请生成一个树莓派控制空气温湿度传感器DHT11的C语言代码

这里是一个简单的树莓派控制DHT11温湿度传感器的C语言代码，需要使用wiringPi库来控制GPIO引脚。你需要将DHT11的数据引脚连接到树莓派GPIO引脚上。

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <wiringPi.h>

#define MAX_TIMINGS 85
#define DHT_PIN     7    // GPIO 4

int data[5] = { 0, 0, 0, 0, 0 };

void readDHT11() {
    uint8_t laststate = HIGH;
    uint8_t counter = 0;
    uint8_t j = 0, i;
    data[0] = data[1] = data[2] = data[3] = data[4] = 0;

    pinMode(DHT_PIN, OUTPUT);
    digitalWrite(DHT_PIN, LOW);
    delay(20);
    digitalWrite(DHT_PIN, HIGH);
    delayMicroseconds(40);
    pinMode(DHT_PIN, INPUT);

    for (i = 0; i < MAX_TIMINGS; i++) {
        counter = 0;
        while (digitalRead(DHT_PIN) == laststate) {
            counter++;
            delayMicroseconds(1);
            if (counter == 255)
                break;
        }
        laststate = digitalRead(DHT_PIN);
        if (counter == 255)
            break;
        if ((i >= 4) && (i % 2 == 0)) {
            data[j / 8] <<= 1;
            if (counter > 50)
                data[j / 8] |= 1;
            j++;
        }
    }

    if ((j >= 40) && (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF))) {
        printf("Humidity = %d.%d %% Temperature = %d.%d *C\n", data[0], data[1], data[2], data[3]);
    }
    else {
        printf("Data not good, skip\n");
    }
}

int main() {
    if (wiringPiSetup() == -1)
        exit(EXIT_FAILURE);

    while (1) {
        readDHT11();
        delay(2000);
    }

    return 0;
}

这个代码会不断循环读取DHT11传感器的数值，并将湿度和温度打印到控制台上。你可以根据自己的需求修改代码，比如将数据传输到其他设备或者加入报警机制等。