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/*************端口定義********************
P1.0------SCK (SHT11)
P1.1------DATA (SHT11)
P0------DB0～DB7 (LCD1602)
P2.0------RS (LCD1602)
P2.1------RW (LCD1602)
P2.2------E (LCD1602)
*****************************************/
#include <reg52.h>
#include <intrins.h>
#include <stdio.h>
#include <string.h>
#include <absacc.h>
#include <math.h>
#define uchar unsigned char
#define uint unsigned int
#define TEMPUP 25 //溫度上限
#define TEMPDOWN 18 //溫度下限
#define HUMDOWN 45 //濕度上限
#define HUMUP 75 //濕度下限
sbit LcdRs= P2^0; //1602液晶端口定義
sbit LcdRw= P2^1;
sbit LcdEn= P2^2;
sbit led1 =P3^0; //報警燈端口定義
sbit led2 =P3^4;
sbit beep =P3^1; //定義蜂鳴器端口
sbit ACC0 = ACC^0;
sbit ACC7 = ACC^7;
/******************************************************************/
/* 延時函數聲明 */
/******************************************************************/
void mdelay(unsigned int t)
{
unsigned char n;
for(;t>0;t--)
for(n=0;n<125;n++)
{;}
}
bit start;
uchar str[7];
//向LCD寫入命令或數據************************************************************
#define LCD_COMMAND 0 // Command
#define LCD_DATA 1 // Data
#define LCD_CLEAR_SCREEN 0x01 // 清屏
#define LCD_HOMING 0x02 // 光標返回原點
//設置顯示模式************************************************************
#define LCD_SHOW 0x04 //顯示開
#define LCD_HIDE 0x00 //顯示關
#define LCD_CURSOR 0x02 //顯示光標
#define LCD_NO_CURSOR 0x00 //無光標
#define LCD_FLASH 0x01 //光標閃動
#define LCD_NO_FLASH 0x00 //光標不閃動
//設置輸入模式************************************************************
#define LCD_AC_UP 0x02
#define LCD_AC_DOWN 0x00 // default
#define LCD_MOVE 0x01 // 畫面可平移
#define LCD_NO_MOVE 0x00 //default
unsigned char LCD_Wait(void);
void LCD_Write(bit style, unsigned char input);
/***********1602液晶顯示部分子程序****************/
void delay(uint z) //延時函數
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void LCD_Write(bit style, unsigned char input)
{
LcdRs=style;
P0=input;
delay(5);
LcdEn=1;
delay(5);
LcdEn=0;
}
void LCD_SetDisplay(unsigned char DisplayMode) //設置輸出
{
LCD_Write(LCD_COMMAND, 0x08|DisplayMode);
}
void LCD_SetInput(unsigned char InputMode) //設置輸入
{
LCD_Write(LCD_COMMAND, 0x04|InputMode);
}
void LCD_Initial() //初始化LCD函數
{
LcdEn=0;
LCD_Write(LCD_COMMAND,0x38); //8位數據端口,2行顯示,5*7點陣
LCD_Write(LCD_COMMAND,0x38);
LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR); //開啟顯示, 無光標
LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN); //清屏
LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE); //AC遞增, 畫面不動
}
void GotoXY(unsigned char x, unsigned char y) //液晶字符輸入的位置
{
if(y==0)
LCD_Write(LCD_COMMAND,0x80|x);
if(y==1)
LCD_Write(LCD_COMMAND,0x80|(x-0x40));
}
void Print(unsigned char *str) //將字符輸出到液晶顯示
{
while(*str!='\0')
{
LCD_Write(LCD_DATA,*str);
str++;
}
}
void zhuanhuan(float a)//浮點數轉換成字符串函數
{
memset(str,0,sizeof(str));
sprintf (str,"%f", a);
}
void welcome() //初始界面函數
{
LCD_Initial();
GotoXY(0,0);
Print(" Welcome! ");
GotoXY(0,1);
Print(" Code of sht11 ");
delay(200);
}
void delay_n10us(uint n) //延時n個10us@12M晶振
{
uint i;
for(i=n;i>0;i--)
{
_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();
}
}
/*********************第一部分LCD1602設置 END****************************************/
/*********************第二部分SHT11設置 START**************************************/
sbit SCK = P1^0; //定義通訊時鐘端口
sbit DATA = P1^1; //定義通訊數據端口
typedef union
{ unsigned int i; //定義了兩個共用體
float f;
} value;
enum {TEMP,HUMI}; //TEMP=0,HUMI=1
#define noACK 0 //用于判斷是否結束通訊
#define ACK 1 //結束數據傳輸
//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
/****************定義函數****************/
void s_transstart(void); //啟動傳輸函數
void s_connectionreset(void); //連接復位函數
char s_write_byte(unsigned char value);//SHT11寫函數
char s_read_byte(unsigned char ack); //SHT11讀函數
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode);//測量溫濕度函數
void calc_dht90(float *p_humidity ,float *p_temperature);//溫濕度補償
void s_transstart(void) //啟動傳輸函數
// 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;
}
void s_connectionreset(void) //連接復位函數
// 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_write_byte(unsigned char value) // SHT11寫字節函數
//----------------------------------------------------------------------------------
// 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. 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 DHT90),DATA在第9個上升沿將被DHT90自動下拉為低電平。
_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失敗
}
/*****SHT11讀函數 reads a byte form the Sensibus
and gives an acknowledge in case of "ack=1"****/
char s_read_byte(unsigned char ack)
{
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; //如果是校驗(ack==0)，讀取完后結束通訊
_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;
}
/* 測量溫濕度函數 makes a measurement
(humidity/temperature) with checksum */
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
{
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;
}
void calc_sht90(float *p_humidity ,float *p_temperature) //溫濕度補償函數
// calculates temperature [C] and humidity [%RH]
// input : humi [Ticks] (12 bit)
// temp [Ticks] (14 bit)
// output: humi [%RH]
// temp [C]
{ 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; //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]
}
/**************第二部分SHT11設置 END*****************************/
/***************************主函數************************************/
void main(void)
{
int a,b;
value humi_val,temp_val;
unsigned char error,checksum,i;
LcdRw=0;
led1=0;
led2=0;
beep=1;
start=0;
s_connectionreset();
welcome();//顯示歡迎畫面
delay(2000);
LCD_Initial();
while(1)
{ error=0;
error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI);
error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP);
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_sht90(&humi_val.f,&temp_val.f); //計算濕度與溫度
GotoXY(0,0);//
Print("Tep:");
GotoXY(0,1);
Print("Hum:");
zhuanhuan(temp_val.f); //轉換溫度為uchar方便液晶顯示
GotoXY(5,0);
str[5]=0xDF;//℃的符號
str[6]=0x43;
str[7]='\0';
Print(str);
if( temp_val.f>TEMPUP-1 || temp_val.f<TEMPDOWN-1 )
{
//led1=1;
// beep=1;
a=1;
}
else
{
//led1=0;
// beep=0;
a=0 ;
}
zhuanhuan(humi_val.f);//轉換濕度為uchar方便液晶顯示
GotoXY(5,1);
str[5]='%';//%的符號
str[6]='\0';//字符串結束標志
Print(str);
if( humi_val.f>HUMUP-1 || humi_val.f<HUMDOWN-1 )
// { led2=1;
// beep2=1;}
{
//led2=1;
// beep=1;
b=1;
}
else
{
//led2=0;
// beep=0;
b=0;
}
if(a==1&&b==1)
{
led1=1;
led2=1;
beep=0;
}
else if(a==1&&b==0)
{
led1=1;
led2=0;
beep=0;
}
else if(a==0&&b==1)
{
led1=0;
led2=1;
beep=0;
}
else if(a==0&&b==0)
{
led1=0;
led2=0;
beep=1;
}
// if(a==1||b==1)
// beep=1;
// else
// beep=0;
// a=b=0;
}
delay_n10us(80000); //延時約0.8s
}
}

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