diff --git a/README.md b/README.md
index 227a97c..a228406 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Voici à titre indicatif le matériel utilisé et leur prix d'achat sur eBay int
 - DC-DC Converter Step Up 1-5V 500mA | 1,15€
 - 3,7V 600mAh LiPo Battery | 3,25€
 - RTC Module for Arduino | 1,55€
-- 3x 10k Ohm resistor + 1x 100k Ohm resistor + 1x 110 Ohm resistor | 0,10€
+- 3x 10k Ohm resistor + 1x 100k Ohm resistor + 1x 120 Ohm resistor | 0,10€
 - Right Angle Mini Slide Switch | 0,10€	
 - Cables | 3€
 - Plastic Electronics Project Box Enclosure DIY 27x60x100mm | 2,40€
diff --git a/Variometer.png b/Variometer.png
index 7896481..98810e3 100644
Binary files a/Variometer.png and b/Variometer.png differ
diff --git a/Variometer/Variometer.ino b/Variometer/Variometer.ino
index 1c67880..529cf0d 100644
--- a/Variometer/Variometer.ino
+++ b/Variometer/Variometer.ino
@@ -799,7 +799,7 @@ void menuChangeEvent(MenuChangeEvent changed)
 int readVccPercent()
 {
   //unsigned int raw_bat = analogRead(A0);
-  float real_bat = ((analogRead(A0) * (3.7 / 1024)) * 2);
+  float real_bat = 5 *analogRead(A0) / 1023; 
   average_vcc = average_vcc * 0.94 + real_bat * 0.06;
   return round((average_vcc - 1.5) * 100 / (3.7 - 1.5));
 }
@@ -881,6 +881,7 @@ void loop()
 	= (D2 * alt) - (D2 * Altitude) / (tim - tempo)²
 	= D2 * (alt - Altitude) / (tim - tempo)²
 	= ((tim - tempo) * (alt - Altitude)) / (tim - tempo)²
+
 	= (alt - Altitude) / (tim - tempo)
   */