DHT 온도 습도 센서 측정하기 (아두이노 ide)

 

필요 물품

아두이노 우노 보드 회로 DHT 온도 습도 센서 USB 케이블 PC 브레드보드 아두이노 IDE

 

 

아두이노 우노 보드와 센서를 회로로 연결하여 측정하였다 

https://blog.naver.com/roboholic84/221186233842

예제 코드

//

//    FILE: dht.h

//  AUTHOR: Rob Tillaart

// VERSION: 0.1.18

// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino

//     URL: http://arduino.cc/playground/Main/DHTLib

//

// HISTORY:

// see dht.cpp file

//

#ifndef dht_h

#define dht_h

#if ARDUINO < 100

#include <WProgram.h>

#include <pins_arduino.h>  // fix for broken pre 1.0 version - TODO TEST

#else

#include <Arduino.h>

#endif

#define DHT_LIB_VERSION "0.1.18"

#define DHTLIB_OK                   0

#define DHTLIB_ERROR_CHECKSUM       -1

#define DHTLIB_ERROR_TIMEOUT        -2

#define DHTLIB_ERROR_CONNECT        -3

#define DHTLIB_ERROR_ACK_L          -4

#define DHTLIB_ERROR_ACK_H          -5

#define DHTLIB_DHT11_WAKEUP         18

#define DHTLIB_DHT_WAKEUP           1

#define DHTLIB_DHT11_LEADING_ZEROS  1

#define DHTLIB_DHT_LEADING_ZEROS    6

// max timeout is 100 usec.

// For a 16 Mhz proc 100 usec is 1600 clock cycles

// loops using DHTLIB_TIMEOUT use at least 4 clock cycli

// so 100 us takes max 400 loops

// so by dividing F_CPU by 40000 we "fail" as fast as possible

#define DHTLIB_TIMEOUT 400 // (F_CPU/40000)

class dht

{

public:

    // return values:

    // DHTLIB_OK

    // DHTLIB_ERROR_CHECKSUM

    // DHTLIB_ERROR_TIMEOUT

    // DHTLIB_ERROR_CONNECT

    // DHTLIB_ERROR_ACK_L

    // DHTLIB_ERROR_ACK_H

    int read11(uint8_t pin);

    int read(uint8_t pin);

    inline int read21(uint8_t pin) { return read(pin); };

    inline int read22(uint8_t pin) { return read(pin); };

    inline int read33(uint8_t pin) { return read(pin); };

    inline int read44(uint8_t pin) { return read(pin); };

    double humidity;

    double temperature;

private:

    uint8_t bits[5];  // buffer to receive data

    int _readSensor(uint8_t pin, uint8_t wakeupDelay, uint8_t leadingZeroBits);

};

#endif

//

// END OF FILE

//