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#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
int temp;
typedef unsigned int u16; //對(duì)數(shù)據(jù)類型進(jìn)行聲明定義
typedef unsigned char u8;
sbit LCDE=P1^2;
sbit RS=P1^0;
sbit RW=P1^1;
sbit ADCS=P2^0; //ADC0832 chip seclect
sbit ADDO=P3^7; //ADC0832 k in
sbit ADDI=P3^7; //ADC0832 k in
sbit ADCLK=P3^6; //ADC0832 clock signal
sbit DHTIO=P2^1; //DHT11輸出
sbit LED=P2^7; //LED脈沖驅(qū)動(dòng)
unsigned char code digit[10]={"0123456789"};
volatile uchar K=0;//AD轉(zhuǎn)換數(shù)字量
uint tempshi,tempge,humshi,humge;
unsigned char U8FLAG=0,U8temp=0;
unsigned char U8T_data_H=0,U8T_data_L=0,U8RH_data_H=0,U8RH_data_L=0,U8checkdata=0;
unsigned char str[5];
//humidity 濕度
//temperature 溫度
//integer 整數(shù)
//decimal 小數(shù)
unsigned char humidity_interger=0,humidity_decimal;
unsigned char temperature_integer=0,temperature_decimal;
unsigned char check;
void delay(unsigned int z) //延時(shí)長(zhǎng)
{
unsigned char x,y;
for(x=z;x>0;x--)
{
for(y=20;y>0;y--);
}
}
void delay40us()
{
unsigned char a,b;
for(b=3;b>0;b--)
for(a=4;a>0;a--);
}
void delayms(uint del)
{
uint u,v;
for(u=0;u<del;u++)
for(v=0;v<=100;v++);
}
void delay20ms()
{
unsigned char a,b,c;
for(c=1;c>0;c--)
for(b=222;b>0;b--)
for(a=40;a>0;a--);
}
unsigned char Adc0832() //AD轉(zhuǎn)換,返回結(jié)果
{
uchar u=0;
uchar dat=0;
ADCLK=0;
delayms(1);
ADCS=0;//拉低CS端
delayms(1);
ADDI=1;
delayms(1);
ADCLK=1;//拉高CLK端
delayms(1);
ADCLK=0;//拉低CLK端,形成下降沿1
delayms(1);
ADCLK=1;//拉高CLK端
ADDI=1;
delayms(1);
ADCLK=0;//拉低CLK端,形成下降沿2
delayms(1);
ADCLK=1;//拉高CLK端
ADDI=1;
delayms(1);
ADCLK=0;//拉低CLK端,形成下降沿3
delayms(1);
ADDI=1;//控制命令結(jié)束
delayms(1);
dat=0;
for(u=0;u<8;u++)
{
ADCLK=1;
delayms(1);
ADCLK=0;//形成一次時(shí)鐘脈沖
delayms(1);
dat|=ADDO;//收數(shù)據(jù)
if(u<7)
dat<<=1;
}
for(u=0;u<8;u++)
{
ADCLK=1;
delayms(1);
ADCLK=0;//形成一次時(shí)鐘脈沖
delayms(1);
}
ADCS=1;//拉低CS端
ADCLK=0;//拉低CLK端
ADDO=1;//拉高數(shù)據(jù)端,回到初始狀態(tài)
return dat; //return ad k
}
void dht_start() //等待接受初始化
{
DHTIO=1; //初始高電平
delay40us();
DHTIO=0; //主機(jī)拉低電平
delay20ms(); //保持電平時(shí)間大于18ms
DHTIO=1; //主機(jī)拉高電平
delay40us(); //延遲等待20-40us等待從機(jī)響應(yīng)
}
unsigned char recieve_data() //數(shù)據(jù)接收
{
unsigned char i,flag,data_byte;
for(i=0;i<8;i++)
{
flag=2;
while((!DHTIO)&&flag++);//等待從機(jī)發(fā)出50us低電平結(jié)束
delay40us(); //延時(shí)超過(guò)26us-28us不超過(guò)70us
data_byte=data_byte<<1;
if(DHTIO) //如果此時(shí)dhtio為1則表示此時(shí)從機(jī)輸出數(shù)據(jù)為1否則說(shuō)明此時(shí)從機(jī)輸出數(shù)據(jù)為0
{
data_byte|=0x01;
flag=2;
while((DHTIO)&&flag++);//等待剩下的高電平結(jié)束
}
if(!flag)
break;
}
return data_byte;
}
void dht_take_sample() //采樣
{
unsigned char flag;
dht_start();
if(!DHTIO) //從機(jī)發(fā)出響應(yīng)信號(hào)
{
flag=2;
while((!DHTIO)&&flag++);//檢測(cè)從機(jī)發(fā)出80us低電平是否結(jié)束
flag=2;
while((DHTIO)&&flag++); //檢測(cè)從機(jī)發(fā)出80us高電平是否結(jié)束
//開(kāi)始采集數(shù)據(jù)
humidity_interger=recieve_data(); //采集濕度整數(shù)部分
humidity_decimal=recieve_data(); //采集濕度小數(shù)部分
temperature_integer=recieve_data(); //采集溫度整數(shù)部分
temperature_decimal=recieve_data(); //采集溫度小數(shù)部分
check=recieve_data(); //采集校驗(yàn)位
DHTIO=1; //采集數(shù)據(jù)后主機(jī)拉高電平
}
}
void write_com(unsigned char com) //將模式設(shè)置指令或顯示地址寫入液晶模塊
{
RS=0;
RW=0;
LCDE=0;
P0=com;
delay(5);
LCDE=1;
delay(5);
LCDE=0;
}
void write_date(unsigned char date)//將數(shù)據(jù)（字符ASCII碼）寫入液晶模塊
{
RS=1;
RW=0;
LCDE=0;
P0=date;
delay(5);
LCDE=1;
delay(5);
LCDE=0;
}
void L1602_string(unsigned char hang,unsigned char lie,unsigned char p) //將數(shù)據(jù)寫入液晶模塊
{
unsigned char a;
if(hang == 1) a = 0x80; //顯示在第一行
if(hang == 2) a = 0xc0; //顯示在第一行
a = a + lie -1;
write_com(a);
write_date(p);
}
void init() //1602初始化
{
write_com(0x38);
write_com(0x0e);
write_com(0x06);
write_com(0x01);
write_com(0x80);
}
void xianshi1() //pm2.5顯示
{
L1602_string(1,1,'P');
L1602_string(1,2,'M');
L1602_string(1,3,'2');
L1602_string(1,4,'.');
L1602_string(1,5,'5');
L1602_string(1,6,':');
L1602_string(1,7,' ');
L1602_string(1,8,K/100+0x30);
L1602_string(1,9,(K-100*(K/100))/10+0x30);
L1602_string(1,10,K%10+0x30);
L1602_string(1,11,' ');
L1602_string(1,12,'u');
L1602_string(1,13,'g');
L1602_string(1,14,'/');
L1602_string(1,15,'m');
L1602_string(1,16,'3');
L1602_string(2,1,'T');
L1602_string(2,2,'e');
L1602_string(2,3,'m');
L1602_string(2,4,'p');
L1602_string(2,5,':');
L1602_string(2,6,digit[tempshi]);
L1602_string(2,7,digit[tempge]);
L1602_string(2,8,'C');
L1602_string(2,9,' ');
L1602_string(2,10,'H');
L1602_string(2,11,'u');
L1602_string(2,12,'m');
L1602_string(2,13,':');
L1602_string(2,14,digit[humshi]);
//L1602_string(2,14,(K-100*(K/100))/10+0x30);
L1602_string(2,15,digit[humge]);
//L1602_string(2,15,K%10+0x30);
L1602_string(2,16,'%');
}
void readDH() //溫濕度讀取
{
dht_start();
recieve_data();
dht_take_sample();
humshi=humidity_interger/10;
humge=humidity_interger%10;
tempshi=temperature_integer/10;
tempge=temperature_integer%10;
}
void Timer0Init()
{
RW=0;
LED=0;
TMOD|=0X01;//選擇為定時(shí)器0模式，工作方式1，僅用TR0打開(kāi)啟動(dòng)。
TH0=(65536-10000)%256;
TL0=(65536-10000)/256; //定時(shí)10ms
ET0=1;//打開(kāi)定時(shí)器0中斷允許
EA=1;//打開(kāi)總中斷
TR0=1;//打開(kāi)定時(shí)器
}
void main() //主函數(shù)
{
int liu=0;
LCDE=0;
init();
Timer0Init();
while(1)
{
//liu++;
// if(liu==245)
//liu=0;
// K=Adc0832();
readDH();
xianshi1();
}
}
/**************************************
/*****定時(shí)器0中斷服務(wù)程序****/
void Timer0() interrupt 1
{
static u16 j;
// temp++;
TH0 = (65536-10000)%256;
TL0 = (65536-10000)/256;
LED=1;
//開(kāi)啟傳感器的ＬＥＤ
for (j=0;j<222;j++); //0.28ms //延時(shí)0.28ms
K=Adc0832(); //開(kāi)啟ADC采集
/* if(temp==20){
K+=40;
temp=0;
} */
//if(K>240)
//K=0;
//xianshi1();
TR0 = 0; //先關(guān)閉定時(shí)器0
EA = 0;
LED=0;
}

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