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Air_Quality_Sensor_PPD42/code/arduinomega_code/arduinomega_code.ino

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+#include <math.h>
+
+int DustSensePin = 13;
+
+//let's start with 100 readings. (copy and paste)
+unsigned int airreading[100] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+unsigned long starttime = 0;
+unsigned long sampletime_ms = 60000;//sample 60s == 60000 ;
+unsigned long lowpulseoccupancy = 0;
+float ratio = 0;
+float concentration = 0;
+unsigned int x = 0;
+unsigned int toplimit = 0;
+unsigned long sum = 0; //highest number possible - 32 bit unsigned, so 4 billion
+unsigned int average = 0;
+
+
+void setup() 
+{
+    Serial.begin(9600);
+    Serial.println("Starting Air Sensor, please wait for readings...");
+    pinMode(DustSensePin,INPUT);
+    starttime = millis();//get the current time;
+}
+
+void loop() 
+{
+
+    airreading[x] = pulseIn(DustSensePin, LOW, 500000);
+    
+    /*lowpulseoccupancy = lowpulseoccupancy+duration;
+
+    if ((millis()-starttime) > sampletime_ms)//if the sample time == 30s
+    {
+        ratio = lowpulseoccupancy/(sampletime_ms*10.0);  // Integer percentage 0=>100
+        concentration = 1.1*powf(ratio,3)-3.8*powf(ratio,2)+520*ratio+0.62; // using spec sheet curve
+        Serial.print(lowpulseoccupancy);
+        Serial.print(",");
+        Serial.print(ratio);
+        Serial.print(",");
+        Serial.println(concentration);
+        lowpulseoccupancy = 0;
+        starttime = millis();
+    }
+    */
+    //if ((millis()-starttime) > sampletime_ms){
+      
+      //KISS. Relative readings only.
+      //Something else keeps the time.
+      if (airreading[x] != 0){
+        Serial.println(airreading[x]);
+        x=x+1;
+          if(x>100){
+            x = 0;
+          }
+      }
+     
+      //starttime = millis();
+    //}
+    
+    
+    //KISS. Average for a minute, and store that data in a webpage (that part will be in ethernet sensor test 3). 
+    //
+    if ((millis()-starttime) > sampletime_ms){
+      toplimit = x; // don't read the zeros
+      
+      
+      if(toplimit == 0){
+      toplimit = 1; //to avoid divide by zero, in case sum / toplimit is both zero
+      }
+      
+      for (x=0; x<toplimit; x++){
+        sum = sum + airreading[x];
+        
+      }
+      average = sum / toplimit;
+      Serial.print("Average Get!:  ");
+      Serial.println(average); //average when 0 is 65535, so it's invalid (dividing by zero  - sum divided by top limit which are both zero)
+                                 //but we don't even want the average. It's just for testing here.
+      Serial.print("Sum Get!:  ");
+      Serial.println(sum); //this is what we care about
+      
+      //reset everything after a minute
+      sum = 0;
+      average = 0;
+      x = 0;
+      toplimit = 0;
+      for (x=0; x<toplimit; x++){
+        airreading[x] = 0;
+      }
+      starttime = millis();
+    }
+}

Air_Quality_Sensor_PPD42/code/text_entry_lcd_test_mega2ino/text_entry_lcd_test_mega2ino.ino

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+#include <Adafruit_GFX.h>    // Core graphics library
+#include <MCUFRIEND_kbv.h>   // Hardware-specific library
+MCUFRIEND_kbv tft;
+
+#include <Fonts/FreeSans9pt7b.h>
+#include <Fonts/FreeSans12pt7b.h>
+#include <Fonts/FreeSerif12pt7b.h>
+
+#include <FreeDefaultFonts.h>
+
+#define BLACK   0x0000
+#define RED     0xF800
+#define GREEN   0x07E0
+#define WHITE   0xFFFF
+#define GREY    0x8410
+
+#include <math.h>
+
+int DustSensePin = 13;
+
+//globals for ppd42 dust sensor
+//let's start with 100 readings. (copy and paste)
+unsigned int airreading[100] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+unsigned long starttime = 0;
+unsigned long sampletime_ms = 60000;//sample 60s == 60000 ;
+unsigned long lowpulseoccupancy = 0;
+float ratio = 0;
+float concentration = 0;
+unsigned int x = 0;
+unsigned int toplimit = 0;
+unsigned long sum = 0; //highest number possible - 32 bit unsigned, so 4 billion
+unsigned int average = 0;
+//end ppd42
+
+
+int brightnessread = 0;
+
+int cat = 0;
+int resultsread1 = 0;
+
+void setup(void)
+{
+    Serial.begin(9600);
+    uint16_t ID = tft.readID();
+    if (ID == 0xD3) ID = 0x9481;
+    tft.begin(ID);
+    tft.setRotation(1);
+    tft.WriteCmdData(0x51, 0x00);
+    //resultsread1 = tft.readReg(0x52);
+    //writeData(0x51);
+    pinMode(DustSensePin,INPUT);
+    starttime = millis();//get the current time;
+    
+    
+}
+
+void loop(void)
+{
+ 
+    
+    
+    
+    tft.fillScreen(BLACK);
+    tft.WriteCmdData(0x51, 0x0000);
+    tft.setTextColor(0XFFFF);
+    tft.setTextSize(2);
+    tft.setCursor(0, 36);
+    tft.println("running sensor now");
+
+
+    airreading[x] = pulseIn(DustSensePin, LOW, 500000);
+    tft.println("Results are in:");
+    //tft.println(airreading)
+  if ((millis()-starttime) > sampletime_ms)//if the sample time == 30s
+    {
+        ratio = lowpulseoccupancy/(sampletime_ms*10.0);  // Integer percentage 0=>100
+        concentration = 1.1*powf(ratio,3)-3.8*powf(ratio,2)+520*ratio+0.62; // using spec sheet curve
+        tft.println(lowpulseoccupancy);
+        //tft.print(",");
+        tft.println(ratio);
+        //Serial.print(",");
+        tft.println(concentration);
+        lowpulseoccupancy = 0;
+        starttime = millis();
+    }
+    
+    
+}
+
+void showmsgXY(int x, int y, int sz, const GFXfont *f, const char *msg)
+{
+    int16_t x1, y1;
+    uint16_t wid, ht;
+    tft.drawFastHLine(0, y, tft.width(), WHITE);
+    tft.setFont(f);
+    tft.setCursor(x, y);
+    tft.setTextColor(GREEN);
+    tft.setTextSize(sz);
+    tft.print(msg);
+    delay(1000);
+}
+
+
+uint32_t readReg32(uint16_t reg)
+{
+    uint16_t h = tft.readReg(reg, 0);
+    uint16_t l = tft.readReg(reg, 1);
+    return ((uint32_t) h << 16) | (l);
+}