Refactor the moisture prints into the main file.

src/capacitiveSoilMoistureSensor.cpp

@@ -19,7 +19,7 @@ void setupCapacitiveSoilMoistureSensor() {
   }
 }
 
-void loopCapacitiveSoilMoistureSensor() {
+int loopCapacitiveSoilMoistureSensor() {
   // subtract the last reading:
   total = total - readings[readIndex];
   // read from the sensor:
@@ -37,5 +37,6 @@ void loopCapacitiveSoilMoistureSensor() {
 
   // calculate the average:
   average = total / numReadings;
-  Serial.println(average);
+  
+  return average;
 }

src/header.h

@@ -12,7 +12,7 @@ extern int meineVariable;
 
 // moisture
 extern void setupCapacitiveSoilMoistureSensor();
-extern void loopCapacitiveSoilMoistureSensor();
+extern int loopCapacitiveSoilMoistureSensor();
 
 // light
 extern void setupLightSensor();

src/main.cpp

@@ -16,6 +16,9 @@ void loop() {
   Serial.print(lxValue);
   Serial.println(" lx");
 
-  loopCapacitiveSoilMoistureSensor();
+  uint16_t mstValue = loopCapacitiveSoilMoistureSensor();
+  Serial.print("Soil moisture: ");
+  Serial.println(mstValue);
+
   delay(200);        // delay in between reads for stability
 }