diff --git a/main/esp32-sensornode_main.cpp b/main/esp32-sensornode_main.cpp
index bfc494c..c468c2b 100644
--- a/main/esp32-sensornode_main.cpp
+++ b/main/esp32-sensornode_main.cpp
@@ -1,5 +1,6 @@
 /*
- * ESP32 Environmental Sensor Node with SI7021s (Temp + Hum)
+ * ESP32 Environmental Sensor Node with SI7021 (Temp + Hum)
+ * (to be build with custom compiled ESP-IDF)
  *
  * copyright: Jannik Beyerstedt | https://jannikbeyerstedt.de | code@jannikbeyerstedt.de
  * license: http://www.gnu.org/licenses/gpl-3.0.txt GPLv3 License
@@ -8,8 +9,8 @@
 #include "Arduino.h"
 
 #include "si7021.hpp"
-#include <WiFi.h>
 #include <driver/adc.h>
+#include <WiFi.h>
 
 #define BOARD_HUZZAH 1 /* Adafruit Feather HUZZAH */
 #define BOARD_LOLIN 2  /* LoLin NodeMCU */
@@ -17,9 +18,9 @@
 #define BOARD_ESP32 4  /* standalone ESP32 */
 
 /* DEBUG SETTINGS */
-#define TEST        /* use test config and database */
-#define PRINT_INFO  /* enable Serial output */
-#define PRINT_DEBUG /* enable additional debug output */
+#define TEST       /* use test config and database */
+#define PRINT_INFO /* enable Serial output */
+// #define PRINT_DEBUG /* enable additional debug output */
 
 /* CONFIGURATION OPTIONS */
 #ifndef NODENAME
@@ -27,15 +28,15 @@
 #endif
 
 #ifndef BOARD
-#define BOARD 4 /* IMPORTANT: select one of the BOARD_* types */
+#define BOARD 0 /* IMPORTANT: select one of the BOARD_* types */
 #endif
 
 #define DB_HOSTNAME "ursaminor.fra80"
 #define DB_PASSWD "c2Vuc29yczpTZW5zb3JzLXcuaW5mbHV4QGhvbWU"  // BasicAuth String
 
 #if BOARD == BOARD_ESP32
-#define BATT_FULL 3600    // 3.6V VCC (4.3V Battery) TODO: get actual value
-#define BATT_CUTOFF 2300  // 2.3V VCC (3.0V Battery) TODO: get actual value
+#define BATT_FULL 3600   // 3.6V VCC (4.3V Battery) TODO: get actual value
+#define BATT_CUTOFF 200  // 2.3V VCC (3.0V Battery) TODO: get actual value
 #else
 #error "unsupported board chosen"
 #endif
@@ -266,7 +267,7 @@ extern "C" void app_main() {
       WiFi.disconnect(true);
       // continue with deep sleep at end of main function
 
-    } else {  // ELSE: !wifiConnect
+    } else {  // ELSE: !wlanConnect
 
       /* WIFI CONNECT FAILED, WAIT MAX 5 MINUTES IN DEEP SLEEP */
       wlanConnectFailCnt++;
@@ -279,12 +280,13 @@ extern "C" void app_main() {
       } else {
         doDeepSleep(sampleInterval_sec);
       }
-    }  // ENDIF: wifiConnect
+    }  // ENDIF: wlanConnect
 
   } else {  // ELSE: sampleCnt < sampleAvgNum
 
 #ifdef PRINT_INFO
-    Serial.printf("[INFO ] %d of %d samples collected -> sleep\n", sampleCnt, sampleAvgNum);
+    Serial.printf("[INFO ] %d of %d samples collected -> sleep %4d s\n", sampleCnt, sampleAvgNum,
+                  sampleInterval_sec);
     // continue with deep sleep at end of main function
 #endif