Aktiviere DHT22

include/config.h

@@ -28,3 +28,18 @@
 // Anzahl der angeschlossenen LEDs am Ring
 #define NUMPIXELS 8
 
+// ######## DHT Temperatur Sensor ########
+
+// Kommentiere enable_DHT aus um das laden zu deaktivieren
+#define enable_DHT
+
+// Pins für Temperatursensor DHT22
+#define DHT_PIN 18
+// DHT22 Typ
+#define DHT_TYPE DHT22
+//#define DHT_TYPE DHT11   // DHT 11
+//#define DHT_TYPE DHT22   // DHT 22  (AM2302), AM2321
+//#define DHT_TYPE DHT21   // DHT 21 (AM2301)
+
+// DHT Sensor Wartezeit zwischen messungen
+unsigned long sampletime_ms = 10000; // 10 Sekunden

include/dht_sensor.h

@@ -0,0 +1,50 @@
+#include "DHT.h"
+
+#ifndef DHT_PIN
+  #define DHT_PIN 18
+#endif
+#ifndef DHT_TYPE
+  #define DHT_TYPE DHT22
+#endif
+
+String dht_s_temperature;
+String dht_s_humidity;
+String dht_s_hic;
+
+DHT dht(DHT_PIN, DHT_TYPE);
+String Float2String(float value)
+{
+  // Convert a float to String with two decimals.
+  String s;
+  s = String(int(value));
+  s += '.';
+  s += int((value - int(value)) * 100);
+
+  return s;
+}
+
+void sensorDHT(){
+  String data;
+  float h = dht.readHumidity();
+  float t = dht.readTemperature();
+
+  // check if Not a Number
+  if (isnan(t) || isnan(h)) {
+    Serial.println("DHT Sensordaten konnten nicht gelesen werden");
+  } else {
+    //false = Celcius | true = Farenheit
+    float hic = dht.computeHeatIndex(t, h, false);
+    dht_s_temperature=Float2String(t);
+    dht_s_humidity=Float2String(h);
+    dht_s_hic=Float2String(hic);
+    Serial.print("Luftfeuchte: ");
+    Serial.print(dht_s_humidity);
+    Serial.print(" %\n");
+    Serial.print("Temperatur: ");
+    Serial.print(dht_s_temperature);
+    Serial.print(" °C\n");
+    Serial.print("Gefühlte Temperatur: ");
+    Serial.print(dht_s_hic);
+    Serial.print(" °C\n");
+  }
+}

platformio.ini

@@ -17,5 +17,7 @@ lib_deps =
 	squix78/ESP8266 and ESP32 OLED driver for SSD1306 displays @^4.2.0
 	yiannisbourkelis/Uptime Library @ ^1.0.0
 	wifwaf/MH-Z19@^1.5.3
+	adafruit/DHT sensor library@^1.4.1
+	adafruit/Adafruit Unified Sensor@^1.1.4
 monitor_speed = 115200
 upload_speed = 921600

src/ebk_co2ampel.cpp

@@ -7,6 +7,9 @@
 #include <Preferences.h>
 #include "uptime_formatter.h"
 
+#ifdef enable_DHT
+  #include "dht_sensor.h"
+  long lastMsg = 0;
 #endif
 
 
@@ -85,6 +88,10 @@ void setup() {
   Serial.println("Starte...");
   Serial.print("CO2-Ampel Firmware: ");Serial.println(ampelversion);
 
+#ifdef enable_DHT
+  dht.begin();
+#endif
+
   // Ab hier Bootmodus initialisieren und festlegen
   preferences.begin("co2", false);
   currentBootMode = preferences.getUInt("cal", BOOT_UNKNOWN);  // Aktuellen Boot-Mode lesen und speichern
@@ -309,5 +316,10 @@ void loop() {
       if(currentBootMode == BOOT_NORMAL) { set_led_color(co2); }
     }
   }
+  long now = millis();
+  if (now - lastMsg > sampletime_ms) {
+    lastMsg = now;
+    sensorDHT();  // Temperatur, gefühlte Temperatur und Luftfeuchte
+   }
 }