diff --git a/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.fzz b/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.fzz
new file mode 100644
index 0000000..f31fc64
Binary files /dev/null and b/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.fzz differ
diff --git a/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.ino b/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.ino
index c5b1f0e..d03c3b5 100644
--- a/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.ino
+++ b/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.ino
@@ -1,35 +1,31 @@
 /*  Klingel-Sensor auf Arduino Nano ATmega168
  * 
  *  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Button
- *  https://elektro.turanis.de/html/prj035/index.html
- * 
- *  D2  -------------
- *          |       |
- *        10kOhm    |
- *          |       |
- *  +5V -----       |
- *                Button
- *                  |
- *  GND -------------
+ *  https://docs.arduino.cc/tutorials/generic/digital-input-pullup/
  */
 
+
 const int ledPin = LED_BUILTIN;
 const int buttonPin = 2; // Button connected to D2
 const int flare_threshold = 200;
 const int ring_delay = 250;
 
+
 bool active = false;
 
+
 void setup() {
   pinMode(ledPin, OUTPUT);
-  pinMode(buttonPin, INPUT);
+  pinMode(buttonPin, INPUT_PULLUP);
   Serial.begin(9600);
   Serial.println("Doorbell sensor");
 }
 
+
 void loop() {
   int val = digitalRead(buttonPin);
 
+
   if (val == LOW) {
     delay(flare_threshold); // catch flares
     val = digitalRead(buttonPin);
@@ -45,8 +41,10 @@ void loop() {
       Serial.print(flare_threshold);
       Serial.println(")");
     }
-  } else {
+  }
+  else {
     digitalWrite(ledPin, LOW);
     active = false;
   }
 }
+
diff --git a/garage/garage_esp32/garage_esp32.fzz b/garage/garage_esp32/garage_esp32.fzz
index 2ea669a..14d22d2 100644
Binary files a/garage/garage_esp32/garage_esp32.fzz and b/garage/garage_esp32/garage_esp32.fzz differ
diff --git a/garage/garage_esp32/garage_esp32.ino b/garage/garage_esp32/garage_esp32.ino
index 4efb36d..b002ca0 100644
--- a/garage/garage_esp32/garage_esp32.ino
+++ b/garage/garage_esp32/garage_esp32.ino
@@ -2,6 +2,8 @@
     Sources:
     https://randomnerdtutorials.com/esp32-esp8266-web-server-physical-button/
     https://randomnerdtutorials.com/esp32-pushover-notifications-arduino/
+
+    Note: Usage of wifi blocks the ADC2 analog pins. ADC1 pins can be used. See https://github.com/espressif/arduino-esp32/issues/102#issuecomment-295272351
 */
 
 #include <WiFi.h>
@@ -55,7 +57,7 @@ const int PIN_SPRINKLER1 = 25;        // relais pin for sprinkler 1
 const int PIN_SPRINKLER2 = 33;        // relais pin for sprinkler 2
 const int PIN_SPRINKLER3 = 32;        // relais pin for sprinkler 3
 const int PIN_SPRINKLER4 = 26;        // relais pin for sprinkler 4
-const int PIN_MOISTURE_ANALOG = 14;   // moisture sensor analog value  // XXX currently blocked by WiFi
+const int PIN_MOISTURE_ANALOG = 35;   // moisture sensor analog value
 const int PIN_MOISTURE_DIGITAL = 27;  // moisture sensor digital value
 
 AsyncWebServer server(80);