gistfile1.cpp

// This #include statement was automatically added by the Spark IDE.
#include "idDHT22/idDHT22.h"
 
#define DHTPIN D4    // Digital pin D2
#define WORKING_LED D7

void dht22_wrapper(); // must be declared before the lib initialization

// DHT instantiate
idDHT22 DHT22(DHTPIN, dht22_wrapper);

// This wrapper is in charge of calling
// mus be defined like this for the lib work
void dht22_wrapper() {
	DHT22.isrCallback();
}

float h;    // humidity
float t;    // temperature
double tempC = 0;
double humidity = 0;
int f = 0;  // failed?
 
void setup() {
    Serial.begin(9600);
        
    // dim the main LED
    RGB.control(true);
    RGB.brightness(32);
    RGB.control(false);
    
    // Turn on control of status LEDs
    pinMode(WORKING_LED, OUTPUT);
    
    // Flash the working LED to show we are running start
    for(int i=0; i<5; i++) {
        digitalWrite(WORKING_LED, HIGH);
        delay(75);
        digitalWrite(WORKING_LED, LOW);
        delay(75);
    }
    
    Spark.variable("tempC", &tempC, DOUBLE);
    Spark.variable("humidity", &humidity, DOUBLE);
}
 
bool readDHT22()
{
	Serial.print("Retrieving information from DHT22 sensor: ");

	DHT22.acquire();
	while (DHT22.acquiring())
		;
	int result = DHT22.getStatus();
	switch (result)
	{
		case IDDHTLIB_OK:
			Serial.println("OK");
			return true;
		case IDDHTLIB_ERROR_CHECKSUM:
			Serial.println("Checksum error");
			break;
		case IDDHTLIB_ERROR_ISR_TIMEOUT:
			Serial.println("ISR Time out error");
			break;
		case IDDHTLIB_ERROR_RESPONSE_TIMEOUT:
			Serial.println("Response time out error");
			break;
		case IDDHTLIB_ERROR_DATA_TIMEOUT:
			Serial.println("Data time out error");
			break;
		case IDDHTLIB_ERROR_ACQUIRING:
			Serial.println("Error Acquiring");
			break;
		case IDDHTLIB_ERROR_DELTA:
			Serial.println("Error Delta time to small");
			break;
		case IDDHTLIB_ERROR_NOTSTARTED:
			Serial.println("Error Not started");
			break;
		default:
			Serial.println("Unknown Error");
			break;
	}
	return false;
}


void loop() {
    Serial.println("START");
    digitalWrite(WORKING_LED, LOW);
    
    
    if (readDHT22())
    {
        h = DHT22.getHumidity();
        t = DHT22.getCelsius();
        f = 0;
    } 
    else 
    {
        t = h = 999;
        f = 1;
    }

    
    if (!f) 
        //Update the temp
        Serial.print("  tempC: ");
        Serial.println(t);
        tempC = (double)t;
        
        //Update the humidity
        Serial.print("  humidity: ");
        Serial.println(h);
        humidity = (double)h;
        
        digitalWrite(WORKING_LED, HIGH);
    
    delay(6000);
    Serial.println("END");
}