Problem with u8b2 and DHT Sensor, buffer deletes data

Other Hardware Displays
1 
#include <SimpleDHT.h>
#include <dht_nonblocking.h>
#include <U8g2lib.h>
#include <Wire.h>
#define DHT_SENSOR_TYPE DHT_TYPE_11

static const int DHT_SENSOR_PIN = 2;

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE);
DHT_nonblocking dht_sensor( DHT_SENSOR_PIN, DHT_SENSOR_TYPE );

void setup( )
{
  Serial.begin( 9600);
  u8g2.begin();
  
}

static bool measure_environment( float *temperature, float *humidity )
{
  static unsigned long measurement_timestamp = millis( );

  if( millis( ) - measurement_timestamp > 3000ul )
  {
    if( dht_sensor.measure( temperature, humidity ) == true )
    {
      measurement_timestamp = millis( );
      return( true );
    }
  }
  return( false );
}

void loop( )
{ 
  float temperature;
  float humidity;

  if( measure_environment( &temperature, &humidity ) == true )
  {
    Serial.print( "T = " );
    Serial.print( temperature, 1 );
    Serial.print( " deg. C, H = " );
    Serial.print( humidity, 1 );
    Serial.println( "%" ); 
   }
  u8g2.clearBuffer();
  u8g2_prepare();
  u8g2.drawStr(1, 0, "Hello");
  u8g2.sendBuffer();
}

void u8g2_prepare() {
 u8g2.setFont(u8g2_font_6x10_tf); 
 u8g2.setFontRefHeightExtendedText(); 
 u8g2.setDrawColor(1);
 u8g2.setFontPosTop();
 u8g2.setFontDirection(0);
}

void u8g2_display(){
  u8g2.drawStr(0, 0, "This is working");
}

I want to Display the data I get from the sensor (temperature and humidity) on a OCD Screen. This is what i've come up with, but its not working that well. If i dont comment the clear and sendBuffer, the data is deleted and i only get zeros. But if i comment them out, i cant display something on the display. Also i dont understand how i can display the float variables onto the display. Could someone explain to me why the data is being deleted?

2

This describes it pretty good, but im already using the suggested solution, but it is still not working

3

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