diff --git a/.travis.yml b/.travis.yml
index 5f5defe..66a5b06 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,20 +1,18 @@
 language: c
-sudo: false
+sudo: true
 cache:
-  directories:
-  - ~/arduino_ide
-  - ~/.arduino15/packages/
+   directories:
+   - ~/arduino_ide
+   - ~/.arduino15/packages/
 git:
-  depth: false
-  quiet: true
+   depth: false
+   quiet: true
 env:
-  global:
-  - PRETTYNAME="NeoPatterns Arduino Library"
+   global:
+   - PRETTYNAME="NeoPatterns Arduino Library"
+   - INSTALL_PLATFORMS="avr,esp8266,esp32,stm32"
 before_install:
-# Workaround for avoiding "fork/exec /bin/xtensa-lx106-elf-g++: no such file or directory"
-- echo "Removing ESP8266 cache"
-- rm -rf ~/.arduino15/packages/esp8266
-- source <(curl -SLs https://raw.githubusercontent.com/adafruit/travis-ci-arduino/master/install.sh)
+- source <(curl -SLs https://raw.githubusercontent.com/ArminJo/travis-ci-arduino/master/install.sh)
 install:
 - arduino --install-library "Adafruit NeoPixel"
 script:
@@ -25,8 +23,8 @@ script:
 - build_platform esp8266
 - build_platform esp32
 notifications:
-  email:
-    recipients:
+   email:
+      recipients:
       - armin.arduino@gmail.com
-    on_success: always
-    on_failure: always
\ No newline at end of file
+      on_success: always
+      on_failure: always
\ No newline at end of file
diff --git a/README.md b/README.md
index d3d599f..2adcd86 100644
--- a/README.md
+++ b/README.md
@@ -75,11 +75,14 @@ NeoPatterns on breadboard
 ![NeoPatterns on breadboard](https://github.com/ArminJo/NeoPatterns/blob/master/extras/Breadboard_complete.jpg)
 
 # Revision History
+### Version 2.2.0
+- Added OpenLedRace example.
+
 ### Version 2.1.0
 - Ported to ESP8266 and ESP32.
 - Changed signature of NeoPatterns(NeoPixel * aUnderlyingNeoPixelObject). Swapped 4. and 5. parameter to make it consistent to the NeoPixel signature.
-- Added OpenLedRace example.
 - Function `setPixelOffsetForPartialNeoPixel()` in NeoPixel.cpp added.
+
 ### Version 2.0.0
 - Rewrite of most patterns control logic.
 - Function `drawBar()` in NeoPixel.cpp added.
@@ -109,6 +112,8 @@ The NeoPatterns library examples are built on Travis CI for the following boards
 - Arduino Uno
 - Arduino Leonardo
 - Arduino Mega 2560
+- ESP8266 boards (tested with LOLIN D1 R2 board)
+- ESP32   boards (tested with ESP32 DEVKITV1 board)
 
 ## Requests for modifications / extensions
 Please write me a PM including your motivation/problem if you need a modification or an extension.
diff --git a/examples/AllPatternOnOneStrip/AllPatternOnOneStrip.ino b/examples/AllPatternOnOneStrip/AllPatternOnOneStrip.ino
index 174f7a1..39d0146 100644
--- a/examples/AllPatternOnOneStrip/AllPatternOnOneStrip.ino
+++ b/examples/AllPatternOnOneStrip/AllPatternOnOneStrip.ino
@@ -55,10 +55,16 @@ NeoPatterns bar16 = NeoPatterns(16, PIN_NEOPIXEL_BAR_16, NEO_GRB + NEO_KHZ800, &
 #endif
 
 void setup() {
+    pinMode(LED_BUILTIN, OUTPUT);
+
 #ifdef INFO
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
 #endif
diff --git a/examples/AllPatternsOnMultiDevices/AllPatternsOnMultiDevices.ino b/examples/AllPatternsOnMultiDevices/AllPatternsOnMultiDevices.ino
index 944a94a..e79de31 100644
--- a/examples/AllPatternsOnMultiDevices/AllPatternsOnMultiDevices.ino
+++ b/examples/AllPatternsOnMultiDevices/AllPatternsOnMultiDevices.ino
@@ -87,8 +87,12 @@ void setup() {
     pinMode(LED_BUILTIN, OUTPUT);
 
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
 
diff --git a/examples/MatrixDemo/MatrixDemo.ino b/examples/MatrixDemo/MatrixDemo.ino
index 5a90f16..6cc4b37 100644
--- a/examples/MatrixDemo/MatrixDemo.ino
+++ b/examples/MatrixDemo/MatrixDemo.ino
@@ -48,8 +48,12 @@ void setup() {
 	pinMode(LED_BUILTIN, OUTPUT);
 
 	Serial.begin(115200);
-	while (!Serial)
-		; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
 	// Just to know which program is running on my Arduino
 	Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
 
diff --git a/examples/MatrixShowAllColors/MatrixShowAllColors.ino b/examples/MatrixShowAllColors/MatrixShowAllColors.ino
index e2dbbb5..bf135cb 100644
--- a/examples/MatrixShowAllColors/MatrixShowAllColors.ino
+++ b/examples/MatrixShowAllColors/MatrixShowAllColors.ino
@@ -48,8 +48,12 @@ void setup() {
     pinMode(LED_BUILTIN, OUTPUT);
 
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
 
diff --git a/examples/MultiplePatternsOnOneBar/MultiplePatternsOnOneBar.ino b/examples/MultiplePatternsOnOneBar/MultiplePatternsOnOneBar.ino
index 4fb3f62..fa4998d 100644
--- a/examples/MultiplePatternsOnOneBar/MultiplePatternsOnOneBar.ino
+++ b/examples/MultiplePatternsOnOneBar/MultiplePatternsOnOneBar.ino
@@ -48,8 +48,12 @@ void setup() {
     pinMode(LED_BUILTIN, OUTPUT);
 
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from  " __DATE__));
 
diff --git a/examples/NeoPatternsSimpleDemo/NeoPatternsSimpleDemo.ino b/examples/NeoPatternsSimpleDemo/NeoPatternsSimpleDemo.ino
index a1d162f..895c3ed 100644
--- a/examples/NeoPatternsSimpleDemo/NeoPatternsSimpleDemo.ino
+++ b/examples/NeoPatternsSimpleDemo/NeoPatternsSimpleDemo.ino
@@ -40,8 +40,12 @@ NeoPatterns bar16 = NeoPatterns(16, PIN_NEOPIXEL_BAR_16, NEO_GRB + NEO_KHZ800, &
 
 void setup() {
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
 
diff --git a/examples/SnakeAutorun/SnakeAutorun.ino b/examples/SnakeAutorun/SnakeAutorun.ino
index 54b1009..fa017f8 100644
--- a/examples/SnakeAutorun/SnakeAutorun.ino
+++ b/examples/SnakeAutorun/SnakeAutorun.ino
@@ -141,8 +141,12 @@ void setup() {
     pinMode(LED_BUILTIN, OUTPUT);
 
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
 
diff --git a/examples/SnakeGame/SnakeGame.ino b/examples/SnakeGame/SnakeGame.ino
index f0a5bc7..e989cf0 100644
--- a/examples/SnakeGame/SnakeGame.ino
+++ b/examples/SnakeGame/SnakeGame.ino
@@ -61,8 +61,12 @@ void setup() {
     pinMode(TWO_BUTTON_MODE_SELECT_PIN, INPUT_PULLUP);
 
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
 
diff --git a/examples/SnowFlakes/SnowFlakes.ino b/examples/SnowFlakes/SnowFlakes.ino
index b45c903..b4dba0e 100644
--- a/examples/SnowFlakes/SnowFlakes.ino
+++ b/examples/SnowFlakes/SnowFlakes.ino
@@ -50,8 +50,12 @@ void setup() {
     pinMode(LED_BUILTIN, OUTPUT);
 
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
 
diff --git a/examples/TwoPatternsOnOneStrip/EasyButtonAtInt01.h b/examples/TwoPatternsOnOneStrip/EasyButtonAtInt01.h
index ccad002..6e30379 100644
--- a/examples/TwoPatternsOnOneStrip/EasyButtonAtInt01.h
+++ b/examples/TwoPatternsOnOneStrip/EasyButtonAtInt01.h
@@ -76,9 +76,13 @@
  */
 //#define LED_FEEDBACK_FOR_DEBOUNCE_TEST
 #if defined (LED_FEEDBACK_FOR_DEBOUNCE_TEST)
-#ifndef BUTTON_TEST_FEEDBACK_LED_PIN
-#define BUTTON_TEST_FEEDBACK_LED_PIN LED_BUILTIN  // if not specified, use built in led - pin 13 on Uno board
-#endif
+#  if ! defined(BUTTON_TEST_FEEDBACK_LED_PIN)
+#    if defined (LED_BUILTIN)
+#    define BUTTON_TEST_FEEDBACK_LED_PIN LED_BUILTIN  // if not specified, use built in led - pin 13 on Uno board
+#    else
+#    error "LED_FEEDBACK_FOR_DEBOUNCE_TEST defined but no BUTTON_TEST_FEEDBACK_LED_PIN or LED_BUILTIN defined"
+#    endif
+#  endif
 #endif
 
 //
diff --git a/examples/TwoPatternsOnOneStrip/TwoPatternsOnOneStrip.ino b/examples/TwoPatternsOnOneStrip/TwoPatternsOnOneStrip.ino
index 8c8785c..272db00 100644
--- a/examples/TwoPatternsOnOneStrip/TwoPatternsOnOneStrip.ino
+++ b/examples/TwoPatternsOnOneStrip/TwoPatternsOnOneStrip.ino
@@ -83,8 +83,12 @@ void setup() {
     pinMode(LED_BUILTIN, OUTPUT);
 
     Serial.begin(115200);
-    while (!Serial)
-        ; //delay for Leonardo
+#if defined(__AVR_ATmega32U4__)
+    while (!Serial); //delay for Leonardo, but this loops forever for Maple Serial
+#endif
+#if defined(SERIAL_USB)
+    delay(2000); // To be able to connect Serial monitor after reset and before first printout
+#endif
     // Just to know which program is running on my Arduino
     Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from  " __DATE__));
 
diff --git a/src/NeoPatterns.cpp b/src/NeoPatterns.cpp
index f0366fe..dca9001 100644
--- a/src/NeoPatterns.cpp
+++ b/src/NeoPatterns.cpp
@@ -108,7 +108,7 @@ NeoPatterns::NeoPatterns(uint16_t aNumberOfPixels, uint8_t aPin, uint8_t aTypeOf
  * }
  */
 NeoPatterns::NeoPatterns(NeoPixel * aUnderlyingNeoPixelObject, uint16_t aPixelOffset, uint16_t aNumberOfPixels, // @suppress("Class members should be properly initialized")
-         bool aEnableShowOfUnderlyingPixel,void (*aPatternCompletionCallback)(NeoPatterns*), bool aShowOnlyAtUpdate) :
+        bool aEnableShowOfUnderlyingPixel, void (*aPatternCompletionCallback)(NeoPatterns*), bool aShowOnlyAtUpdate) :
         NeoPixel(aUnderlyingNeoPixelObject, aPixelOffset, aNumberOfPixels, aEnableShowOfUnderlyingPixel) {
 
     OnPatternComplete = aPatternCompletionCallback;