上位机显示并存储，RS485传输温湿度监控系统（SHT11传感器20个点位） -

/***********************************************************************************
;功能说明:SHT11与LCD1602的温湿度显示
;文件名称:SHT11.c
;***********************************************************************************/
/*************定义接口********************
P0------DB0～DB7 (LCD1602)
P2.0------RS (LCD1602)
P2.1------RW (LCD1602)
P2.2------E (LCD1602)
P2.6------SCK (SHT11)
P2.7------DATA (SHT11)
*****************************************/
#include <reg52.h>
#include <intrins.h>
#include <math.h>
#include <stdio.h>
//第一部分LCD1602设置
#define LCD_DB P0
sbit LCD_RS=P2^0;
sbit LCD_RW=P2^1;
sbit LCD_E=P2^2;
/******定义函数****************/
#define uchar unsigned char
#define uint unsigned int
void LCD_init(void); //初始化函数
void LCD_write_command(uchar command); //写指令函数
void LCD_write_data(uchar dat); //写数据函数
void LCD_disp_char(uchar x,uchar y,uchar dat);//在某个屏幕位置上显示一个字符,X（0-15),y(1-2)
void LCD_disp_str(uchar x,uchar y,uchar *str); //LCD1602显示字符串函数
void delay_n10us(uint n); //延时函数
/*--------------------------------------
;模块名称:LCD_init();
;功能:初始化LCD1602
;-------------------------------------*/
void LCD_init(void)
{
delay_n10us(10);
LCD_write_command(0x38);//设置8位格式，2行，5x7
delay_n10us(10);
LCD_write_command(0x0c);//整体显示，关光标，不闪烁
delay_n10us(10);
LCD_write_command(0x06);//设定输入方式，增量不移位
delay_n10us(10);
LCD_write_command(0x01);//清除屏幕显示
delay_n10us(100); //延时清屏，延时函数，延时约n个10us
}
/*--------------------------------------
;模块名称:LCD_write_command();
;功能:LCD1602写指令函数
;-------------------------------------*/
void LCD_write_command(uchar dat)
{
delay_n10us(10);
LCD_RS=0; //指令
LCD_RW=0; //写入
LCD_E=1; //允许
LCD_DB=dat;
delay_n10us(10); //实践证明，我的LCD1602上，用for循环1次就能完成普通写指令。
LCD_E=0;
delay_n10us(10); //实践证明，我的LCD1602上，用for循环1次就能完成普通写指令。
}
/*--------------------------------------
;模块名称:LCD_write_data();
;功能:LCD1602写数据函数
;-------------------------------------*/
void LCD_write_data(uchar dat)
{
delay_n10us(10);
LCD_RS=1; //数据
LCD_RW=0; //写入
LCD_E=1; //允许
LCD_DB=dat;
delay_n10us(10);
LCD_E=0;
delay_n10us(10);
}
/*--------------------------------------
;模块名称:LCD_disp_char();
;功能:LCD1602显示一个字符函数
;-------------------------------------*/
void LCD_disp_char(uchar x,uchar y,uchar dat)
{
uchar address;
if(y==1)
address=0x80+x;
else
address=0xc0+x;
LCD_write_command(address);
LCD_write_data(dat);
}
/*--------------------------------------
;模块名称:LCD_disp_str();
;功能:LCD1602显示字符串
;-------------------------------------*/
void LCD_disp_str(uchar x,uchar y,uchar *str)
{
uchar address;
if(y==1)
address=0x80+x;
else
address=0xc0+x;
LCD_write_command(address);
while(*str!='\0')
{
LCD_write_data(*str);
str++;
}
}
/*--------------------------------------
;模块名称:delay_n10us();
;功能:延时函数，延时约n个10us
;-------------------------------------*/
void delay_n10us(uint n) //延时n个10us@12M晶振
{
uint i;
for(i=n;i>0;i--)
{
_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
}
}
//第二部分SHT11设置
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}; //TEMP=0,HUMI=1
#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);//SHT11写函数
char s_read_byte(unsigned char ack); //SHT11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_SHT11(float *p_humidity ,float *p_temperature);//温湿度补偿
/*--------------------------------------
;模块名称:s_transstart();
;功能:启动传输函数
;-------------------------------------*/
void s_transstart(void)
{
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
;-------------------------------------*/
void s_connectionreset(void)
{
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
}
/*--------------------------------------
;模块名称:s_write_byte();
;功能:SHT11写函数
;-------------------------------------*/
char s_write_byte(unsigned char value)
//----------------------------------------------------------------------------------
{
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. 3 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),DATA在第9个上升沿将被SHT11自动下拉为低电平。
_nop_();_nop_();_nop_();
SCK=0;
DATA=1; //release DATA-line
return error; //error=1 in case of no acknowledge //返回：0成功，1失败
}
/*--------------------------------------
;模块名称:s_read_byte();
;功能:DHT11读函数
;-------------------------------------*/
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
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=0;
}
if(ack==1)DATA=0; //in case of "ack==1" pull down DATA-Line
else DATA=1; //如果是校验(ack==0)，读取完后结束通讯
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=1; //clk #9 for ack
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=0;
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
DATA=1; //release DATA-line
return val;
}
/*--------------------------------------
;模块名称:s_measure();
;功能:测量温湿度函数
;-------------------------------------*/
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:calc_SHT11();
;功能:温湿度补偿函数
;-------------------------------------*/
void calc_SHT11(float *p_humidity ,float *p_temperature)
{ 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 [C]
t_C=t*0.01 - 40; //calc. temperature from ticks to [C]
rh_lin=C3*rh*rh + C2*rh + C1; //calc. humidity from ticks to [%RH]
rh_true=(t_C-25)*(T1+T2*rh)+rh_lin-3; //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 [C]
*p_humidity=rh_true; //return humidity[%RH]
}
//*********主函数*****************
void main(void)
{
value humi_val,temp_val;
unsigned char error,checksum;
unsigned int wendu,shidu;
LCD_init();
s_connectionreset();
LCD_disp_str(0,1,"TE");
LCD_disp_str(0,2,"RH");
LCD_disp_str(2,1,"T");
LCD_disp_str(2,2,"R");
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_SHT11(&humi_val.f,&temp_val.f); //calculate humidity, temperature
wendu=10*temp_val.f;
LCD_disp_char(2,1,wendu/1000+'0'); //显示温度百位
LCD_disp_char(3,1,(wendu%1000)/100+'0'); //显示温度十位
LCD_disp_char(4,1,(wendu%100)/10+'0'); //显示温度个位
LCD_disp_char(6,1,(wendu%10)+'0'); //显示温度小数点后第一位
shidu=10*humi_val.f;
LCD_disp_char(2,2,shidu/1000+'0'); //显示湿度百位
LCD_disp_char(3,2,(shidu%1000)/100+'0'); //显示湿度十位
LCD_disp_char(4,2,(shidu%100)/10+'0'); //显示湿度个位
LCD_disp_char(6,2,(shidu%10)+'0'); //显示湿度小数点后第一位
}
}
}

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