我看不懂使用RaspberryPi的温湿度传感器的源代码

import Adafruit_DHT

sensor = Adafruit_DHT.DHT11
pin = 4

humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)

if humidity is not None and temperature is not None:
    print('温度={0:0.1f}°C 湿度={1:0.1f}%'.format(temperature, humidity))
else:
    print('无法读取传感器数据')

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

#define MAX_TIMINGS 85
#define DHT_PIN 4

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

void read_dht_data()
{
    uint8_t last_state = 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(18);

    digitalWrite(DHT_PIN, HIGH);
    delayMicroseconds(40);

    pinMode(DHT_PIN, INPUT);

    for (i = 0; i < MAX_TIMINGS; i++)
    {
        counter = 0;
        while (digitalRead(DHT_PIN) == last_state)
        {
            counter++;
            delayMicroseconds(1);
            if (counter == 255)
            {
                break;
            }
        }
        last_state = digitalRead(DHT_PIN);

        if (counter == 255)
            break;

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

    if ((j >= 40) &&
        (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)))
    {
        float h = (float)((data[0] << 8) + data[1]) / 10;
        float c = (float)(((data[2] & 0x7F) << 8) + data[3]) / 10;
        if (data[2] & 0x80)
            c = -c;
        float f = c * 1.8f + 32;

        printf("温度=%.1f°C 湿度=%.1f%%\n", c, h);
    }
    else
    {
        printf("无法读取传感器数据\n");
    }
}

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

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

    return 0;
}