diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6724578
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+KiCad/CanGrow/CanGrow-backups
diff --git a/Arduino/CanGrow/CanGrow.ino b/Arduino/CanGrow/CanGrow.ino
index 053abc9..024bf86 100644
--- a/Arduino/CanGrow/CanGrow.ino
+++ b/Arduino/CanGrow/CanGrow.ino
@@ -116,11 +116,11 @@ int getWaterlevel() {
  
   // enable Vcc for water level sensor
   digitalWrite(PINwater, HIGH);
-  // wait a bit to let the schematic "settle in"
+  // wait a bit to let the circuit stabilize
   delay(200);
   // get the value
   waterlevelRAW = analogRead(PINAwater);
-  // disable Vcc for the sensor (in case of chemical reactions of the probes)
+  // disable Vcc for the sensor to prevent electrolysis effect
   digitalWrite(PINwater, LOW);
 
   if( waterlevelRAW >= waterlevelOK) {
diff --git a/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-29_211804.zip b/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-29_211804.zip
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diff --git a/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-31_012949.zip b/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-31_012949.zip
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diff --git a/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-31_043640.zip b/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-31_043640.zip
deleted file mode 100644
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diff --git a/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-31_044451.zip b/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-31_044451.zip
deleted file mode 100644
index f109399..0000000
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diff --git a/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-31_045318.zip b/KiCad/CanGrow/CanGrow-backups/CanGrow-2024-03-31_045318.zip
deleted file mode 100644
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diff --git a/KiCad/CanGrow/CanGrow.kicad_sch b/KiCad/CanGrow/CanGrow.kicad_sch
index 8996512..6501899 100644
--- a/KiCad/CanGrow/CanGrow.kicad_sch
+++ b/KiCad/CanGrow/CanGrow.kicad_sch
@@ -3156,6 +3156,16 @@
 		)
 		(uuid "ffca93ab-b7c3-4700-b47f-27eae3d79c02")
 	)
+	(text "Pin A0"
+		(exclude_from_sim no)
+		(at 109.474 127.508 0)
+		(effects
+			(font
+				(size 1.27 1.27)
+			)
+		)
+		(uuid "39e00273-5e15-4d2a-a28b-3cc82f788021")
+	)
 	(text "1 - GND\n2 - VCC\n3 - SDL\n4 - SDA"
 		(exclude_from_sim no)
 		(at 226.314 50.292 0)
@@ -3166,6 +3176,16 @@
 		)
 		(uuid "7689a88c-af3d-4840-bb58-6e6681a3a179")
 	)
+	(text "Pin D4"
+		(exclude_from_sim no)
+		(at 109.474 112.268 0)
+		(effects
+			(font
+				(size 1.27 1.27)
+			)
+		)
+		(uuid "775809ed-2a46-4309-b3e6-c2542e0c428d")
+	)
 	(text "1 - OK\n2 - WARN\n3 - CRIT"
 		(exclude_from_sim no)
 		(at 53.594 133.35 0)