diff --git a/main/station_example_main.c b/main/station_example_main.c
index 34cc204..12d8252 100755
--- a/main/station_example_main.c
+++ b/main/station_example_main.c
@@ -24,7 +24,7 @@
 
 #define SERVER_URL "http://192.168.178.157:8080/data"
 
-#define NUM_MEASUREMENTS 100000
+#define NUM_MEASUREMENTS 20000
 
 #define CHANNEL ADC_CHANNEL_6
 #define CALIBRATION_FACTOR 1600.0f
@@ -137,8 +137,10 @@ static void adc_init(void)
     }
 }
 
-const double upper = 0.24107260247486464 * CALIBRATION_FACTOR + CALIBRATION_FACTOR;
-const double lower =  -0.2247819992266048 * CALIBRATION_FACTOR + CALIBRATION_FACTOR;
+ 
+const double upper = 1931.009445512987;
+const double lower = 1371.4123048766235;
+const double nominal_v = 230.0;
 
 static float read_voltage(void)
 {
@@ -148,8 +150,8 @@ static float read_voltage(void)
         ESP_ERROR_CHECK(adc_cali_raw_to_voltage(cali_handle, raw, &mv));
     }
 
-    return (float)mv; 
-    // return (mv - lower) / (upper - lower) * 2.0 * 325.0 - 325.0;
+    // return (float)mv; 
+    return (mv - lower) / (upper - lower) * 2.0 * nominal_v - nominal_v;
 }
 
 /* ===================== HTTP ===================== */