diff --git a/sodaq_one/nico.ino b/sodaq_one/nico.ino
index 6fe84cf..4ee97fd 100644
--- a/sodaq_one/nico.ino
+++ b/sodaq_one/nico.ino
@@ -1,8 +1,11 @@
 #include <Arduino.h>
 
-
+#define ADC_AREF 3.3f
+#define BATVOLT_R1 2.0f
+#define BATVOLT_R2 2.0f
+#define BATVOLT_PIN BAT_VOLT
 
 int getB()
 {
-    return (float)analogRead(BAT_VOLT);
+    return ((ADC_AREF / 1.023) * (BATVOLT_R1 + BATVOLT_R2) / BATVOLT_R2 * (float)analogRead(BATVOLT_PIN));
 }