diff --git a/ESP32/TempHumLoggerHomeKit/TempHumLoggerHomeKit.ino b/ESP32/TempHumLoggerHomeKit/TempHumLoggerHomeKit.ino
index 749ef07..8dfd491 100644
--- a/ESP32/TempHumLoggerHomeKit/TempHumLoggerHomeKit.ino
+++ b/ESP32/TempHumLoggerHomeKit/TempHumLoggerHomeKit.ino
@@ -806,7 +806,8 @@ void loop() {
       file.print(" V:  ");
       file.println(formatNumber(currentBatteryVoltage, 2));
       file.close();
-      delay(850);
+      esp_sleep_enable_timer_wakeup(85 * 1000ULL); // 5s w mikrosekundach
+      esp_light_sleep_start();
     }
   }
 
@@ -864,13 +865,16 @@ void loop() {
       file.println(formatNumber(humLCalc));
       file.close();
       delay(1000);
+      esp_sleep_enable_timer_wakeup(1 * 1000000ULL); // 1s
+      esp_light_sleep_start();
     }
   }
   if (sd_error == 1){
     display.drawLine(0, 0,128, 32, SSD1306_WHITE);
   }
   display.display();
-  delay(150);
+  esp_sleep_enable_timer_wakeup(15 * 10000ULL); // 150ms
+  esp_light_sleep_start();
   yield();
 }