树莓派3b驱动dht11温湿度传感器

树莓派3b驱动dht11温湿度传感器

1.新建并打开C文件

touch dht11.csudo vim dht11.c

2.编写驱动程序

 #include
#include
#include
#include
#define MAX_TIME 85
#define DHT11PIN 7
#define ATTEMPTS 5                 //retry 5 times when no response
int dht11_val[5]={0,0,0,0,0};int dht11_read_val(){uint8_t lststate=HIGH;         //last stateuint8_t counter=0;uint8_t j=0,i;for(i=0;i<5;i++)dht11_val[i]=0;//host send start signal    pinMode(DHT11PIN,OUTPUT);      //set pin to output digitalWrite(DHT11PIN,LOW);    //set to low at least 18ms delay(18);digitalWrite(DHT11PIN,HIGH);   //set to high 20-40usdelayMicroseconds(40);//start recieve dht responsepinMode(DHT11PIN,INPUT);       //set pin to inputfor(i=0;i=4)&&(i%2==0)){dht11_val[j/8]<<=1;     //write 1 bit to 0 by moving left (auto add 0)if(counter>16)      //long mean 1dht11_val[j/8]|=1;     //write 1 bit to 1 j++;}}// verify checksum and print the verified dataif((j>=40)&&(dht11_val[4]==((dht11_val[0]+dht11_val[1]+dht11_val[2]+dht11_val[3])& 0xFF))){printf("RH:%d,TEMP:%d\n",dht11_val[0],dht11_val[2]);return 1;}elsereturn 0;
}int main(void){int attempts=ATTEMPTS;if(wiringPiSetup()==-1)exit(1);while(attempts){                        //you have 5 times to retryint success = dht11_read_val();     //get result including printing outif (success) {                      //if get result, quit program; if not, retry 5 times then quitbreak;}attempts--;delay(2500);  }return 0;
}

按esc，然后输入:wq保存退出。 

3.编译c文件

需安装wiringPi开发库，安装教程详见本博主博客：树莓派安装wiringPi开发库

输入命令：

gcc -Wall -o dht11 dht11.c -lwiringPi

gcc是编译器，-Wall是在编译时显示警告信息，-o dht11.c是将dht11.c文件编译成文件名为dht11的可执行文件，-lwiringPi是将wiringPi头文件包含在可执行文件中。

4.运行程序

输入命令：

sudo ./dht11

可以看到湿度和温度值都正确的打印在了屏幕上。

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