树莓派dht11代码qt驱动代码

以下是使用Qt编写的DHT11传感器驱动代码，可以通过调用该驱动代码，获取DHT11传感器的温湿度数据：

DHT11.h文件

#ifndef DHT11_H
#define DHT11_H

#include <QObject>
#include <wiringPi.h>

class DHT11 : public QObject
{
    Q_OBJECT
public:
    explicit DHT11(QObject *parent = nullptr);

public slots:
    void readData();

signals:
    void humidityAndTemperature(double humidity, double temperature);

private:
    int dht11_val[5]={0,0,0,0,0};
};

#endif // DHT11_H

DHT11.cpp文件

#include "DHT11.h"
#include <iostream>

using namespace std;

#define DHT11PIN 7

DHT11::DHT11(QObject *parent) : QObject(parent)
{
    if(wiringPiSetup()==-1)
        exit(1);
}

void DHT11::readData()
{
    unsigned char lststate=HIGH;
    unsigned char counter=0;
    unsigned char j=0,i;

    for(i=0;i<5;i++)
        dht11_val[i]=0;

    pinMode(DHT11PIN,OUTPUT);
    digitalWrite(DHT11PIN,LOW);
    delay(18);
    digitalWrite(DHT11PIN,HIGH);
    delayMicroseconds(40);
    pinMode(DHT11PIN,INPUT);

    for(i=0;i<85;i++)
    {
        counter=0;
        while(digitalRead(DHT11PIN)==lststate)
        {
            counter++;
            delayMicroseconds(1);
            if(counter==255)
                break;
        }

        lststate=digitalRead(DHT11PIN);

        if(counter==255)
            break;

        if((i>=4)&&(i%2==0))
        {
            dht11_val[j/8]<<=1;
            if(counter>16)
                dht11_val[j/8]|=1;
            j++;
        }
    }

    if((j>=40)&&(dht11_val[4]==((dht11_val[0]+dht11_val[1]+dht11_val[2]+dht11_val[3])& 0xff)))
    {
        double humidity = dht11_val[0] + dht11_val[1] * 0.1;
        double temperature = dht11_val[2] + dht11_val[3] * 0.1;
        emit humidityAndTemperature(humidity, temperature);
    }
    else
        cout << "Invalid Data!!" << endl;
}

在DHT11类中，实现了一个readData()函数，用于读取DHT11传感器的温湿度数据。在读取完数据后，通过信号humidityAndTemperature()，将温湿度数据发送出去。在主程序中，可以通过连接该信号，实现对温湿度数据的获取。