sketch_apr19a.ino

//INCLUDES
#include <DHT.h>
#include <Wire.h>
#include <Adafruit_BMP085.h>

//DEFINITIONS
#define DHTPIN 7     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
#define seaLevelPressure_hPa 1013.25

Adafruit_BMP085 bmp;
 
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino


//VARIABLES
int chk;
float hum;  //Stores humidity value
float temp; //Stores temperature value
int dust; //Connect dust sensor to Arduino A0 pin
int samplingTime = 280;
int deltaTime = 40;
int sleepTime = 9680;
float voMeasured = 0;
float calcVoltage = 0;
float dustDensity = 0;


void setup()
{
  Serial.begin(9600);
  dht.begin();
}


void readLightSensor() {
  //LIGHT
  unsigned int light;
  //Serial.print("RAW Light data: ");
  light = analogRead(A0);
  //Serial.println(light);
  if(light>=400 && light<700)
  {
    Serial.println("Normal lighting conditions");
  }
  else if(light<400)
  {
    Serial.println("Too bright");
  }

  else if(light>1000)
  {
    Serial.println("Dark environmental conditions");
  }
}

void readTemperatureHumidity() {
  //Temp & Humdidity
  //Read data and store it to variables hum and temp
  hum = dht.readHumidity();
  temp= dht.readTemperature();
  //Print temp and humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(hum);
  Serial.print("%, Temp: ");
  Serial.print(temp);
  Serial.println("C");
}

void readUVSensor() {
  //UV values
  float sensorVoltage;
  float uv_sensor;
  uv_sensor = analogRead(1);
  sensorVoltage = uv_sensor/1024*5.0;
  //Serial.print("UV data= ");
  //Serial.print(uv_sensor);
  //Serial.print("UV sensor voltage = ");
  //Serial.print(sensorVoltage);
  //Serial.println(" V");
  if(uv_sensor<=5)
  {
    Serial.println("Normal UV detected");
  }

  else if(uv_sensor>5)
  {
    Serial.println("High atmospheric UV detected");
  }
}

void readDustSensor() {
  //dust
  // power on the LED
  delayMicroseconds(samplingTime);

  voMeasured = analogRead(A0); // read the dust value

  delayMicroseconds(deltaTime);

  delayMicroseconds(sleepTime);

  // 0 - 5V mapped to 0 - 1023 integer values
  // recover voltage
  calcVoltage = voMeasured * (5.0 / 1024.0);

  // linear eqaution taken from http://www.howmuchsnow.com/arduino/airquality/
  // Chris Nafis (c) 2012
  dustDensity = 170 * calcVoltage - 0.1;

  Serial.print("Dust particles: ");
  Serial.print(dustDensity);
  Serial.println("PPM");
}

void readBarometricPressure() {
  //Baro
  Serial.print("Temperature = ");
  Serial.print(bmp.readTemperature());
  Serial.println(" *C");
 
  Serial.print("Pressure = ");
  Serial.print(bmp.readPressure());
  Serial.println(" Pa");

  Serial.print("Altitude = ");
  Serial.print((bmp.readAltitude()/100)*2.77);
Serial.println(" meters");

Serial.print("Pressure at sea level = ");
Serial.print(bmp.readSealevelPressure());
Serial.println(" Pa");
}

void readRainSensor() {
int value = analogRead(3);
//Serial.println("Rain data:");
//Serial.println(value);
//value = map(value,0,1023,225,0);
//Serial.println(value);
if(value >= 1000) {
Serial.println("Rain detected");
}
else {
Serial.println("No rain detected");
}
}

void loop() {
// read and print data from sensors
readLightSensor();
readTemperatureHumidity();
readUVSensor();
readDustSensor();
readBarometricPressure();
readRainSensor();

// wait for some time before reading again
delay(3000);
}