最近用到了HR202網(wǎng)上的資料實在是太少了，按照數(shù)據(jù)手冊上寫的程序更少，沒辦法，自己一點一點的敲吧！！
      首先你得確定普通的51單片機不能按照數(shù)據(jù)手冊上的方法，沒有方向寄存器的雙向IO口充電時間很難確定。
本實驗使用的是LCD1602,HR202,STC12LE60S2

J15，J16，J17分別和P1.3,P1.4，P1.5相連
實驗代碼如下，1602的驅(qū)動找度娘吧，貼上來有點亂

#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;    //精確到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;//都設(shè)置為0，讓電容放點
  hr202 = 0;
  ref = 0;
  delayms(10);
  //標(biāo)準(zhǔn)電阻充電
  P1M1 = 0X28; //高阻輸入
  ref = 1;
  TR0 = 1;//start time0
  while(!test);
  TR0 = 0;//STOP
  time_ref = 50000*time0int + (TH0*256+TL0);//精確到us
  TH0 = (65536-50000)/256;
  TL0 = (65536-50000)%6;
  time0int = 0;
  //放電
  P1M1 = 0X00;
  test = 0;//都設(shè)置為0，讓電容放點
  hr202 = 0;
  ref = 0;
  delayms(10);

  //hr202充電
  P1M1 = 0X30;
  hr202 = 1;
  TR0 = 1;
  while(!test);
  TR0 = 0;
  time_hr = 50000*time0int + (TH0*256+TL0);//精確到us
  TH0 = (65536-50000)/256;
  TL0 = (65536-50000)%6;
  time0int = 0;
 
  //計算hr202電阻
  res_hr = time_hr*100/time_ref;     //結(jié)果擴大了10倍
  res2humidity(res_hr);
  Write_Char(0xc0,humidity/10+48);
  Write_Char(0xc1,humidity+48);
 }
}

//查表函數(shù)
void res2humidity(unsigned int res)
{
  unsigned char humidity10 = 0; //十位
  unsigned char humidity1 = 0;//個位
  if((res>28)&&(res<50000))//濕度范圍在20%~90%之間
  {
    if((res>28)&&(res<40))
    {humidity10 = 8;humidity1 = 10 - (res-28)*0.4;}    //按直線關(guān)系處理 數(shù)據(jù)不是太準(zhǔn)確
    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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