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Pioneer600_code/Sensor/Temperature-Humidity_Sensor/DHT11.c

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+#include <stdio.h>
+#include<wiringPi.h>
+
+#define Data 26
+
+char DHT11_Read(char *temperature,char *humidity)	   
+{                 
+	unsigned char t,i,j;
+	unsigned char buf[5]={0,0,0,0,0};
+	pinMode(Data,OUTPUT); 	    //SET OUTPUT
+	pullUpDnControl(Data,PUD_UP);
+    digitalWrite(Data,0); 	    //Data=0
+    delay(20);         	        //Pull down Least 18ms
+    digitalWrite(Data,1); 	    //Data =1
+	delayMicroseconds(30);     	//Pull up 20~40us
+	pinMode(Data,INPUT);        //SET INPUT
+	
+    while (digitalRead(Data) && t <100)//DHT11 Pull down 80us
+	{
+		t++;
+		delayMicroseconds(1);
+	};	 
+	if(t >= 100)return 1;
+	t = 0;
+    while (!digitalRead(Data) && t<100)//DHT11 Pull up 80us
+	{
+		t++;
+		delayMicroseconds(1);
+	};
+	if(t >= 100)return 1;	    
+	for(i=0;i < 5;i++)
+	{
+		buf[i] = 0;
+		for(j=0;j<8;j++)
+		{
+			buf[i] <<= 1;
+			t = 0;
+			while(digitalRead(Data) && t < 100)
+			{
+				t++;
+				delayMicroseconds(1);
+			}
+			if(t >= 100) return 1;
+			t = 0;
+			while(!digitalRead(Data) && t <100)
+			{
+				t++;
+				delayMicroseconds(1);
+			}
+			if(t >= 100) return 1;
+			delayMicroseconds(40);
+			if(digitalRead(Data))
+				buf[i] += 1;
+		}
+	}
+	if(buf[0]+buf[1]+buf[2]+buf[3]!=buf[4])return 2;
+	*humidity = buf[0];
+	*temperature =buf[2];
+	return 0;
+} 
+
+
+int main(void)
+{
+	char temperature;  	    
+	char humidity; 
+	char value;
+
+	if (wiringPiSetup() < 0)return 1;
+	printf("Waveshare!\r\n");
+	
+  	while(1)
+	{
+		value = DHT11_Read(&temperature,&humidity);	
+		if(value == 0)
+		{ 
+			printf("\ntemperature = %d\r\n",temperature);
+			printf("humidity    = %d\r\n",humidity);
+		}
+		else if (value == 2)
+		 	printf("\ncheck sum err\n");
+		else
+			printf("\ntime out\n");
+ 		delay(1000);
+	}
+}
+