diff --git a/include/htu21d.h b/include/htu21d.h
new file mode 100644
index 0000000..14c4522
--- /dev/null
+++ b/include/htu21d.h
@@ -0,0 +1,41 @@
+#include <Wire.h>
+#include <Adafruit_Sensor.h>
+//#include <Adafruit_I2CDevice.h>
+#include <Adafruit_HTU21DF.h>
+
+Adafruit_HTU21DF htu = Adafruit_HTU21DF();
+
+bool F_HTU_21D;
+float K_HTU= -0.00;
+
+struct {
+  char temperature[15] = {0};
+  char humity[15] = {0};
+} htuData;
+
+void init_HTU21(){
+    F_HTU_21D = false;
+    if (!htu.begin()) {
+        Serial.println("Couldn't find sensor HUT21D!");
+    
+    }else{
+        F_HTU_21D = true;
+        Serial.println("HUT21D gefunden");
+    }
+    
+}
+
+void read_HTU21D() {
+    float t = htu.readTemperature();
+    t = t + KorrekturTemperatur;
+    dtostrf(t,7,1,htuData.temperature);
+    float h = htu.readHumidity();
+    dtostrf(h,7,1,htuData.humity);
+    Serial.print("Temperature (HTU21D):\t");
+    Serial.print(htuData.temperature);
+    Serial.println(" °C");
+    Serial.print("Luftfeuchtigkeit:\t");
+    Serial.print(htuData.humity);
+    Serial.println(" %");
+
+}
diff --git a/platformio.ini b/platformio.ini
index 8d97eb8..e1aa506 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -19,3 +19,9 @@ lib_deps =
     # The exact version
     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
+
+build_flags = ${env.build_flags}
+    -DKorrekturTemperatur=0.0
+
diff --git a/src/main.cpp b/src/main.cpp
index 92f866c..365a884 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -15,6 +15,8 @@
 Updated by Bodmer for variable meter size
  */
 
+#define ledGreen 16
+
 // Define meter size as 1 for tft.rotation(0) or 1.3333 for tft.rotation(1)
 #define M_SIZE 1.3333
 
@@ -25,6 +27,7 @@ TFT_eSPI tft = TFT_eSPI();       // Invoke custom library
 
 #define TFT_GREY 0x5AEB
 
+
 float ltx = 0;    // Saved x coord of bottom of needle
 uint16_t osx = M_SIZE*120, osy = M_SIZE*120; // Saved x & y coords
 uint32_t updateTime = 0;       // time for next update
@@ -41,14 +44,19 @@ void plotNeedle(int value, byte ms_delay);
 void setup(void) {
   tft.init();
   tft.setRotation(1);
-  Serial.begin(57600); // For debug
+  Serial.begin(115200); // For debug
   tft.fillScreen(TFT_BLACK);
   tft.drawString("Raumfeuchtigkeit", 1, 210, 4);
+  //I2C_2.begin(SDA_2, SCL_2, I2C_FREQ);
   //delay(9000);
 
   analogMeter(); // Draw analogue meter
 
   updateTime = millis(); // Next update time
+  pinMode(ledGreen, OUTPUT);
+  analogWrite(ledGreen, 102);
+  //init_HTU21();
+  delay(5000);
 }
 
 
@@ -99,23 +107,29 @@ void analogMeter()
     int y3 = sy2 * M_SIZE*100 + M_SIZE*140;
 
     // Yellow zone limits
-    //if (i >= -50 && i < 0) {
-    //  tft.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_YELLOW);
-    //  tft.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_YELLOW);
-    //}
+    if (i >= -50 && i < 0) {
+      tft.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_YELLOW);
+      tft.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_YELLOW);
+    }
 
     // Green zone limits
-    if (i >= 0 && i < 25) {
+    if (i >= 0 && i < 15) {
       tft.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_GREEN);
       tft.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_GREEN);
     }
 
     // Orange zone limits
-    if (i >= 25 && i < 50) {
+    if (i >= 15 && i < 25) {
       tft.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_ORANGE);
       tft.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_ORANGE);
     }
 
+    // Red zone limits
+    if (i >= 25 && i < 50) {
+      tft.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_RED);
+      tft.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_RED);
+    }
+
     // Short scale tick length
     if (i % 25 != 0) tl = 8;