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王智，潘强，邢涛.面向物联网的实体实时搜索服务综述[D].中国科学院上海微系统与信息技术研究所.2009.

机械工业出版社《物联网技术概论》

无线模块.工业无线模块

李朝青.单片机原理及接口技术（简明修订版）[M].北京：北京航空航天大学出版社，1998.

匡宇国.智能传感器 SHT11 及其在便携式温湿度检测仪中的应用J].电子器件，2006.（04）.doi：10.3969/j.issn.1005-9490.2006.04.082.

黄文凯等Arduino开发实战指南：机器人卷[M].北京:机械工业出版社2014.6   1-43

#include <reg51.h>

#include <intrins.h> //内部函数，包含_nop_0空函数指令#define uchar unsigned char

#define uint unsigned int

sbit RS = P1^0; / 定义 LCD 模块控制引脚

sbit RW=P1^1;

sbit E=P1^2;

#define DataPort P2 //定义LCD 模块数据端口

#define Busy0x80 //忙标志，D7位为1说明忙

uchar Xpos; 11列方向地址指针

uchar Ypos; //行方向地址指针

//以下是短延时函数

void Delay5Ms(void){

uinti=5552;

while(i--);

}

void Delay400Ms(void)

{

unsigned char TempCycA = 5;

unsigned int TempCycB;

while(TempCycA--)

{

TempCycB=7269;

while(TempCycB--);

};

}

//以下是读忙状态函数

// 功能：在正常读写操作之前检测LCD模块的忙鬃刺?

//D7=0:LCD 控制器空闲；D7=1:LCD 控制器忙

void CheckBusy( void )

{

DataPort = Oxff; //P1 口写1

RS=0; //选择指令寄存器

RW=1; 11选择读模式

_nop_0;

E=1; //使能 LCD

_nop_0;

_nop_0;

while(DataPort & Busy)://若D7=1,则 DataPort&Busy=1,说明忙，等待E=0; //若 D7=0,说明不忙,令 E=0

}

//以下是写入 IR 寄存器命令函数

//功能：向LCD 模块写入命令字符CMD

//若 AttribC=1 检测忙信号，若 AttribC=0不检测忙信号

void WriteIR(uchar CMD,uchar AttribC)

{

if(AttribC)CheckBusyO://若AttribC=1则检测忙信号，否则，顺序执行RS=0; //选择指令寄存器

RW=0; //选择写模式

_nop_0;

DataPort = CMD; //将命令送数据端口

_nop_0;

E=1; //使能 LCD

_nop_0;

_nop_0;

E=0; //禁止LCD

}

//以下是写入 DDR 寄存器函数

//功能:在当前光标位置显示一个字符

void WriteDDR(charc)

{

CheckBusyO; //检测忙信号

RS=1; //选择数据寄存器

RW=0; 11选择写模式

_nop_0;

DataPort=c; // 将显示字符送往数据口

_nop_0;

E=1; //写使能

_nop_0;

_nop_0;

E=0; //禁止 LCD

}

//以下是光标定位函数

void LcdPos(uchar Xpos,uchar Ypos)

{

uchar tmp; //定义 tmp 为指令码

Xpos&=0x0f; //16xx 型液晶的范围是0~15

Ypos&=0x01; //Y 的范围是 0~1

tmp=Xpos;

if(Ypos==1)

tmpl=0xc0; //若 Ypos为1(显示第2 行),地址码+0xc0

tmpl=0x80； //若 Ypos为0(显示第1行)，地址码+0x80

WriteIR (tmp,0);

}

//以下是初始化函数

//功能：向LCD模块写入不同命令,完成必要的初始化过程

void LedReset( void )

{

Delay400Ms0;

WriteIR(0x30.0)://设为 8 位接口模式，显示 2 行字符.busv=0 不检测忙信号Delay5Ms0;

WriteIR(0x30,0);

Delay5Ms0;

WriteIR(0x30,0);

Delay5MsO;

WriteIR( 0x30,1)； //设置显示模式(以后均检测忙信号)

WriteIR( Ox08,1)； //显示开关控制指令,显示关闭

WriteIR(Ox01,1);；//清屏指令，将DDRAM数据全部填入”空白”

WriteIR(Ox06, 1); //输入方式设置指令,字符不动,光标自动右移一格WriteIR( OxOf, 1); //显示开关控制指令，显示器开，光标开，光标闪烁

}

//以下是在指定行列显示字符函数

void WriteChar(uchar Xpos,uchar Ypos,char c)

{

LcdPos(Xpos,Ypos);

WriteDDR(c);

}

//以下是显示字符串函数

void WriteString(uchar Xpos,uchar Ypos,char s[])

{

uchar p=0;

for(;;)

{

WriteChar(Xpos,Ypos,s[p]):

p++;

if(s[p]==0)

break;

if(++Xpos>=15) //每行最多显示16个字符

{

Xpos=0; //如果一行显示不完,则转到下一行或上一行的第一个字

符

Ypos=1；} /I如果一行显示不完，则转到下一行或上一行显示

}

}

//Filename:SHT10.c

//Author : Chen Fen

//Date：2008-8-26

//SHT10数字温湿度传感器的读写程序

#include <intrins.h>

#define uintunsigned int

uchar wendu,shidu,air,wendugao,wendudi,shidugao,shidudi,Mgao,Mdi;//定义要发送的温度和湿度 空气质量

// SHT10 interface

sbit SCK = P3^4; //define clock interface

sbit DATA = P3^0; //define data interface

sbit tem=P1^3;

sbit wet=P1^4;

sbit set=P1^5;

sbit add=P1^6;

sbit sub=P1^7;

typedef union

{ unsigned int i; //define two union

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 /1结束数据传输

//adr command t/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 Oxle //000 1111 0

void s_transstart(void)://启动传输函数

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

char s_write_byte(uchar value)://DHT90写函数

char s_read_byte(uchar ack); //DHT90 读函数

char s_measure(uchar *p_value, uchar *p_checksum,uchar mode);//测量温湿度函数void calc_dht90(float *p_humidity,float *p_temperature)://温湿度补偿

void Get_TH();

void Get_TH();

{

value humi_val,temp_val;

uchar error,checksum;

s_connectionresetO;

error=0;

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

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

if(error!=0) s_connectionreset(O; //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_dht90(&humi_val.f.&temp_val.f); //calculate humidity, temperature

wendu=temp_val.f;

shidu=humi_val.f;

}

}

void s_transstart(void)

// generates a transmission start

// DATA:

// SCK:

{

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

_nop_0;

SCK=1;

_nop_0;

DATA=0;

_nop_0;

SCK=0;

_nop_O:_nop_O:_nop_O;

SCK=1;

_nop_0;

DATA=1;

_nop_0; /

SCK=0;

}

void s_connectionreset(void)

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

// DATA:

// SCK:

{

uchar i；

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

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

{

SCK=1;

SCK=0;

}

s_transstart(O; //transmission start

}

char s_write_byte(uchar value)

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

{

uchar 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_0_nop_0:nop_O; //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

DHT90),DATA在第9个上升沿将被DHT90自动下拉为低电平。_nop_0:_nop_O:_nop_0;

SCK=0;

DATA=1; //release DATA-line

return error; //error=1 in case of no acknowledge //返回：0成功，

1失败

}

char s_read_byte(uchar ack)

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

{

uchar 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 li); //read bit

_nop_0:_nop_O_nop_O; //pulswith approx. 5 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_0:_nop_0:_nop_0; //pulswith approx. 5 us

SCK=1; //clk #9 for ack

_nop_0:_nop_0:_nop_O; //pulswith approx. 5 us

SCK=0;

_nop_0_nop_O:_nop_O; //pulswith approx. 5 us

DATA=1; //release DATA-line

return val;

}

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

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

{

unsigned error=0;

unsigned int i;

s_transstartO; //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_dht90(float *p_humidity ,float *p_temperature)

// 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; // th: 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; //_C ： Temperature [C]

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

rh_lin=C3*rh*rh + C2*rh + C1; //cale. 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

*p_temperature=L_C; //return temperature [C]

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

}

void delayms(uchar count) //延时 count ms 子程序

{

ucharij;

do

{

for(i=5;i>0;i--)

for(j=98:j>0;j--);

}while(--count);

}

void keepoffwendu(uchar nowtem)

{

wendugao=nowtem/10;

wendudi=nowtem%10;

wendugao=wendugao+'0';

wendudi=wendudi+0';

}

void keepoffshidu(uchar nowtem)

{

shidugao=nowtem/10;

shidudi=nowtem%10;

shidugao=shidugao+'0;

shidudi=shidudi+'0';

}

void keepoffM(uchar nowtem)

{

Mgao=nowtem/10;

Mdi=nowtem%10;

Mgao=Mgao+'0;

Mdi=Mdi+'0;

}

void showwendu(uchar shi,uchar ge)

{

LcdResetO;

WriteString(0,0,"tem:");

WriteChar(6,0,shi);

WriteChar(7,0.ge);

WriteChar(9,0,C");

}

void showshidu(uchar shi,uchar ge)

{

LcdResetO;

WriteString(0.0,"wet:");

WriteChar(6,0,shi);

WriteChar(7,0.ge);

WriteString(9,0,"%RH”);

}

void mainO

{

uchar M;

M=40;

s_connectionresetO; //

delayms(100);

while(1)

{

LcdResetO;

WriteString(0,0,"hello.");

if(tem==0)

{

TEM: while(1)

{

Get_TH0; //获得温度和湿度

keepoffwendu(wendu);

showwendu(wendugao,wendudi);

if(wet==0)

goto WET;

else if (set==0)

goto SET;

}

}

if(wet==0)

{

WET: while(1)

Get_THO; 1/获得温度和湿度

keepoffshidu(shidu);

showshidu(shidugao,shidudi);

if(tem==0)

goto TEM;

else if (set==0)

goto SET;

}

}

if(set==0)

{

while(1)

SET: while(1)

{

keepoffM(M);

showshidu(Mgao,Mdi);

if(add==0)

M=M+1;

else if (sub==0)

M=M-1;

else if (tem==0)

goto TEM;

else if (wet==0)

goto WET;

}

}

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