温湿度传感器的SHT10的使用例程（z）

该传感器低功耗，可以用在很多实际场合，只是价格上贵了一点。

温湿度传感器的SHT10代码如下：
[code]


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

功能说明:SHT10与上位机（串口调试助手）的温湿度显示



微处理器:STC89C52

编译环境:Keil uVision V4

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~











;*************************************************************/

#include <reg52.h> //Microcontroller specific library, e.g. port definitions

#include <intrins.h> //Keil library (is used for _nop()_ operation)

#include <math.h> //Keil library

#include <stdio.h> //Keil library



/*************定义接口******************

P2.6------SCK (SHT10)

P2.7------DATA (SHT10)

*****************************************/

sbit SCK = P2^6; //定义通讯时钟端口

sbit DATA = P2^7; //定义通讯数据端口

typedef union

{ unsigned int i; //定义了两个共用体

float f;

} value;

enum {TEMP,HUMI}; //枚举测量温度或湿度

#define noACK 0 //用于判断是否结束通讯

#define ACK 1 //结束数据传输

//adr command r/w

#define STATUS_REG_W 0x06 //000 0011 0

#define STATUS_REG_R 0x07 //000 0011 1

#define MEASURE_TEMP 0x03 //000 0001 1

#define MEASURE_HUMI 0x05 //000 0010 1

#define RESET 0x1e //000 1111 0

/****************定义函数****************/

void s_transstart(void); //启动传输函数

void s_connectionreset(void); //连接复位函数

char s_write_byte(unsigned char value);//SHT10写函数

char s_read_byte(unsigned char ack); //SHT10读函数

char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode);//测量温湿度函数

void calc_sht10(float *p_humidity ,float *p_temperature);//温湿度补偿

float calc_dewpoint(float h,float t); //计算露点

//char s_softreset(void);

//char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum);

//char s_write_statusreg(unsigned char *p_value);

/*--------------------------------------

;模块名称:s_write_byte();

;功 能:SHT10写函数

;占用资源:--

;参数说明:--

;创建日期:2012.04.10

;版 本:FV1.0(函数版本Function Version)

;修改日期:--

;修改说明:--

;-------------------------------------*/

char s_write_byte(unsigned char value)

// writes a byte on the Sensibus and checks the acknowledge

{

unsigned char i,error=0;

for (i=0x80;i>0;i/=2) //shift bit for masking

{ if (i & value) DATA=1; //masking value with i , write to SENSI-BUS

else DATA=0;

SCK=1; //clk for SENSI-BUS

_nop_();_nop_();_nop_(); //pulswith approx. 5 us

SCK=0;

}

DATA=1; //release DATA-line

SCK=1; //clk #9 for ack

error=DATA; //check ack (DATA will be pulled down by SHT11)

SCK=0;

return error; //error=1 in case of no acknowledge

}

/*--------------------------------------

;模块名称:s_read_byte();

;功 能:SHT10读函数

;占用资源:--

;参数说明:--

;创建日期:2012.04.10

;版 本:FV1.0(函数版本Function Version)

;修改日期:--

;修改说明:--

;-------------------------------------*/

char s_read_byte(unsigned char ack)

// reads a byte form the Sensibus and gives an acknowledge in case of "ack=1"

{

unsigned char i,val=0;

DATA=1; //release DATA-line

for (i=0x80;i>0;i/=2) //shift bit for masking

{ SCK=1; //clk for SENSI-BUS

if (DATA) val=(val | i); //read bit

SCK=0;

}

DATA=!ack; //in case of "ack==1" pull down DATA-Line

SCK=1; //clk #9 for ack

_nop_();_nop_();_nop_(); //pulswith approx. 5 us

SCK=0;

DATA=1; //release DATA-line

return val;

}

/*--------------------------------------

;模块名称:s_transstart();

;功 能:启动传输函数

;占用资源:--

;参数说明:--

;创建日期:2012.04.10

;版 本:FV1.0(函数版本Function Version)

;修改日期:--

;修改说明:--

;-------------------------------------*/

void s_transstart(void)

// generates a transmission start

// _____ ________

// DATA: |_______|

// ___ ___

// SCK : ___| |___| |______

{

DATA=1; SCK=0; //Initial state

_nop_();

SCK=1;

_nop_();

DATA=0;

_nop_();

SCK=0;

_nop_();_nop_();_nop_();

SCK=1;

_nop_();

DATA=1;

_nop_();

SCK=0;

}

/*--------------------------------------

;模块名称:s_connectionreset();

;功 能:连接复位函数

;占用资源:--

;参数说明:--

;创建日期:2012.04.10

;版 本:FV1.0(函数版本Function Version)

;修改日期:--

;修改说明:--

;-------------------------------------*/

void s_connectionreset(void)

// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart

// _____________________________________________________ ________

// DATA: |_______|

// _ _ _ _ _ _ _ _ _ ___ ___

// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______

{

unsigned char i;

DATA=1; SCK=0; //Initial state

for(i=0;i<9;i++) //9 SCK cycles

{ SCK=1;

SCK=0;

}

s_transstart(); //transmission start

}

/*

//----------------------------------------------------------------------------------

char s_softreset(void)

//----------------------------------------------------------------------------------

// resets the sensor by a softreset

{

unsigned char error=0;

s_connectionreset(); //reset communication

error+=s_write_byte(RESET); //send RESET-command to sensor

return error; //error=1 in case of no response form the sensor

}



//----------------------------------------------------------------------------------

char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum)

//----------------------------------------------------------------------------------

// reads the status register with checksum (8-bit)

{

unsigned char error=0;

s_transstart(); //transmission start

error=s_write_byte(STATUS_REG_R); //send command to sensor

*p_value=s_read_byte(ACK); //read status register (8-bit)

*p_checksum=s_read_byte(noACK); //read checksum (8-bit)

return error; //error=1 in case of no response form the sensor

}



//----------------------------------------------------------------------------------

char s_write_statusreg(unsigned char *p_value)

//----------------------------------------------------------------------------------

// writes the status register with checksum (8-bit)

{

unsigned char error=0;

s_transstart(); //transmission start

error+=s_write_byte(STATUS_REG_W);//send command to sensor

error+=s_write_byte(*p_value); //send value of status register

return error; //error>=1 in case of no response form the sensor

}

*/

/*--------------------------------------

;模块名称:s_measure();

;功 能:测量温湿度函数

;占用资源:--

;参数说明:--

;创建日期:2012.04.10

;版 本:FV1.0(函数版本Function Version)

;修改日期:--

;修改说明:--

;-------------------------------------*/

char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)

// makes a measurement (humidity/temperature) with checksum

{

unsigned error=0;

unsigned int i;



s_transstart(); //transmission start

switch(mode){ //send command to sensor

case TEMP : error+=s_write_byte(MEASURE_TEMP); break;

case HUMI : error+=s_write_byte(MEASURE_HUMI); break;

default : break;

}

for (i=0;i<65535;i++) if(DATA==0) break; //wait until sensor has finished the measurement

if(DATA) error+=1; // or timeout (~2 sec.) is reached

* (p_value)=s_read_byte(ACK); //read the first byte (MSB)

*(p_value+1) =s_read_byte(ACK); //read the second byte (LSB)

*p_checksum =s_read_byte(noACK); //read checksum

return error;

}

/*--------------------------------------

;模块名称:init_uart();

;功 能:串口初始化

;占用资源:--

;参数说明:--

;创建日期:2012.04.10

;版 本:FV1.0(函数版本Function Version)

;修改日期:--

;修改说明:--

;-------------------------------------*/

void init_uart()

//9600 bps @ 11.059 MHz

{SCON = 0x52;

TMOD = 0x20;

TCON = 0x69;

TH1 = 0xfd;

}

/*--------------------------------------

;模块名称:calc_sht10();

;功 能:温湿度补偿函数

;占用资源:--

;参数说明:--

;创建日期:2012.04.10

;版

本:FV1.0(函数版本Function Version)

;修改日期:--

;修改说明:--

;-------------------------------------*/

void calc_sth11(float *p_humidity ,float *p_temperature)

// calculates temperature [℃] and humidity [%RH]

// input : humi [Ticks] (12 bit)

// temp [Ticks] (14 bit)

// output: humi [%RH]

// temp [℃]

{ const float C1=-4.0; // for 12 Bit

const float C2=+0.0405; // for 12 Bit

const float C3=-0.0000028; // for 12 Bit

const float T1=+0.01; // for 14 Bit @ 5V

const float T2=+0.00008; // for 14 Bit @ 5V



float rh=*p_humidity; // rh: Humidity [Ticks] 12 Bit

float t=*p_temperature; // t: Temperature [Ticks] 14 Bit

float rh_lin; // rh_lin: Humidity linear

float rh_true; // rh_true: Temperature compensated humidity

float t_C; // t_C : Temperature [℃]



t_C=t*0.01 - 40; //calc. temperature from ticks to [℃]

rh_lin=C3*rh*rh + C2*rh + C1; //calc. humidity from ticks to [%RH]

rh_true=(t_C-25)*(T1+T2*rh)+rh_lin; //calc. temperature compensated humidity [%RH]

if(rh_true>100)rh_true=100; //cut if the value is outside of

if(rh_true<0.1)rh_true=0.1; //the physical possible range



*p_temperature=t_C; //return temperature [℃]

*p_humidity=rh_true; //return humidity[%RH]

}

/*--------------------------------------

;模块名称:calc_dewpoint();

;功 能:露点，空气湿度达到饱和时的温度

;占用资源:--

;参数说明:--

;创建日期:2012.04.10

;版 本:FV1.0(函数版本Function Version)

;修改日期:--

;修改说明:--

;-------------------------------------*/

float calc_dewpoint(float h,float t)

// calculates dew point

// input: humidity [%RH], temperature [℃]

// output: dew point [℃]

{ float logEx,dew_point;

logEx=0.66077+7.5*t/(237.3+t)+(log10(h)-2);

dew_point = (logEx - 0.66077)*237.3/(0.66077+7.5-logEx);

return dew_point;

}

/*****************主函数*********************/

//----------------------------------------------------------------------------------

void main()

//----------------------------------------------------------------------------------

// sample program that shows how to use SHT11 functions

// 1. connection reset

// 2. measure humidity [ticks](12 bit) and temperature [ticks](14 bit)

// 3. calculate humidity [%RH] and temperature [℃]

// 4. calculate dew point [℃]

// 5. print temperature, humidity, dew point



{ value humi_val,temp_val;

float dew_point;

unsigned char error,checksum;

unsigned int i;

init_uart(); //串口初始化

s_connectionreset();

while(1)

{ error=0;

error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); //measure humidity

error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); //measure temperature

if(error!=0) s_connectionreset(); //in case of an error: connection reset

else

{ humi_val.f=(float)humi_val.i; //converts integer to float

temp_val.f=(float)temp_val.i; //converts integer to float

calc_sth11(&humi_val.f,&temp_val.f); //calculate humidity, temperature

dew_point=calc_dewpoint(humi_val.f,temp_val.f); //calculate dew point

printf("Temp:%5.1f℃ Humi:%5.1f%% Dew point:%5.1f℃\n",temp_val.f,humi_val.f,dew_point);

}

//----------wait approx. 0.8s to avoid heating up SHTxx------------------------------

for (i=0;i<40000;i++); //(be sure that the compiler doesn't eliminate this line!)

//-----------------------------------------------------------------------------------

}

}
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