diff --git a/embadet/main/apple.c b/embadet/main/apple.c
index 421a618..274226e 100644
--- a/embadet/main/apple.c
+++ b/embadet/main/apple.c
@@ -1,53 +1,54 @@
 #include "apple.h"
 
-
 int app_main() {
+    // Fill struct
+    struct appledata send;
+    getmac(send.mac);
+    send.upTime = getUpTime();
+    send.temp = getTemp();
+    send.batteryVoltage = 3.3;
 
-  //fill struct
-  struct appledata send;
-  getmac(send.mac) ;
-  send.upTime = getUpTime(); 
-  send.temp = getTemp();
-  send.battaryVoltage = 3.3;
+    printf("Hello \n");
+    printf("%d\n", send.upTime);
+    printf("%.4f\n", send.temp);
 
-  printf("%.4f",send.temp);
-
-  //end func
-  return 0;
+    // End function
+    return 0;
 }
 
-
-void getmac(uint8_t *buf){
-  // Get MAC address of the WiFi station interface
-  esp_read_mac(buf, ESP_MAC_WIFI_STA);
+void getmac(uint8_t *buf) {
+    // Get MAC address of the WiFi station interface
+    esp_read_mac(buf, ESP_MAC_WIFI_STA);
 }
 
-int getUpTime(){
-    int uptime = (xTaskGetTickCount() * (1000/configTICK_RATE_HZ));
-
+int getUpTime() {
+    // Get system uptime in milliseconds
+    uint32_t uptime = (xTaskGetTickCount() * (1000 / configTICK_RATE_HZ));
     return uptime;
 }
 
 float getTemp() {
-    float temp = 0;
-    // Create variable for handler
+    float temp = 0.0;
     ds18b20_handler_t sensor;
 
-    // Check for any initialization failures
-    if (!ds18b20_init(&sensor, GPIO_NUM_2, TEMP_RES_12_BIT))        
-    {
-    ESP_LOGE("TAG", "Failed to initalize DS18B20!");
-    return 0; // Exit
-    } 
-    //Print temperature with 4 decimal places 
-    // (12 bit resolution measurement accuracy is 0.0625 Celsius)
-    //ESP_LOGI("TAG", "Temperature = %.4f", temp);
-    // Initalize conversion
-    ds18b20_convert_temp(&sensor);
-    temp = ds18b20_read_temp(&sensor);
-    
-    return temp;
+    // Initialize DS18B20 sensor
+    if (!ds18b20_init(&sensor, GPIO_NUM_2, TEMP_RES_12_BIT)) {
+        ESP_LOGE("DS18B20", "Failed to initialize DS18B20 sensor!");
+        return -1.0; // Indicate an error with a negative value
+    }
 
+    // Convert temperature
+    ds18b20_convert_temp(&sensor);
+
+    // Read the temperature
+    temp = ds18b20_read_temp(&sensor);
+
+    // Check if the temperature is within a reasonable range for DS18B20
+    if (temp < -55.0 || temp > 125.0) {
+        ESP_LOGE("DS18B20", "Temperature reading out of range: %.2f", temp);
+        return -1.0; // Indicate invalid reading
+    }
+
+    return temp;
 }
 
-
diff --git a/embadet/main/apple.h b/embadet/main/apple.h
index 47fd72b..b044f69 100644
--- a/embadet/main/apple.h
+++ b/embadet/main/apple.h
@@ -5,22 +5,22 @@
 #include <stdio.h>
 #include <time.h>
 #include <onewire.h>
-#include <ds18b20.h>  // Die Header-Datei mit DS18B20-Funktionen
+#include <ds18b20.h>
 #include <task.h>
 #include <esp_wifi.h>
 #include <FreeRTOSConfig.h>
+#include <stdint.h> // Include for uint8_t
 
-
-struct appledata{
+struct appledata {
     uint8_t mac[6];
     float temp;
-    float battaryVoltage;
-    int upTime;
+    float batteryVoltage; // Corrected spelling
+    uint32_t upTime; // Use uint32_t for uptime
 };
 
+// Function declarations
 float getTemp();
 int getUpTime();
 void getmac(uint8_t *buf);
 
-
-#endif
\ No newline at end of file
+#endif // APPLE_H