Project

Semester Project

Indoor Air Quality

Our Goal is to develope a system which can automatically manipulate indoor air quality by providing thermal comfort to user. The goal is to develop a system which will smart enough to manipulate the air control devices by sensing the temrature and humidity from the atmosphere. We have seen a massive scope of the product, it is also helping the user by reducing the electricity bill and indirectly it is helping to the earth by reducing the carbon foot print.

Project Presentation 1

First Mock-up Video

Project Presentation 2

After succeeding in a first mock up, we planned to take the project on a further level. We have planned to run some temprature manipulator device related to the Heat Index, So for that we chose DC operated fan as a temprature manipulator. And we coded in such a way that the fan will automativcally run at three different fan speed.If the temprature is below 25 Degree Celcious the fan will reun at it's minimum speed> If the temparature is above 30 Degree Celcious the fan speed would be Normal and if the temprature is above 40 Degree Celcious the fan will run at it's mmaximum speed.

Second Mock-up video

Code

#include <dht.h>
#include <dht_nonblocking.h>

//www.elegoo.com
//2018.10.25

#include <dht_nonblocking.h>
#define DHT_SENSOR_TYPE DHT_TYPE_11

static const int DHT_SENSOR_PIN = 2;
DHT_nonblocking dht_sensor( DHT_SENSOR_PIN, DHT_SENSOR_TYPE );

// These pins are for operation of DC fan.
int led = 9;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is

/*
 * Initialize the serial port.
 */
void setup( )
{
  Serial.begin( 9600);

// declare pin 9 for DC fan
  pinMode(led, OUTPUT);

}

/*
 * Poll for a measurement, keeping the state machine alive.  Returns
 * true if a measurement is available.
 */
static bool measure_environment( float *temperature, float *humidity )
{
  static unsigned long measurement_timestamp = millis( );

/* Measure once every four seconds. */
  if( millis( ) - measurement_timestamp > 1000ul )
  {
    if( dht_sensor.measure( temperature, humidity ) == true )
    {
      measurement_timestamp = millis( );
      return( true );
    }
  }

return( false );
}

/*
 * Main program loop.
 */
void loop( )
{
  float temperature;
  float humidity;
  float t;
  float rh;
  float HI;

/* Measure temperature and humidity.  If the functions returns
     true, then a measurement is available. */
  if( measure_environment( &temperature, &humidity ) == true )
  {

t=temperature;
    rh=humidity;
    HI=-8.78469475556+(1.61139411*t)+( 2.33854883889*rh)+(-0.14611605*t*rh)+(-0.012308094*t*t)+(-0.0164248277778*rh*rh)+(0.002211732*t*t*rh)+(0.00072546*t*rh*rh)+(-0.000003582*t*t*rh*rh);

Serial.print( "T = " );
    Serial.print( temperature, 1 );
    Serial.print( " deg. C, H = " );
    Serial.print( humidity, 1 );
    Serial.println( "%" );
    Serial.print("Heat Index = ");
    Serial.print(HI, 1);
    Serial.print( " deg. C,  " );
  }

if (HI>=26 && HI<=33) {
  //set the speed of the DC fan here
  brightness = 21;
  }

if (HI>33 && HI<=40) {
  //set the speed of the DC fan here
  brightness = 150;
  }

if (HI>40 && HI<=50) {
  //set the speed of the DC fan here
  brightness = 225;
  }

// set the brightness of pin 9:
  analogWrite(led, brightness);

// wait for 30 milliseconds to see the dimming effect
  delay(30);

}

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