Display also humidity and pressure

Display update triggered by value change, not interval

bme280.ino

@@ -1,23 +1,50 @@
 #include "Seeed_BME280.h"
 
+enum {
+  LOWER = 0,
+  HIGHER
+};
+
 BME280 sensor;
-float highTemp = 0.0, lowTemp = 0.0;
-const float blindZone = 0.03;
+float bounds[2][SENSORS] = {};
+const float hysteresisWidth[SENSORS] = {0.03, 0.5, 0.5};
 
 void initBME280() {
   sensor.init();
 }
 
-void readTemperature() {
-  float newTemperature = sensor.getTemperature();
+void readSensors() {
+  float newValue;
 
-  if (newTemperature > highTemp) {
-    temperature = newTemperature;
-    highTemp = newTemperature;
-    lowTemp = highTemp - blindZone;
-  } else if (newTemperature < lowTemp) {
-    temperature = newTemperature;
-    lowTemp = newTemperature;
-    highTemp = lowTemp + blindZone;
+  for (uint i = 0; i < SENSORS; i++) {
+    switch (i) {
+      case TEMPERATURE:
+        newValue = sensor.getTemperature();
+        break;
+
+      case HUMIDITY:
+        newValue = sensor.getHumidity();
+        break;
+
+      case PRESSURE:
+        newValue = sensor.getPressure();
+        break;
+    }
+
+    if (newValue > bounds[HIGHER][i]) {
+      sensorValue[i] = newValue;
+      bounds[HIGHER][i] = newValue;
+      bounds[LOWER][i] = bounds[HIGHER][i] - hysteresisWidth[i];
+      if ((countdown <= 0) && (displaySensor == i)) {
+        displayNeedsUpdate = true;
+      }
+    } else if (newValue < bounds[LOWER][i]) {
+      sensorValue[i] = newValue;
+      bounds[LOWER][i] = newValue;
+      bounds[HIGHER][i] = bounds[LOWER][i] + hysteresisWidth[i];
+      if ((countdown <= 0) && (displaySensor == i)) {
+        displayNeedsUpdate = true;
+      }
+    };
   };
 }