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DEMS/DEMS.ino

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+
+#include <DHT.h>
+#include <DHT_U.h>
+#include <Adafruit_Sensor.h>
+#include <Wire.h>
+#include <Adafruit_BMP085.h>
+
+
+//Constants
+#define DHTPIN 2   // what pin we're connected to
+#define DHTTYPE DHT22   // DHT 22  (AM2302)
+#define seaLevelPressure_hPa 1013.25
+DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino
+Adafruit_BMP085 bmp;
+
+//Variables
+int chk;
+float hum;  //Stores humidity value
+float temp; //Stores temperature value
+ int measurePin = 1; //Connect dust sensor to Arduino A0 pin
+int ledPower = 2;   //Connect 3 led driver pins of dust sensor to Arduino D2
+
+int samplingTime = 280;
+int deltaTime = 40;
+int sleepTime = 9680;
+
+float voMeasured = 0;
+float calcVoltage = 0;
+float dustDensity = 0;
+int sensorValue = 0;
+
+void setup()
+{
+  Serial.begin(9600);
+  dht.begin();
+  pinMode(ledPower,OUTPUT);
+  pinMode(A0, INPUT);  
+  pinMode(9, OUTPUT); 
+  if (!bmp.begin()) 
+  {
+    Serial.println("Could not find a valid BMP085 sensor, check wiring!");
+    while (1) {}
+  }
+}
+
+void loop()
+{
+    delay(100);
+    //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(" Celsius");
+    digitalWrite(ledPower,LOW); // power on the LED
+    delayMicroseconds(samplingTime);
+
+    voMeasured = analogRead(measurePin); // read the dust value
+
+    delayMicroseconds(deltaTime);
+    digitalWrite(ledPower,HIGH); // turn the LED off
+    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 density: ");
+    Serial.println(dustDensity); // unit: ug/m3
+    sensorValue = analogRead(A0); 
+    Serial.print("Light density: ");
+    Serial.println(sensorValue); 
+    analogWrite(9, map(sensorValue,0,1023,0,255)); 
+
+    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());
+    Serial.println(" meters");
+
+    Serial.println(); 
+    delay(1000); 
+}