Temperature Sensor Fan Project

int _version = 1;

#include <math.h>
#include "application.h"


#define THERMISTORNOMINAL 3000

#define TEMPERATURENOMINAL 21.11

#define NUMSAMPLES 5

#define BCOEFFICIENT 3950

#define SERIESRESISTOR 10000


#define READ_INTERVAL 5000
bool COLDROOM= false;
bool HOTROOM = false;

unsigned long interval = 0;
int samples[NUMSAMPLES];
int THERMISTOR = A0;

char temperature_str[64]; //String to store the sensor data
char temperature_ifttt[64];


bool useFahrenheit = true;

void setup() {

    Particle.publish("device starting", "Version: " + String(_version), 60, PRIVATE);

    interval = 0;
    Particle.function("status", status);
    pinMode(THERMISTOR, INPUT);
    
    Particle.variable("tmp", temperature_str, STRING);

}

void loop() {
   
    if( (millis() - interval >= READ_INTERVAL) or (interval==0) ) {
        temp();
        interval = millis();
    }
}


int status(String args)
{
 
 Particle.publish("temp", temperature_ifttt, 60, PRIVATE);
 return 0;
}


int temp()
{
    uint8_t i;
    float average;

   
    for (i=0; i< NUMSAMPLES; i++) {
        samples[i] = analogRead(THERMISTOR);
        delay(10);
    }

    
    average = 0;
    for (i=0; i< NUMSAMPLES; i++) {
        average += samples[i];
    }
    average /= NUMSAMPLES;

    
    average = (4095 / average)  - 1;
    average = SERIESRESISTOR / average;


    float steinhart;
    steinhart = average / THERMISTORNOMINAL;     // (R/Ro)
    steinhart = log(steinhart);                  // ln(R/Ro)
    steinhart /= BCOEFFICIENT;                   // 1/B * ln(R/Ro)
    steinhart += 1.0 / (TEMPERATURENOMINAL + 273.15); // + (1/To)
    steinhart = 1.0 / steinhart;                 // Invert
    steinhart -= 273.15;                         // convert to C


  
  
   





 if (useFahrenheit) {
    steinhart = (steinhart * 9.0)/ 5.0 + 32.0;
  }
 

    char ascii[32];
    int steinhart1 = (steinhart - (int)steinhart) * 100;

    
    steinhart1 = abs(steinhart1);

    sprintf(ascii,"%0d.%d", (int)steinhart, steinhart1);
    Particle.publish("Room_Temperature", ascii, 60, PRIVATE);

    char tempInChar[32];
    sprintf(tempInChar,"%0d.%d", (int)steinhart, steinhart1);

   
    sprintf(temperature_str, "{\"t\":%s}", tempInChar);

   
    sprintf(temperature_ifttt, "%s", tempInChar);
    
    
     if( steinhart > 78 ) {
      // if condition is true then print the following
       Particle.publish("HOTROOM", "True");
   } else {
      // if condition is false then print the following
       Particle.publish("COLDROOM", "True");
   }
  
     return 0;
}