simulate parallelism

aqi.ino

@@ -8,6 +8,26 @@ SensirionI2CSen44 sen44;
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 const int buttonPin = 6;
 
+// to simulate "parallelism"
+unsigned long currentTime;
+unsigned long sen44Time  = 0;
+unsigned long lcdTime = 0;
+unsigned long buttonTime = 0;
+
+// display standard values by default
+bool isStandardValues = true;
+
+// sen44 values
+uint16_t massConcentrationPm1p0  = 0;
+uint16_t massConcentrationPm2p5  = 0;
+uint16_t massConcentrationPm4p0  = 0;
+uint16_t massConcentrationPm10p0 = 0;
+float vocIndex                   = 0;
+float ambientHumidity            = 0;
+float ambientTemperature         = 0;
+float feelsLikeTemperature       = 0;
+
+// calculate heat index
 float heatIndex(float t, float rh) {
     float hi = 0.0;
     if (t <= 40.0)
@@ -32,6 +52,7 @@ float heatIndex(float t, float rh) {
     return hi;
 }
 
+// convert celcius to fahrenheit
 float celsiusToFahrenheit(float degrees) {
     return degrees * 1.8 + 32;
 }
@@ -75,21 +96,25 @@ void setup() {
 }
 
 void loop() {
+    currentTime = millis();
+
+    delay(20);
+
+    if (currentTime - buttonTime >= 100) {
+        buttonTime = currentTime;
+
+        if (digitalRead(buttonPin) == LOW) {
+            isStandardValues = !isStandardValues;
+        }
+    }
+
+    if (currentTime - sen44Time >= 1000) {
+        sen44Time = currentTime;
+
         uint16_t error;
         char errorMessage[256];
 
-    delay(1000);
-
         // Read Measurement
-    uint16_t massConcentrationPm1p0;
-    uint16_t massConcentrationPm2p5;
-    uint16_t massConcentrationPm4p0;
-    uint16_t massConcentrationPm10p0;
-    float vocIndex;
-    float ambientHumidity;
-    float ambientTemperature;
-    float feelsLikeTemperature;
-
         error = sen44.readMeasuredMassConcentrationAndAmbientValues(
                 massConcentrationPm1p0, massConcentrationPm2p5, massConcentrationPm4p0,
                 massConcentrationPm10p0, vocIndex, ambientHumidity, ambientTemperature);
@@ -104,26 +129,14 @@ void loop() {
 
         ambientTemperature = celsiusToFahrenheit(ambientTemperature);
         feelsLikeTemperature = heatIndex(ambientTemperature, ambientHumidity);
+    }
+
+    if (currentTime - lcdTime >= 500) {
+        lcdTime = currentTime;
 
         lcd.clear();
 
-    if (digitalRead(buttonPin) == LOW) {
+        if (isStandardValues) {
-        lcd.setCursor(0, 0);
-        lcd.print(" 1:");
-        lcd.print(massConcentrationPm1p0);
-
-        lcd.setCursor(8, 0);
-        lcd.print(" 2:");
-        lcd.print(massConcentrationPm2p5);
-
-        lcd.setCursor(0, 1);
-        lcd.print(" 4:");
-        lcd.print(massConcentrationPm4p0);
-
-        lcd.setCursor(8, 1);
-        lcd.print("10:");
-        lcd.print(massConcentrationPm10p0);
-    } else {
             lcd.setCursor(0, 0);
             lcd.print("t:");
             lcd.print(round(ambientTemperature));
@@ -139,5 +152,22 @@ void loop() {
             lcd.setCursor(8, 1);
             lcd.print("v:");
             lcd.print(vocIndex, 0);
+        } else {
+            lcd.setCursor(0, 0);
+            lcd.print(" 1:");
+            lcd.print(massConcentrationPm1p0);
+
+            lcd.setCursor(8, 0);
+            lcd.print(" 2:");
+            lcd.print(massConcentrationPm2p5);
+
+            lcd.setCursor(0, 1);
+            lcd.print(" 4:");
+            lcd.print(massConcentrationPm4p0);
+
+            lcd.setCursor(8, 1);
+            lcd.print("10:");
+            lcd.print(massConcentrationPm10p0);
+        }
     }
 }