 // OLED Display
 #include <SPI.h>
 #include <Wire.h>
-//#include <Adafruit_GFX.h>
+#include <Adafruit_GFX.h>
 #include <Adafruit_SSD1306.h>
 
 #define OLED_RESET 4

    byte i;
    //Serial.println(F("check if hum"));
    if ((float)(get_hum() <= 65.0 || get_hum() <= 70.0)) {
      if (!isopen) {
        //oeffne die Belueftung und starte den Luefter
        Serial.println(F("Switch fan on"));
        servo_ctrl("open");
      }
    } else {
      if (isopen) {
        // switch fan1 off und schliesse den Schlitz
        Serial.println(F("Switch fan off"));
        servo_ctrl("close");
      }
    }
    task2 = millis();

 * A5  = I2C OLED Display (SCL)
 * ---
 * D5  = (PWM) Servo Motor
 * ---
 * D7  = LED (Power)
 * D8  = LED (Activity)
 * ---
 * 
 * OLED Display SSD1306:
