}

void time0_ser() interrupt 1

{

time0int++;

TH0 = (65536-50000)/256;

TL0 = (65536-50000)%6;

}

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