change radioactivity conversion

src/main.cpp

@@ -77,8 +77,8 @@ static constexpr uint8_t SDS_TX = D1;
 static constexpr uint8_t SDS_RX = D2;
 
 static constexpr uint8_t GEIGER_PIN = D6;
-static constexpr float CONV_FACTOR = 0.008120 / 2.5;
+static constexpr float CONV_FACTOR = 0.008120;
-static constexpr float OWN_BACKGROUND_CPS = 0;  // documentation says 0.2 (make sure value doesn't get negative if subtracting!)
+static constexpr float OWN_BACKGROUND_CPS = 0.2;  // documentation says 0.2 (make sure value doesn't get negative if subtracting!)
 
 #ifndef EXTERNAL_POWER
 ADC_MODE(ADC_VCC);