diff --git a/include/CO2.h b/include/CO2.h
index 43b5c68..709e265 100644
--- a/include/CO2.h
+++ b/include/CO2.h
@@ -2,6 +2,8 @@
 
 #include <HardwareSerial.h>
 
+#include <Wire.h>
+
 HardwareSerial Co2Port(1); // use UART2
 
 // co2 Grenzwerte
diff --git a/src/main.cpp b/src/main.cpp
index 47ce8f6..80d0e07 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -21,8 +21,8 @@
 
 #include <CO2.h>
 
-#define SDA 22
-#define SDL 21
+#define I2C_SDA 17
+#define I2C_SCL 2
 
 
 // Pins for LED MATRIX
@@ -78,7 +78,7 @@ Adafruit_HTU21DF htu = Adafruit_HTU21DF();
 
 // This defines the 'on' time of the display is us. The larger this number,
 // the brighter the display. If too large the ESP will crash
-uint8_t display_draw_time=10; //30-70 is usually fine
+uint8_t display_draw_time = 35; //30-70 is usually fine
 
 //PxMATRIX display(32,16,P_LAT, P_OE,P_A,P_B,P_C);
 PxMATRIX display(64,32,P_LAT, P_OE,P_A,P_B,P_C,P_D);
@@ -101,13 +101,6 @@ uint16_t myHimmelblau = display.color565(0, 191, 255);
 
 uint16_t myCOLORS[8]={myRED,myGREEN,myBLUE,myWHITE,myYELLOW,myCYAN,myMAGENTA,myBLACK};
 
-//------- Helligkeit des Display -------
-uint8_t dunkel = 25;
-uint8_t hell = 255;
-//---- Zeitsteuerung der Helligkeit ----
-u_int16_t StartderAbdunklung = 20;
-u_int16_t EndederAbdunklung = 7;
-
 // Wifi
 char ssid[] = "MagentaWLAN-RGDO";          // your network SSID (name)
 char pass[] = "93329248424922704583";               // your network password
@@ -667,11 +660,12 @@ void Test()
 void setup() {
   startTime = millis();
   Serial.begin(115200);
+  //Wire.begin(I2C_SDA, I2C_SCL);
   beginC02();
-  if (!htu.begin()) {
+  if (!htu.begin()){
     Serial.println("Couldn't find sensor!");
     NOHTU = true;
-    delay(500);
+    delay(5000);
 
   }
   readHtu();