Greenhouse heater

#include <DHT22.h>
// Only used for sprintf
#include <stdio.h>

// Data wire is plugged into port 7 on the Arduino
// Connect a 4.7K resistor between VCC and the data pin (strong pullup)
#define DHT22_PIN 12    //blue/white

// Setup a DHT22 instance
DHT22 myDHT22(DHT22_PIN);

//set variables
//int tempF
int HeaterPin = 8;    // Heater Transistor is connected to Pin 2    orange/white
int FanPin = 7;     // Fan Transistor connected to Pin 3            green/white

float temperature;
float humidity;

// For creating light averages
float readingsT[10];
int iT = 0;
int readingsTcount = 0;
float avgT;
int readingsTtotalcount; //

//heating logic
int heatingup = 0;

//fan logic
int fanup = 0; //0=off 1 =on
int timer; //counter
int cycle; //0=off 1 =on

void setup(void)
{
  // start serial port
  Serial.begin(9600);
  Serial.println("DHT22 Library Demo");

  //analogWrite(HeaterPin,200); // Turn on Heater
  //analogWrite(FanPin,200); // Turn on Fan
}

void loop(void)
{


  DHT22_ERROR_t errorCode;

  // The sensor can only be read from every 1-2s, and requires a minimum
  // 2s warm-up after power-on.
  delay(2000);

  Serial.print("Requesting data...");
  errorCode = myDHT22.readData();
  switch(errorCode)
  {
    case DHT_ERROR_NONE:
      Serial.print("Got Data ");
      Serial.print(myDHT22.getTemperatureC());
      Serial.print("C ");
      Serial.print(myDHT22.getHumidity());
      Serial.println("%");
      // Alternately, with integer formatting which is clumsier but more compact to store and
	  // can be compared reliably for equality:
	  //
      char buf[128];
      sprintf(buf, "Integer-only reading: Temperature %hi.%01hi C, Humidity %i.%01i %% RH",
                   myDHT22.getTemperatureCInt()/10, abs(myDHT22.getTemperatureCInt()%10),
                   myDHT22.getHumidityInt()/10, myDHT22.getHumidityInt()%10);
      //Serial.println(buf);



      //Begin Greenhouse Code -----------------------------------------------------------------------

      temperature = myDHT22.getTemperatureCInt()/10 + (myDHT22.getTemperatureCInt()%10 * .1);
      //Serial.println(avgT); //print

      //Calculate Temp average (using light averages)
readingsT[readingsTcount] = temperature;
readingsTcount++;
readingsTtotalcount++;
if (readingsTcount == 10) { readingsTcount = 0; }

if (readingsTtotalcount > 9) {
    avgT = (readingsT[0] + readingsT[1] + readingsT[2] + readingsT[3] + readingsT[4] + readingsT[5] + readingsT[6] + readingsT[7] + readingsT[8] + readingsT[9])/10;
  } else {
    avgT = 5555;
}


   if (avgT < 20) { //if temperature is below 20c start the heating up cycle
       heatingup = 1; // Turn on Heater
   }

   if(avgT < 24.5 && heatingup == 1) { //if temperature is below 24 and we're in a heating up cycle, keep the heater on
       heatingup = 1; // Turn on Heater
   }

   if(avgT > 24.5) { //if temperature is above 24 turn off the heating up cycle
       heatingup = 0; // Turn off Heater
   }


 if (heatingup == 1) {
     analogWrite(HeaterPin,255); // Turn on Heater
   } else if (heatingup == 0) {
     analogWrite(HeaterPin,0); // Turn off Heater
 }



 // fan logic ----------------------

 // if humidity is above 60 - fan on 30 min rest 30 min
 // if humidity is below 60 - pulse it 10 min rest 50 min
 // end fan logic ----------------------

      humidity = myDHT22.getHumidityInt()/10 + (myDHT22.getHumidityInt()%10 * .1);

 timer = timer + 2; //add 2 seconds to timer

 if (humidity > 100000) {
   if (timer > 1800) {  //if timer is above 1800seconds or 30 minutes, turn off fan and reset timer
     if (cycle == 0) { cycle = 1; } else { cycle = 0; } //change the cycle
     timer = 0;  //reset the timer
   }
   //if (timer < 1800) { //if timer is < time
     if (cycle == 1) { fanup = 1; } else { fanup = 0; } //if cycle is on, turn fan on, if cycle is off, turn fan off
   //}
 }

if (humidity <= 20) { //if humidity <= 60
    if (timer > 10) { cycle = 1; }
    if (timer > 16) { cycle = 0; timer = 0; }
 }

 if (humidity > 40) { // if humidity > 60
    if (timer > 10) { cycle = 1; }
    if (timer > 20) { cycle = 0; timer = 0; }
 }

 if (cycle == 1) { fanup = 1; } else { fanup = 0; } //if cycle is on, turn fan on, if cycle is off, turn fan off

 if (fanup == 1) {
    analogWrite(FanPin,255); // Turn on Fan
  } else if (fanup == 0) {
    analogWrite(FanPin,0); // Turn off Fan
 }



 //Print for Debug
 digitalWrite(led, HIGH);
 // Serial.print(Lightreading); Serial.println(" Light");
  Serial.print(temperature); Serial.println(" Current Temp");
  Serial.print(avgT); Serial.println(" Average Temp");
  Serial.print(readingsTcount); Serial.println(" Integer");
  Serial.print(heatingup); Serial.println(" Heater Pin");
  Serial.println(" ");




      //End Greenhouse Code -----------------------------------------------------------------------

      break;
    case DHT_ERROR_CHECKSUM:
      Serial.print("check sum error ");
      Serial.print(myDHT22.getTemperatureC());
      Serial.print("C ");
      Serial.print(myDHT22.getHumidity());
      Serial.println("%");
      break;
    case DHT_BUS_HUNG:
      Serial.println("BUS Hung ");
      break;
    case DHT_ERROR_NOT_PRESENT:
      Serial.println("Not Present ");
      break;
    case DHT_ERROR_ACK_TOO_LONG:
      Serial.println("ACK time out ");
      break;
    case DHT_ERROR_SYNC_TIMEOUT:
      Serial.println("Sync Timeout ");
      break;
    case DHT_ERROR_DATA_TIMEOUT:
      Serial.println("Data Timeout ");
      break;
    case DHT_ERROR_TOOQUICK:
      Serial.println("Polled to quick ");
      break;
  }





}