1.2

src/battery_utils.cpp

@@ -1,13 +1,12 @@
 #include "battery_utils.h"
 #include "pins_config.h"
 
-extern String   batteryVoltage;
-
-float adcReadingTransformation = (4095/3.3);
+float adcReadingTransformation = (3.3/4095);
+float voltageDividerCorrection = 0.288;
 
 namespace BATTERY_Utils {
 
-String checkVoltages() {
+float checkVoltages() { 
     float sample;
     int sampleSum = 0;
     for (int i=0; i<100; i++) {
@@ -15,8 +14,7 @@ String checkVoltages() {
         sampleSum += sample;
         delayMicroseconds(50); 
     }
-    batteryVoltage = 2.1571 *(sampleSum/100) * adcReadingTransformation;
-    return String(batteryVoltage);
+    return (2 * (sampleSum/100) * adcReadingTransformation) + voltageDividerCorrection;
 }
 
 }