2024-10-1502

platformio.ini

@@ -19,8 +19,7 @@ lib_deps =
     bodmer/TFT_eSPI @ 2.5.43
     paulstoffregen/XPT2046_Touchscreen @ 0.0.0-alpha+sha.26b691b2c8
     adafruit/Adafruit Unified Sensor @ 1.1.14
-    #adafruit/Adafruit HTU21DF Library @ 1.0.5
+    adafruit/DHT sensor library @ 1.4.6
-    milesburton/DallasTemperature @ 3.11.0
 
 build_flags = ${env.build_flags}
     -DKorrekturTemperatur=0.0

src/main.cpp

@@ -27,6 +27,11 @@ TFT_eSPI tft = TFT_eSPI();       // Invoke custom library
 
 #define TFT_GREY 0x5AEB
 
+#include <Adafruit_Sensor.h>
+#include <DHT.h>
+#include <DHT_U.h>
+#define DHTPIN     22 
+#define DHTTYPE    DHT22 
 
 float ltx = 0;    // Saved x coord of bottom of needle
 uint16_t osx = M_SIZE*120, osy = M_SIZE*120; // Saved x & y coords
@@ -38,6 +43,10 @@ int value[6] = {0, 0, 0, 0, 0, 0};
 int old_value[6] = { -1, -1, -1, -1, -1, -1};
 int d = 0;
 
+DHT_Unified dht(DHTPIN, DHTTYPE);
+
+uint32_t delayMS;
+
 void analogMeter();
 void plotNeedle(int value, byte ms_delay);
 
@@ -46,17 +55,36 @@ void setup(void) {
   tft.init();
   tft.setRotation(1);
   Serial.begin(115200); // For debug
+  dht.begin();
+  Serial.println(F("DHTxx Unified Sensor Example"));
+  // Print temperature sensor details.
+  sensor_t sensor;
+  dht.temperature().getSensor(&sensor);
+  /* Serial.println(F("------------------------------------"));
+  Serial.println(F("Temperature Sensor"));
+  Serial.print  (F("Sensor Type: ")); Serial.println(sensor.name);
+  Serial.print  (F("Driver Ver:  ")); Serial.println(sensor.version);
+  Serial.print  (F("Unique ID:   ")); Serial.println(sensor.sensor_id);
+  Serial.print  (F("Max Value:   ")); Serial.print(sensor.max_value); Serial.println(F("°C"));
+  Serial.print  (F("Min Value:   ")); Serial.print(sensor.min_value); Serial.println(F("°C"));
+  Serial.print  (F("Resolution:  ")); Serial.print(sensor.resolution); Serial.println(F("°C"));
+  Serial.println(F("------------------------------------")); */
+  // Print humidity sensor details.
+  dht.humidity().getSensor(&sensor);
+  /* Serial.println(F("Humidity Sensor"));
+  Serial.print  (F("Sensor Type: ")); Serial.println(sensor.name);
+  Serial.print  (F("Driver Ver:  ")); Serial.println(sensor.version);
+  Serial.print  (F("Unique ID:   ")); Serial.println(sensor.sensor_id);
+  Serial.print  (F("Max Value:   ")); Serial.print(sensor.max_value); Serial.println(F("%"));
+  Serial.print  (F("Min Value:   ")); Serial.print(sensor.min_value); Serial.println(F("%"));
+  Serial.print  (F("Resolution:  ")); Serial.print(sensor.resolution); Serial.println(F("%"));
+  Serial.println(F("------------------------------------")); */
+  // Set delay between sensor readings based on sensor details.
+  delayMS = sensor.min_delay / 1000;
   tft.fillScreen(TFT_BLACK);
   tft.drawString("Raumfeuchtigkeit", 1, 210, 4);
-  //I2C_2.begin(SDA_2, SCL_2, I2C_FREQ);
-  //delay(9000);
-
   
 
- 
-
-  //delay(10000);
-
   analogMeter(); // Draw analogue meter
 
   updateTime = millis(); // Next update time
@@ -69,13 +97,36 @@ void setup(void) {
 
 void loop() {
   float Temperatur;
+  delay(delayMS);
+  // Get temperature event and print its value.
+  sensors_event_t event;
+  dht.temperature().getEvent(&event);
+  if (isnan(event.temperature)) {
+    Serial.println(F("Error reading temperature!"));
+  }
+  else {
+    Serial.print(F("Temperature: "));
+    Temperatur = event.temperature;
+    Serial.print(Temperatur);
+    Serial.println(F("°C"));
+  }
+  // Get humidity event and print its value.
+  dht.humidity().getEvent(&event);
+  if (isnan(event.relative_humidity)) {
+    Serial.println(F("Error reading humidity!"));
+  }
+  else {
+    Serial.print(F("Humidity: "));
+    Serial.print(event.relative_humidity);
+    Serial.println(F("%"));
+  }
   if (updateTime <= millis()) {
     updateTime = millis() + 5000; // Update meter every 35 milliseconds
  
     // Create a Sine wave for testing
     d += 4; if (d >= 360) d = 0;
-    value[0] = 50 + 50 * sin((d + 0) * 0.0174532925);
+    //value[0] = 50 + 50 * sin((d + 0) * 0.0174532925);
-    
+    value[0] = event.relative_humidity;
    
     plotNeedle(value[0], 0); // It takes between 2 and 12ms to replot the needle with zero delay
     tft.fillRect(0, 179, 310, 60, TFT_GREEN);
@@ -86,7 +137,7 @@ void loop() {
       tft.drawString("o", 212, 180, 1);
       tft.drawString("C", 220, 180, 4);
       tft.drawString("Raumfeuchtigkeit:", 1, 210, 4);
-      char buf[8]; dtostrf(value[0], 3, 0, buf);
+      char buf[8]; dtostrf(event.relative_humidity, 3, 0, buf);
       tft.drawString(buf, 230, 210, 4);
       tft.drawString("%", 270, 210, 4);
     }
@@ -187,7 +238,7 @@ void analogMeter()
     if (i < 50) tft.drawLine(x0, y0, x1, y1, TFT_BLACK);
   }
 
-  tft.drawString("%", M_SIZE*(5 + 230 - 40), M_SIZE*(119 - 20), 2); // Units at bottom right
+  //tft.drawString("%", M_SIZE*(5 + 230 - 40), M_SIZE*(119 - 20), 2); // Units at bottom right
   tft.drawCentreString("%", M_SIZE*120, M_SIZE*70, 4); // Comment out to avoid font 4
   tft.drawRect(5, 3, M_SIZE*230, M_SIZE*119, TFT_BLACK); // Draw bezel line
 
@@ -205,7 +256,7 @@ void plotNeedle(int value, byte ms_delay)
 {
   tft.setTextColor(TFT_BLACK, TFT_WHITE);
   char buf[8]; dtostrf(value, 4, 0, buf);
-  tft.drawRightString(buf, M_SIZE*40, M_SIZE*(119 - 20), 2);
+  //tft.drawRightString(buf, M_SIZE*40, M_SIZE*(119 - 20), 2);
 
   if (value < -10) value = -10; // Limit value to emulate needle end stops
   if (value > 110) value = 110;