take measurements once per minute

src/main.cpp

@@ -49,6 +49,18 @@ Adafruit_VEML6075 uv = Adafruit_VEML6075();
 XD0OTA ota("esp32-weatherstation");
 XD0MQTT mqtt;
 
+struct __attribute__((packed)) {
+  float temperature = 0.0; // °C
+  float humidity = 0.0; // %H
+  float pressure = 0.0; // Pa
+  uint32_t voc = 0; // Ohm
+  float pm10 = 0.0; // µg/m³
+  float pm25 = 0.0; // µg/m³
+  float uvi = 0.0;
+  float uva = 0.0;
+  float uvb = 0.0;
+} sensor_readings;
+
 uint32_t lastDisplayUpdate = 0;
 bool bme280_active = false;
 bool bme680_active = false;
@@ -104,102 +116,100 @@ void getTime(char* ptr, size_t maxsize, const char* format) {
 }
 
 
-void printValues() {
+void getSensorMeasurements() {
   if (bme280_active) {
-    #define SEALEVELPRESSURE_HPA (1013.25)
+    bme280.takeForcedMeasurement();
-    Serial.print("Temperature = ");
+    sensor_readings.temperature = bme280.readTemperature();
-    Serial.print(bme280.readTemperature());
+    sensor_readings.humidity = bme280.readHumidity();
-    Serial.println(" *C");
+    sensor_readings.pressure = bme280.readPressure();
-
+  }
-    Serial.print("Pressure = ");
+  if (bme680_active) {
-
+    if (bme680.performReading()) {
-    Serial.print(bme280.readPressure() / 100.0F);
+      sensor_readings.temperature = bme680.temperature;
-    Serial.println(" hPa");
+      sensor_readings.humidity = bme680.humidity;
-
+      sensor_readings.pressure = bme680.pressure;
-    Serial.print("Approx. Altitude = ");
+      sensor_readings.voc = bme680.gas_resistance;
-    Serial.print(bme280.readAltitude(SEALEVELPRESSURE_HPA));
+    } else {
-    Serial.println(" m");
+      Serial.println("Failed to perform reading :(");
+    }
+  }
 
-    Serial.print("Humidity = ");
+  if (uv_active) {
-    Serial.print(bme280.readHumidity());
+    sensor_readings.uvi = uv.readUVI();
-    Serial.println(" %");
+    sensor_readings.uva = uv.readUVA();
+    sensor_readings.uvb = uv.readUVB();
+  }
 
-    Serial.println();
+  if (sds_active) {
+    PmResult pm = sds.readPm();
+    if (pm.isOk()) {
+      sensor_readings.pm10 = pm.pm10;
+      sensor_readings.pm25 = pm.pm25;
+    }
+  }
 }
 
-  if (bme680_active) {
+
+void printValues() {
+  if (bme280_active || bme680_active) {
     #define SEALEVELPRESSURE_HPA (1013.25)
     Serial.print("Temperature = ");
-    Serial.print(bme680.readTemperature());
+    Serial.print(sensor_readings.temperature);
     Serial.println(" *C");
 
     Serial.print("Pressure = ");
 
-    Serial.print(bme680.readPressure() / 100.0F);
+    Serial.print(sensor_readings.pressure / 100.0F);
     Serial.println(" hPa");
 
-    Serial.print("Approx. Altitude = ");
-    Serial.print(bme680.readAltitude(SEALEVELPRESSURE_HPA));
-    Serial.println(" m");
-
     Serial.print("Humidity = ");
-    Serial.print(bme680.readHumidity());
+    Serial.print(sensor_readings.humidity);
     Serial.println(" %");
+  }
 
-    Serial.println();
+  if (bme680_active) {
+    Serial.print("VOC = ");
+    Serial.print(sensor_readings.voc / 1000.0F);
+    Serial.println(" hPa");
   }
 
+  Serial.println();
+
   if (uv_active) {
-    Serial.print("UV Index reading: "); Serial.println(uv.readUVI());
+    Serial.print("UV Index reading: "); Serial.println(sensor_readings.uvi);
-    Serial.print("Raw UVA reading:  "); Serial.println(uv.readUVA());
+    Serial.print("Raw UVA reading:  "); Serial.println(sensor_readings.uva);
-    Serial.print("Raw UVB reading:  "); Serial.println(uv.readUVB());
+    Serial.print("Raw UVB reading:  "); Serial.println(sensor_readings.uvb);
+    Serial.println();
   }
-/*
+
   if (sds_active) {
-    PmResult pm = sds.readPm();
-    if (pm.isOk()) {
     Serial.print("PM2.5 = ");
-      Serial.print(pm.pm25);
+    Serial.print(sensor_readings.pm25);
     Serial.print(", PM10 = ");
-      Serial.println(pm.pm10);
+    Serial.println(sensor_readings.pm10);
-
-      // if you want to just print the measured values, you can use toString() method as well
-      Serial.println(pm.toString());
-    } else {
-      Serial.print("Could not read values from sensor, reason: ");
-      Serial.println(pm.statusToString());
   }
-  }
+
-*/
 }
 
 void sendValues() {
     /* send values MQTT */
-  if (bme280_active) {
+  if (bme280_active || bme680_active) {
     String topic_temperature = String("thomas/sensor/") + ota.getMAC() + String("/temperature");
     String topic_humidity = String("thomas/sensor/") + ota.getMAC() + String("/humidity");
     String topic_pressure = String("thomas/sensor/") + ota.getMAC() + String("/pressure");
-    char temperature[8]; sprintf(temperature, "%.2f", bme280.readTemperature());
+    char temperature[8]; sprintf(temperature, "%.2f", sensor_readings.temperature);
-    char humidity[7]; sprintf(humidity, "%.2f", bme280.readHumidity());
+    char humidity[7]; sprintf(humidity, "%.2f", sensor_readings.humidity);
-    char pressure[8]; sprintf(pressure, "%.2f", bme280.readPressure() / 100.0F);
+    char pressure[8]; sprintf(pressure, "%.2f", sensor_readings.pressure / 100.0F);
     mqtt.publish(topic_temperature.c_str(), temperature, strlen(temperature));
     mqtt.publish(topic_humidity.c_str(), humidity, strlen(humidity));
     mqtt.publish(topic_pressure.c_str(), pressure, strlen(pressure));
-  } else if (bme680_active) {
+  }
-    bme680.performReading();
+  if (bme680_active) {
-    String topic_temperature = String("thomas/sensor/") + ota.getMAC() + String("/temperature");
-    String topic_humidity = String("thomas/sensor/") + ota.getMAC() + String("/humidity");
-    String topic_pressure = String("thomas/sensor/") + ota.getMAC() + String("/pressure");
     String topic_voc = String("thomas/sensor/") + ota.getMAC() + String("/voc");
-    char temperature[8]; sprintf(temperature, "%.2f", bme680.readTemperature());
+    char voc[12]; sprintf(voc, "%.2f", sensor_readings.voc / 1000.0F);
-    char humidity[7]; sprintf(humidity, "%.2f", bme680.readHumidity());
-    char pressure[8]; sprintf(pressure, "%.2f", bme680.readPressure() / 100.0F);
-    char voc[12]; sprintf(voc, "%.2f", bme680.gas_resistance / 1000.0F);
-    mqtt.publish(topic_temperature.c_str(), temperature, strlen(temperature));
-    mqtt.publish(topic_humidity.c_str(), humidity, strlen(humidity));
-    mqtt.publish(topic_pressure.c_str(), pressure, strlen(pressure));
     mqtt.publish(topic_voc.c_str(), voc, strlen(voc));
-  } else {
+  }
+  if (!bme280_active && !bme680_active) {
     String topic_temperature = String("thomas/sensor/") + ota.getMAC() + String("/temperature");
     float esp32_temperature = (temprature_sens_read() - 32) / 1.8;
     char temperature[8]; sprintf(temperature, "%.2f", esp32_temperature-29.40);
@@ -210,29 +220,21 @@ void sendValues() {
     String topic_uvi = String("thomas/sensor/") + ota.getMAC() + String("/uvi");
     String topic_uva = String("thomas/sensor/") + ota.getMAC() + String("/uva");
     String topic_uvb = String("thomas/sensor/") + ota.getMAC() + String("/uvb");
-    char uvi[10]; sprintf(uvi, "%.2f", uv.readUVI());
+    char uvi[10]; sprintf(uvi, "%.2f", sensor_readings.uvi);
-    char uva[10]; sprintf(uva, "%.2f", uv.readUVA());
+    char uva[10]; sprintf(uva, "%.2f", sensor_readings.uva);
-    char uvb[10]; sprintf(uvb, "%.2f", uv.readUVB());
+    char uvb[10]; sprintf(uvb, "%.2f", sensor_readings.uvb);
     mqtt.publish(topic_uvi.c_str(), uvi, strlen(uvi));
     mqtt.publish(topic_uva.c_str(), uva, strlen(uva));
     mqtt.publish(topic_uvb.c_str(), uvb, strlen(uvb));
   }
 
   if (sds_active) {
-    PmResult pm = sds.readPm();
-    if (pm.isOk()) {
     String topic_pm10 = String("thomas/sensor/") + ota.getMAC() + String("/pm10");
-    char pm10[10]; sprintf(pm10, "%.2f", pm.pm10);
+    char pm10[10]; sprintf(pm10, "%.2f", sensor_readings.pm10);
     String topic_pm25 = String("thomas/sensor/") + ota.getMAC() + String("/pm25");
-    char pm25[10]; sprintf(pm25, "%.2f", pm.pm25);
+    char pm25[10]; sprintf(pm25, "%.2f", sensor_readings.pm25);
     mqtt.publish(topic_pm10.c_str(), pm10, strlen(pm10));
     mqtt.publish(topic_pm25.c_str(), pm25, strlen(pm25));
-
-      // if you want to just print the measured values, you can use toString() method as well
-      Serial.println(pm.toString());
-    }
-
-
   }
 
 }
@@ -345,6 +347,9 @@ void loop()
   /* Do an e-paper display refresh every 2 minutes */
   if (millis() - lastDisplayUpdate >= 1*60*1000) {
     lastDisplayUpdate = millis();
+
+    getSensorMeasurements();
+
     display.setFullWindow();
     display.setRotation(1);
     display.firstPage();
@@ -357,39 +362,29 @@ void loop()
       display.setFont(&FreeSans9pt7b);
       display.println("ESP32-Wetterstation");
       display.drawFastHLine(0, 14, display.width(), GxEPD_BLACK);
-      display.setFont(NULL);
+      //display.setFont(NULL);
       display.setCursor(0, 32);
-      if (bme280_active) {
+      if (bme280_active || bme680_active) {
         display.print("Temperatur: ");
-        display.print(bme280.readTemperature());
+        display.print(sensor_readings.temperature);
         display.println(" *C");
         display.print("Luftfeuchte: ");
-        display.print(bme280.readHumidity());
+        display.print(sensor_readings.humidity);
         display.println(" %");
         display.print("Luftdruck:");
-        display.print(bme280.readPressure() / 100.0F);
+        display.print(sensor_readings.pressure / 100.0F);
         display.println(" hPa");
-      } else if (bme680_active) {
-        if (! bme680.performReading()) {
-          Serial.println("Failed to perform reading :(");
       }
-        display.print("Temperatur: ");
+      if (bme680_active) {
-        display.print(bme680.readTemperature());
-        display.println(" *C");
-        display.print("Luftfeuchte: ");
-        display.print(bme680.readHumidity());
-        display.println(" %");
-        display.print("Luftdruck: ");
-        display.print(bme680.readPressure() / 100.0F);
-        display.println(" hPa");
         display.print("Gas: ");
-        display.print(bme680.gas_resistance / 1000.0);
+        display.print(sensor_readings.voc / 1000.0);
         display.println(" KOhms");
-      } else {
+      }
+      if (!bme280_active && !bme680_active) {
         display.print("Temperatur: ");
         float esp32_temperature = (temprature_sens_read() - 32) / 1.8;
         display.println(esp32_temperature-29.40);
-        display.println("kein BME280");
+        display.println("kein BME Sensor");
       }
 
       char timeStr[9];
@@ -402,11 +397,10 @@ void loop()
     while (display.nextPage());
     display.powerOff();
 
-  }
-
     printValues();
     sendValues();
 
+  }
 
   if(wifiMulti.run() != WL_CONNECTED) {
     Serial.println("WiFi not connected!");