send.ino

   1 // Licence: WTFPLv2 <http://www.wtfpl.net/txt/copying/>
   2 // Copyright 2015: Julien Moutinho <julm+air@autogeree.net>
   3
   4 #include <Wire.h>
   5 #include <SeeedGrayOLED.h>
   6 #include "AirQuality.h"
   7 #include "Arduino.h"
   8 #include "DHT.h"
   9 #define DHTPIN 2
  10  // What pin the DHT is connected to.
  11
  12 // Uncomment whatever type you're using!
  13 //#define DHTTYPE DHT11 // DHT 11
  14 #define DHTTYPE DHT22 // DHT 22 (AM2302)
  15 DHT dht(DHTPIN, DHTTYPE);
  16
  17 AirQuality airqualitysensor;
  18 int current_quality = -1;
  19 #define BUZZER 10
  20
  21 int dust_pin = 4;
  22 unsigned long duration;
  23 unsigned long starttime;
  24 unsigned long sampletime_ms = 30000;
  25 unsigned long lowpulseoccupancy = 0;
  26 unsigned long counter;
  27 float ratio = 0;
  28 float concentration = 0;
  29
  30 void setup() {
  31         Serial.begin(9600);
  32         //while (!Serial) {
  33         //  ; // wait for serial port to connect. Needed for native USB port only
  34         // }
  35
  36         Wire.begin();                            // Initialize I2C
  37         SeeedGrayOled.init();                    // Initialize SEEED OLED display
  38         SeeedGrayOled.clearDisplay();            // Clear the screen and set start position to top left corner
  39         SeeedGrayOled.setNormalDisplay();        // Set display to normal mode (i.e non-inverse mode)
  40         SeeedGrayOled.setVerticalMode();
  41         //SeeedGrayOled.setPageMode();           // Set addressing mode to Page Mode
  42         SeeedGrayOled.setTextXY(0,0);            // Set the cursor to Xth Page, Yth Column
  43         SeeedGrayOled.putString("Initializing"); // Print the String
  44
  45         pinMode(BUZZER, OUTPUT);
  46         digitalWrite(BUZZER, LOW);
  47         airqualitysensor.init(14);
  48         dht.begin();
  49
  50         pinMode(dust_pin,INPUT);
  51         starttime = millis(); // Get the current time
  52         Serial.println("counter;uptime;humidity;temperature;quality;particules");
  53  }
  54
  55 void loop() {
  56         // Reading temperature or humidity takes about 250 milliseconds!
  57         // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  58         float h = dht.readHumidity();
  59         float t = dht.readTemperature();
  60         counter = counter + 1;
  61         SeeedGrayOled.setTextXY(8,0);
  62         // Check if returns are valid,
  63         // if they are NaN (not a number)
  64         // then something went wrong!
  65         Serial.print(counter);
  66         Serial.write(';');
  67         Serial.print(millis());
  68         if (isnan(t) || isnan(h)) {
  69                 SeeedGrayOled.putString("DHT ERROR");
  70                 Serial.write(';');
  71                 Serial.write(';');
  72          }
  73         else {
  74                 SeeedGrayOled.putString("Humidity:");
  75                 SeeedGrayOled.setTextXY(9,0);
  76                 SeeedGrayOled.putString("   ");
  77                 SeeedGrayOled.putFloat(h);
  78                 SeeedGrayOled.putString("%");
  79                 SeeedGrayOled.setTextXY(10,0);
  80                 SeeedGrayOled.putString("Temp.:");
  81                 SeeedGrayOled.setTextXY(11,0);
  82                 SeeedGrayOled.putString("   ");
  83                 SeeedGrayOled.putFloat(t);
  84                 SeeedGrayOled.putString("*C");
  85                 Serial.write(';');
  86                 Serial.print(h);
  87                 Serial.write(';');
  88                 Serial.print(t);
  89          }
  90         Serial.write(';');
  91         Serial.print(airqualitysensor.first_vol,DEC);
  92
  93         // Checking Air Quality
  94         current_quality=airqualitysensor.slope();
  95         if (current_quality >= 0) {
  96                 if (current_quality <= 1)
  97                         // Air quality is bad.
  98                         // Let's revert display to make some light!
  99                         SeeedGrayOled.setInverseDisplay();
 100                 else
 101                         SeeedGrayOled.setNormalDisplay();
 102
 103                 SeeedGrayOled.setTextXY(2,0);
 104                 SeeedGrayOled.putString("Air Quality:"); // Print the String
 105                 SeeedGrayOled.setTextXY(3,3);
 106                 SeeedGrayOled.putNumber(airqualitysensor.first_vol); // Print the String
 107                 SeeedGrayOled.putString("   "); // Clear any old character
 108
 109                 SeeedGrayOled.setTextXY(0,0);
 110                 if (current_quality==0)
 111                 SeeedGrayOled.putString("Emergency   ");
 112                 else if (current_quality==1)
 113                 SeeedGrayOled.putString("Hi Pollution");
 114                 else if (current_quality==2)
 115                 SeeedGrayOled.putString("Low Polution");
 116                 else if (current_quality==3)
 117                 SeeedGrayOled.putString("Air OK :-)  ");
 118
 119                 if (current_quality<1)
 120                         digitalWrite(BUZZER, HIGH);
 121                 else
 122                         digitalWrite(BUZZER, LOW);
 123          }
 124
 125         // Checking Dust Sensor
 126         duration = pulseIn(dust_pin, LOW);
 127         lowpulseoccupancy = lowpulseoccupancy+duration;
 128
 129         Serial.write(';');
 130         if ((millis()-starttime) > sampletime_ms) {
 131          //if the sample time == 30s
 132                 ratio = lowpulseoccupancy / (sampletime_ms*10.0); // Integer percentage 0=>100
 133                 concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // Using spec sheet curve
 134                 /*
 135                 Serial.print(lowpulseoccupancy);
 136                 Serial.write(';');
 137                 Serial.print(ratio);
 138                 */
 139                 Serial.print(concentration);
 140                 SeeedGrayOled.setTextXY(4,0);
 141                 SeeedGrayOled.putString("Particles:");
 142                 SeeedGrayOled.setTextXY(5,3);
 143                 SeeedGrayOled.putString("    ");
 144                 SeeedGrayOled.setTextXY(5,3);
 145                 SeeedGrayOled.putNumber(concentration);
 146                 lowpulseoccupancy = 0;
 147                 starttime = millis();
 148          }
 149         Serial.println();
 150  }
 151
 152 ISR(TIMER2_OVF_vect) {
 153         if(airqualitysensor.counter==122) {
 154          // set 2 seconds as a detected duty
 155                 airqualitysensor.last_vol=airqualitysensor.first_vol;
 156                 airqualitysensor.first_vol=analogRead(A0);
 157                 airqualitysensor.counter=0;
 158                 airqualitysensor.timer_index=1;
 159                 //PORTB=PORTB^0x20;
 160          }
 161         else {
 162                 airqualitysensor.counter++;
 163          }
 164  }