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;
 }
@@ -75,69 +96,78 @@ void setup() {
 }
 
 void loop() {
-    uint16_t error;
-    char errorMessage[256];
+    currentTime = millis();
 
-    delay(1000);
+    delay(20);
 
-    // Read Measurement
-    uint16_t massConcentrationPm1p0;
-    uint16_t massConcentrationPm2p5;
-    uint16_t massConcentrationPm4p0;
-    uint16_t massConcentrationPm10p0;
-    float vocIndex;
-    float ambientHumidity;
-    float ambientTemperature;
-    float feelsLikeTemperature;
+    if (currentTime - buttonTime >= 100) {
+        buttonTime = currentTime;
 
-    error = sen44.readMeasuredMassConcentrationAndAmbientValues(
-            massConcentrationPm1p0, massConcentrationPm2p5, massConcentrationPm4p0,
-            massConcentrationPm10p0, vocIndex, ambientHumidity, ambientTemperature);
-
-    if (error) {
-        Serial.print("Error trying to execute "
-                     "readMeasuredMassConcentrationAndAmbientValues(): ");
-        errorToString(error, errorMessage, 256);
-        Serial.println(errorMessage);
-        return;
+        if (digitalRead(buttonPin) == LOW) {
+            isStandardValues = !isStandardValues;
+        }
     }
 
-    ambientTemperature = celsiusToFahrenheit(ambientTemperature);
-    feelsLikeTemperature = heatIndex(ambientTemperature, ambientHumidity);
+    if (currentTime - sen44Time >= 1000) {
+        sen44Time = currentTime;
 
-    lcd.clear();
+        uint16_t error;
+        char errorMessage[256];
 
-    if (digitalRead(buttonPin) == LOW) {
-        lcd.setCursor(0, 0);
-        lcd.print(" 1:");
-        lcd.print(massConcentrationPm1p0);
+        // Read Measurement
+        error = sen44.readMeasuredMassConcentrationAndAmbientValues(
+                massConcentrationPm1p0, massConcentrationPm2p5, massConcentrationPm4p0,
+                massConcentrationPm10p0, vocIndex, ambientHumidity, ambientTemperature);
 
-        lcd.setCursor(8, 0);
-        lcd.print(" 2:");
-        lcd.print(massConcentrationPm2p5);
+        if (error) {
+            Serial.print("Error trying to execute "
+                         "readMeasuredMassConcentrationAndAmbientValues(): ");
+            errorToString(error, errorMessage, 256);
+            Serial.println(errorMessage);
+            return;
+        }
 
-        lcd.setCursor(0, 1);
-        lcd.print(" 4:");
-        lcd.print(massConcentrationPm4p0);
+        ambientTemperature = celsiusToFahrenheit(ambientTemperature);
+        feelsLikeTemperature = heatIndex(ambientTemperature, ambientHumidity);
+    }
 
-        lcd.setCursor(8, 1);
-        lcd.print("10:");
-        lcd.print(massConcentrationPm10p0);
-    } else {
-        lcd.setCursor(0, 0);
-        lcd.print("t:");
-        lcd.print(round(ambientTemperature));
+    if (currentTime - lcdTime >= 500) {
+        lcdTime = currentTime;
 
-        lcd.setCursor(8, 0);
-        lcd.print("h:");
-        lcd.print(round(ambientHumidity));
+        lcd.clear();
 
-        lcd.setCursor(0, 1);
-        lcd.print("f:");
-        lcd.print(round(feelsLikeTemperature));
+        if (isStandardValues) {
+            lcd.setCursor(0, 0);
+            lcd.print("t:");
+            lcd.print(round(ambientTemperature));
 
-        lcd.setCursor(8, 1);
-        lcd.print("v:");
-        lcd.print(vocIndex, 0);
+            lcd.setCursor(8, 0);
+            lcd.print("h:");
+            lcd.print(round(ambientHumidity));
+
+            lcd.setCursor(0, 1);
+            lcd.print("f:");
+            lcd.print(round(feelsLikeTemperature));
+
+            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);
+        }
     }
 }