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I'm facing a strange problem: I'm using a D18B20 plus a DHT11 with my Spark Core, sending data to my local EmonCMS. Everything works fine...but I can't figure out how to show at least one decimal point for values coming from DHT22, while temperature from D18B20 is correctly formatted.

I don't understand if the problem comes from my sketch on Spark Core, from MySQL database or  from some hidden options in EmonCMS.

Anyone can help me? i've been struggling around for a week...

My code:

// This #include statement was automatically added by the Particle IDE.
#include "PietteTech_DHT/PietteTech_DHT.h"

// This #include statement was automatically added by the Particle IDE.
#include "spark-dallas-temperature/spark-dallas-temperature.h"

// This #include statement was automatically added by the Particle IDE.
#include "OneWire/OneWire.h"

#include "application.h"
#include "HttpClient/HttpClient.h"

#define DHTTYPE  DHT11              // Sensor type DHT11/21/22/AM2301/AM2302
#define DHTPIN   D3               // Digital pin for communications
#define DHT_SAMPLE_INTERVAL   2000  // Sample every two seconds
//declaration
void dht_wrapper(); // must be declared before the lib initialization

// Lib instantiate
PietteTech_DHT DHT(DHTPIN, DHTTYPE, dht_wrapper);

/**
  Declaring the variables.
*/
#define TOKEN "7327a3859afda46ba2eb1d326b7b1d1e1251922f"
#define ONE_WIRE_BUS D2
double temperature = 0.0;
int light = 0;
float h = 0.0;
float t = 0.0;

bool bDHTstarted;        // flag to indicate we started acquisition

unsigned int nextTime = 0;    // Next time to contact the server

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensor(&oneWire);
HttpClient http;

// Headers currently need to be set at init, useful for API keys etc.
http_header_t headers[] = {
  { "Content-Type", "application/json" },
  { "X-Auth-Token" , TOKEN },
  { "Accept" , "*/*"},
  { NULL, NULL } // NOTE: Always terminate headers will NULL
};

http_request_t request;
http_response_t response;

void setup() {
  Spark.variable("temp", &temperature, DOUBLE);
  Spark.variable("light", &light, INT);
  //Spark.variable("humidity", &h, DOUBLE);

  sensor.begin();
  sensor.setResolution(12);
  //dht.begin();
  Serial.begin(9600);
}

void dht_wrapper() {
  DHT.isrCallback();
}

void loop() {
  if (nextTime < millis()) {

    if (!bDHTstarted) {   // start the sample
      Serial.println("Retrieving information from sensor: ");
      DHT.acquire();
      bDHTstarted = true;
    }
    if (!DHT.acquiring()) {   // has sample completed?
      // get DHT status
      int result = DHT.getStatus();

      Serial.print("Read sensor: ");
      switch (result) {
        case DHTLIB_OK:
          Serial.println("OK");
          break;
        case DHTLIB_ERROR_CHECKSUM:
          Serial.println("Error\n\r\tChecksum error");
          break;
        case DHTLIB_ERROR_ISR_TIMEOUT:
          Serial.println("Error\n\r\tISR time out error");
          break;
        case DHTLIB_ERROR_RESPONSE_TIMEOUT:
          Serial.println("Error\n\r\tResponse time out error");
          break;
        case DHTLIB_ERROR_DATA_TIMEOUT:
          Serial.println("Error\n\r\tData time out error");
          break;
        case DHTLIB_ERROR_ACQUIRING:
          Serial.println("Error\n\r\tAcquiring");
          break;
        case DHTLIB_ERROR_DELTA:
          Serial.println("Error\n\r\tDelta time to small");
          break;
        case DHTLIB_ERROR_NOTSTARTED:
          Serial.println("Error\n\r\tNot started");
          break;
        default:
          Serial.println("Unknown error");
          break;
      }
      Serial.print("Humidity (%): ");
      h = DHT.getHumidity();
      Serial.println(h, 2);

      Serial.print("Temperature (oC): ");
      t = DHT.getCelsius();
      Serial.println(t, 2);

      Serial.print("Temperature (oF): ");
      Serial.println(DHT.getFahrenheit(), 2);

      Serial.print("Temperature (K): ");
      Serial.println(DHT.getKelvin(), 2);

      Serial.print("Dew Point (oC): ");
      Serial.println(DHT.getDewPoint());

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

      bDHTstarted = false;  // reset the sample flag so we can take another
      /////}

      sensor.requestTemperatures();
      temperature = sensor.getTempCByIndex(0);
      light = analogRead(A0);

      request.hostname = "xxxxxxxxxxxx.noip.me";
      request.port = 80;
      request.path = "/emoncms/input/post.json?apikey=04ee49a2498f7eb7b1aab7a54a27257a&node=1&json={temp:" + String(temperature) + ",tempDHT11:" + String(t)  + ",light:" + String(light) + ",humidity:" + String(h) + "}";

      http.post(request, response, headers);

      nextTime = millis() + 30000;
    }
  }
}