Maker物聯網實作：用DHx溫濕度感測模組回傳天氣溫溼度

▲  Dallas DS18B20 溫度感測器

▲ DHT11溫濕度感測器

DHT11溫濕度感測模組 

Arduino開發板接腳

解說

Data

Arduino digital Input pin 2

DHT11資料輸出腳位

5V

Arduino pin 5V

5V 陽極接點

GND

Arduino pin Gnd

共地接點

/*

  Board                    int.0           int.1   int.2   int.3   int.4   int.5

 Uno, Ethernet              2        3

 Mega2560       2 ZX              3        21      20      19      18

 Leonardo         3        2        0        1

 Due              (any pin, more info http://arduino.cc/en/Reference/AttachInterrupt)

 This example, as difference to the other, make use of the new method acquireAndWait()

 */

// use digital pin 2 to connect DHT-11 data pin

#include <idDHT11.h>

int idDHT11pin = 2; //Digital pin for comunications

int idDHT11intNumber = 0; //interrupt number (must be the one that use the previus defined pin (see table above)

//declaration

void dht11_wrapper(); // must be declared before the lib initialization

// Lib instantiate

idDHT11 DHT11(idDHT11pin,idDHT11intNumber,dht11_wrapper);

void setup()

{

  Serial.begin(9600);

  Serial.println("idDHT11 Example program");

  Serial.print("LIB version: ");

  Serial.println(IDDHT11LIB_VERSION);

  Serial.println("---------------");

}

// This wrapper is in charge of calling

// mus be defined like this for the lib work

void dht11_wrapper() {

  DHT11.isrCallback();

}

void loop()

{

  Serial.print("\nRetrieving information from sensor: ");

  Serial.print("Read sensor: ");

  //delay(100);

  int result = DHT11.acquireAndWait();

  switch (result)

  {

  case IDDHTLIB_OK:

    Serial.println("OK");

    break;

  case IDDHTLIB_ERROR_CHECKSUM:

    Serial.println("Error\n\r\tChecksum error");

    break;

  case IDDHTLIB_ERROR_TIMEOUT:

    Serial.println("Error\n\r\tTime out error");

    break;

  case IDDHTLIB_ERROR_ACQUIRING:

    Serial.println("Error\n\r\tAcquiring");

    break;

  case IDDHTLIB_ERROR_DELTA:

    Serial.println("Error\n\r\tDelta time to small");

    break;

  case IDDHTLIB_ERROR_NOTSTARTED:

    Serial.println("Error\n\r\tNot started");

    break;

  default:

    Serial.println("Unknown error");

    break;

  }

  Serial.print("Humidity (%): ");

  Serial.println(DHT11.getHumidity(), 2);

  Serial.print("Temperature (oC): ");

  Serial.println(DHT11.getCelsius(), 2);

  Serial.print("Temperature (oF): ");

  Serial.println(DHT11.getFahrenheit(), 2);

  Serial.print("Temperature (K): ");

  Serial.println(DHT11.getKelvin(), 2);

  Serial.print("Dew Point (oC): ");

  Serial.println(DHT11.getDewPoint());

  Serial.print("Dew Point Slow (oC): ");

  Serial.println(DHT11.getDewPointSlow());

  delay(2000);

}

DHT22溫濕度感測模組 

Arduino開發板接腳

解說

DAT

Arduino digital Input pin 2

DHT22資料輸出腳位

5V

Arduino pin 5V

5V 陽極接點

GND

Arduino pin Gnd

共地接點

// Example testing sketch for various DHT humidity/temperature sensors

// Written by ladyada, public domain

#include "DHT.h"

#define DHTPIN 2 // what pin we're connected to

// Uncomment whatever type you're using!

//#define DHTTYPE DHT11 // DHT 11

#define DHTTYPE DHT22 // DHT 22 (AM2302)

//#define DHTTYPE DHT21 // DHT 21 (AM2301)

// Connect pin 1 (on the left) of the sensor to +5V

// Connect pin 2 of the sensor to whatever your DHTPIN is

// Connect pin 4 (on the right) of the sensor to GROUND

// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

DHT dht(DHTPIN, DHTTYPE);

void setup()

{

    Serial.begin(9600);

    Serial.println("DHTxx test!");

    dht.begin();

}

void loop()

{

    // Reading temperature or humidity takes about 250 milliseconds!

    // Sensor readings may also be up to A0 seconds 'old' (its a very slow sensor)

    float h = dht.readHumidity();

    float t = dht.readTemperature();

    // check if returns are valid, if they are NaN (not a number) then something went wrong!

    if (isnan(t) || isnan(h))

    {

        Serial.println("Failed to read from DHT");

    }

    else

    {

        Serial.print("Humidity: ");

        Serial.print(h);

        Serial.print(" %\t");

        Serial.print("Temperature: ");

        Serial.print(t);

        Serial.println(" *C");

    }

}