rtfm ...

src/arduinoNano/arduinoNano.ino

@@ -1,6 +1,9 @@
 #include <avr/sleep.h>
 
 
+const int dry = 459; // value for dry sensor
+const int wet = 214; // value for wet sensor
+
 float dampPotty;
 float onTimePotty;
 float solDampness;
@@ -24,6 +27,7 @@ void setup() {
 
 // the loop function runs over and over again forever
 void loop() {
+  Serial.print("Licht Sensor");
   Serial.println(digitalRead(2));
   delay(20);
   bedTimeYet();
@@ -48,7 +52,8 @@ float calculatePumpOnTime() {
 
 float calculateDampness() {
   solDampness = analogRead(A0);
-  return solDampness / 500;
+  float percentageHumididy = map(solDampness, wet, dry, 100, 0)/100;
+  return percentageHumididy;
 }
 
 void sleep() {

src/calibrateSleep/calibrateSleep.ino

@@ -13,6 +13,7 @@ void loop() {
   delay(200);
   Serial.println(analogRead(A4));
   Serial.println(analogRead(A2));
+  Serial.print("Dampness Sensor: ");
   Serial.println(analogRead(A0));
   delay(1000);
 }