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Aerocache.ino

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+#include <LiquidCrystal.h>
+LiquidCrystal lcd();
+
+/*
+  https://www.arduino.cc/en/Reference/LiquidCrystalConstructor
+  
+  1. Check if chipset is compatible
+  2. Plug in correct parameters
+
+*/
+
+
+int pin = 8;
+
+unsigned long duration;
+
+unsigned long starttime;
+
+unsigned long sampletime_ms = 30000;    //30 SECONDS
+
+unsigned long lowpulseoccupancy = 0;    //TIME SPENT IN LOW STATE OF PWM
+
+float ratio = 0;
+
+float concentration = 0;
+
+void setup() {
+
+    Serial.begin(9600);
+
+    pinMode(pin,INPUT);
+
+    starttime = millis();   //GETS CURRENT TIME
+
+    Serial.print("Low Pulse Occupancy");
+    Serial.print(" | ");
+    Serial.print("Ratio");
+    Serial.print(" | ");
+    Serial.println("Concentration");
+}
+
+void loop() {
+    duration = pulseIn(pin, LOW);
+
+    lowpulseoccupancy += duration;
+
+    if ((millis()-starttime) > sampletime_ms) {
+
+        ratio = lowpulseoccupancy/(sampletime_ms*10.0);   //CONVERTS TIME SPENT IN LOW STATE TO %
+
+        concentration = 1.1 * pow(ratio,3) - 3.8 * pow(ratio,2) + 520 * ratio + 0.62;  // if x is ratio, then y = 1.1*​x^​3-​3.8*​x^​2+​520*​x+​0.62            
+
+
+        lcd.setCursor(0, 0);
+        lcd.print("PM10 ");
+        lcd.setCursor(6, 0);
+        lcd.print(concentration1,3);
+
+        Serial.print(lowpulseoccupancy);
+        Serial.print(" | ");
+        Serial.print(ratio);
+        Serial.print(" | ");
+        Serial.println(concentration);
+
+
+        if (concentration1 < 1000) {
+
+          lcd.setCursor (0, 1);
+
+//          for (int i = 0; i < 16; ++i)
+//             {
+//                lcd.write(' ');
+//             }
+
+          lcd.setCursor(4, 1);
+          lcd.print("CLEAN");
+
+        }
+        else if (concentration1 >= 1000 && concentration1 < 10000) {
+
+          lcd.setCursor (0, 1);
+
+//          for (int i = 0; i < 16; ++i)
+//            {
+//                lcd.write(' ');
+//            }
+
+          lcd.setCursor(4, 1);
+          lcd.print("GOOD");
+
+        }
+        else if (concentration1 >= 10000 && concentration1 < 20000) {
+
+          lcd.setCursor (0, 1);
+
+//          for (int i = 0; i < 16; ++i)
+//            {
+//                lcd.write(' ');
+//            }
+
+          lcd.setCursor(4, 1);
+          lcd.print("ACCEPTABLE");
+
+        }
+
+        if (concentration1 >= 20000 && concentration1 < 50000) {
+
+          lcd.setCursor (0, 1);
+
+//          for (int i = 0; i < 16; ++i)
+//            {
+//                lcd.write(' ');
+//            }
+
+          lcd.setCursor(4, 1);
+          lcd.print("HEAVY");
+
+        }
+
+        if (concentration1 >= 50000 ) {
+
+          lcd.setCursor (0, 1);
+
+//          for (int i = 0; i < 16; ++i)
+//            {
+//                lcd.write(' ');
+//            }
+
+          lcd.setCursor(4, 1);
+          lcd.print("HAZARD");
+
+        } 
+
+
+        lowpulseoccupancy = 0;
+        starttime = millis();
+    }
+}