DHT11傳感器STC12單片機程序

1、DHT11傳感器STC12單片機程序#in clude#in clude#in cludesbit DHT = P0A0;/管腳定義，DHT11 總線輸入輸出；uchar data_byte;uchar Tem_Z,Tem_X,Hum_Z,Hum_X,Check;void LCD_Display();/聲明LCD_Display液晶顯示函數(shù)；void Rec_DHT();聲明Rec_DHT,DHT11接收數(shù)據(jù)函數(shù)；void receive。；主函數(shù)void mai n()lcd_in it();while(1)Rec_DHT();LCD_Display();delayms(1000);延時函數(shù)

2、,/延時msvoid delays()/12.000MHz uchar i, j, k;i = 1;j = 234;k = 113;dodowhile (-k); while (-j); while (-i);延時iusvoid delay10us()uchar i;for(i=0;i6;i+)_nop_()；_nop_()；_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();/*主機發(fā)出開始信號*/void DHT11_Start()DHT=1;delay10us();DHT=0;delays();保持電平時間大于18ms,延時20msDHT=1;

3、delay10us();/延遲等待 20-40us,延時20usdelay10us();delay10us();delay10us();DHT=1;/拉高等待DHT11響應(yīng)/DHT11接收一個字節(jié)數(shù)據(jù)uchar receive_data()uchar i,temp,co unt;data_byte=O;for(i=0;i8;i+)coun t=2;while(!DHT)&cou nt+);/ 等待50us低電平結(jié)束delay10us();/ 等待40us咼電平，后判斷電平咼低低:DHT為0delay10us();delay10us();delay10us();temp=0;if(DHT=1)/

4、DHT為高:1,位為1coun t=2;while(DHT)&cou nt+);待DHT高電平結(jié)束if(co un t=1)break;為低:0,位為0data_byte35)write(注意防署);else if(Tem_Z70)write(注意除濕);else if(Hum_Z0;i-)片機晶振頻率為12MHZ ;for(j=120;j0;j-);單片機12倍速度運行 /12864寫命令void write_com(uchar com) uchar i;/11111000寫指令 0uchar i_data; i_data=0xf8;cs=1;sclk=0;for(i=0;i8;i+)sid

5、=(bit)(i_data&0x80); sclk=0;sclk=1;i_data=i_data1;i_data=com; i_data&=OxfO; for(i=0;i8;i+)sid=(bit)(i_data&0x80); sclk=O;sclk=1;i_data=i_data1; i_data=com; i_data=i_data4; for(i=0;i8;i+)sid=(bit)(i_data&0x80); sclk=0;sclk=1;i_data=i_data1;cs=0;delayms(10);/12864寫數(shù)據(jù)void write_data(uchar date)uchar i;

6、uchar i_data;i_data=Oxfa;/ 寫數(shù)據(jù)cs=1;for(i=0;i8;i+)sid=(bit)(i_data&0x80); sclk=0;sclk=1; i_data=i_data1;i_data=date;i_data&=0xf0;for(i=0;i8;i+)sid=(bit)(i_data&0x80); sclk=0;sclk=1;i_data=i_data1;i_data=date;i_data=i_data4;for(i=0;i8;i+)sid=(bit)(i_data&0x80);sclk=O;sclk=1;i_data=i_data1;cs=0;delayms

7、(IO);lcd12864初始化void lcd_i nit()psb=0;液晶屏為串行數(shù)據(jù)傳輸模式rst=0;復位delayms(2);rst=1;delayms(2);write_com(0x30);II基本指令,擴充指令為34Hdelayms(4); write_com(0x02); delayms(4); write_com(OxOc); delayms(4); write_com(0x01); delayms(4);II清除 ddramII顯示開，關(guān)光標II清屏設(shè)定顯示位置，x、y為12864軸坐標，x:1-4 ; y:1-16;void lcd_pos(uchar x,uchar y)uchar pos;if(x=1)x=0x80;IIx 為第幾行1-4；else if(x=2)x=0x90;else if(x=3)x=0x88;else if(x=4)x=0x98;pos=x+y-1; write_com(pos);指定位置顯示任意文字、字符void write(uchar * str)uchar i =