Update all URLs in example comments

Some of the URLs were broken. Almost all of the URLs had changed, but were still working due to redirects. However, these redirects might stop working at some time in the future (as happened during the last round of website reorganization) so it's safest to point them to the final location.
arduino · Mar 26, 2021 · 972f6e5 · 972f6e5
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diff --git a/examples/01.Basics/Blink/Blink.ino b/examples/01.Basics/Blink/Blink.ino
@@ -19,7 +19,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Blink
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
 */
 
 // the setup function runs once when you press reset or power the board

diff --git a/examples/01.Basics/DigitalReadSerial/DigitalReadSerial.ino b/examples/01.Basics/DigitalReadSerial/DigitalReadSerial.ino
@@ -5,7 +5,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/DigitalReadSerial
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/DigitalReadSerial
 */
 
 // digital pin 2 has a pushbutton attached to it. Give it a name:

diff --git a/examples/01.Basics/Fade/Fade.ino b/examples/01.Basics/Fade/Fade.ino
@@ -10,7 +10,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Fade
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Fade
 */
 
 int led = 9;           // the PWM pin the LED is attached to

diff --git a/examples/01.Basics/ReadAnalogVoltage/ReadAnalogVoltage.ino b/examples/01.Basics/ReadAnalogVoltage/ReadAnalogVoltage.ino
@@ -7,7 +7,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/ReadAnalogVoltage
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/ReadAnalogVoltage
 */
 
 // the setup routine runs once when you press reset:

diff --git a/examples/02.Digital/BlinkWithoutDelay/BlinkWithoutDelay.ino b/examples/02.Digital/BlinkWithoutDelay/BlinkWithoutDelay.ino
@@ -25,7 +25,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/BlinkWithoutDelay
 */
 
 // constants won't change. Used here to set a pin number:

diff --git a/examples/02.Digital/Button/Button.ino b/examples/02.Digital/Button/Button.ino
@@ -19,7 +19,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Button
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Button
 */
 
 // constants won't change. They're used here to set pin numbers:

diff --git a/examples/02.Digital/Debounce/Debounce.ino b/examples/02.Digital/Debounce/Debounce.ino
@@ -24,7 +24,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Debounce
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Debounce
 */
 
 // constants won't change. They're used here to set pin numbers:

diff --git a/examples/02.Digital/DigitalInputPullup/DigitalInputPullup.ino b/examples/02.Digital/DigitalInputPullup/DigitalInputPullup.ino
@@ -17,7 +17,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/InputPullupSerial
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/InputPullupSerial
 */
 
 void setup() {

diff --git a/examples/02.Digital/StateChangeDetection/StateChangeDetection.ino b/examples/02.Digital/StateChangeDetection/StateChangeDetection.ino
@@ -21,7 +21,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/ButtonStateChange
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/StateChangeDetection
 */
 
 // this constant won't change:

diff --git a/examples/02.Digital/toneKeyboard/toneKeyboard.ino b/examples/02.Digital/toneKeyboard/toneKeyboard.ino
@@ -14,7 +14,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Tone3
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneKeyboard
 */
 
 #include "pitches.h"

diff --git a/examples/02.Digital/toneMelody/toneMelody.ino b/examples/02.Digital/toneMelody/toneMelody.ino
@@ -12,7 +12,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Tone
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneMelody
 */
 
 #include "pitches.h"

diff --git a/examples/02.Digital/toneMultiple/toneMultiple.ino b/examples/02.Digital/toneMultiple/toneMultiple.ino
@@ -12,7 +12,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Tone4
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneMultiple
 */
 
 void setup() {

diff --git a/examples/02.Digital/tonePitchFollower/tonePitchFollower.ino b/examples/02.Digital/tonePitchFollower/tonePitchFollower.ino
@@ -14,7 +14,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Tone2
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/tonePitchFollower
 */
 
 void setup() {

diff --git a/examples/03.Analog/AnalogInOutSerial/AnalogInOutSerial.ino b/examples/03.Analog/AnalogInOutSerial/AnalogInOutSerial.ino
@@ -17,7 +17,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/AnalogInOutSerial
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/AnalogInOutSerial
 */
 
 // These constants won't change. They're used to give names to the pins used:

diff --git a/examples/03.Analog/AnalogInput/AnalogInput.ino b/examples/03.Analog/AnalogInput/AnalogInput.ino
@@ -24,7 +24,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/AnalogInput
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/AnalogInput
 */
 
 int sensorPin = A0;    // select the input pin for the potentiometer

diff --git a/examples/03.Analog/AnalogWriteMega/AnalogWriteMega.ino b/examples/03.Analog/AnalogWriteMega/AnalogWriteMega.ino
@@ -12,7 +12,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/AnalogWriteMega
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/AnalogWriteMega
 */
 
 // These constants won't change. They're used to give names to the pins used:

diff --git a/examples/03.Analog/Calibration/Calibration.ino b/examples/03.Analog/Calibration/Calibration.ino
@@ -23,7 +23,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Calibration
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Calibration
 */
 
 // These constants won't change:

diff --git a/examples/03.Analog/Fading/Fading.ino b/examples/03.Analog/Fading/Fading.ino
@@ -13,7 +13,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Fading
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Fading
 */
 
 int ledPin = 9;    // LED connected to digital pin 9

diff --git a/examples/03.Analog/Smoothing/Smoothing.ino b/examples/03.Analog/Smoothing/Smoothing.ino
@@ -15,7 +15,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Smoothing
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Smoothing
 */
 
 // Define the number of samples to keep track of. The higher the number, the

diff --git a/examples/04.Communication/ASCIITable/ASCIITable.ino b/examples/04.Communication/ASCIITable/ASCIITable.ino
@@ -16,7 +16,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/ASCIITable
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/ASCIITable
 */
 
 void setup() {

diff --git a/examples/04.Communication/Dimmer/Dimmer.ino b/examples/04.Communication/Dimmer/Dimmer.ino
@@ -17,7 +17,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Dimmer
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Dimmer
 */
 
 const int ledPin = 9;      // the pin that the LED is attached to

diff --git a/examples/04.Communication/Graph/Graph.ino b/examples/04.Communication/Graph/Graph.ino
@@ -22,7 +22,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Graph
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Graph
 */
 
 void setup() {

diff --git a/examples/04.Communication/Midi/Midi.ino b/examples/04.Communication/Midi/Midi.ino
@@ -17,7 +17,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Midi
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Midi
 */
 
 void setup() {

diff --git a/examples/04.Communication/PhysicalPixel/PhysicalPixel.ino b/examples/04.Communication/PhysicalPixel/PhysicalPixel.ino
@@ -18,7 +18,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/PhysicalPixel
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/PhysicalPixel
 */
 
 const int ledPin = 13; // the pin that the LED is attached to

diff --git a/examples/04.Communication/SerialCallResponse/SerialCallResponse.ino b/examples/04.Communication/SerialCallResponse/SerialCallResponse.ino
@@ -18,7 +18,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/SerialCallResponse
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/SerialCallResponse
 */
 
 int firstSensor = 0;    // first analog sensor

diff --git a/examples/04.Communication/SerialCallResponseASCII/SerialCallResponseASCII.ino b/examples/04.Communication/SerialCallResponseASCII/SerialCallResponseASCII.ino
@@ -19,7 +19,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/SerialCallResponseASCII
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/SerialCallResponseASCII
 */
 
 int firstSensor = 0;    // first analog sensor

diff --git a/examples/04.Communication/SerialEvent/SerialEvent.ino b/examples/04.Communication/SerialEvent/SerialEvent.ino
@@ -15,7 +15,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/SerialEvent
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/SerialEvent
 */
 
 String inputString = "";         // a String to hold incoming data

diff --git a/examples/04.Communication/VirtualColorMixer/VirtualColorMixer.ino b/examples/04.Communication/VirtualColorMixer/VirtualColorMixer.ino
@@ -13,7 +13,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/VirtualColorMixer
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/VirtualColorMixer
 */
 
 const int redPin = A0;		// sensor to control red color

diff --git a/examples/05.Control/Arrays/Arrays.ino b/examples/05.Control/Arrays/Arrays.ino
@@ -17,7 +17,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Array
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Arrays
 */
 
 int timer = 100;           // The higher the number, the slower the timing.

diff --git a/examples/05.Control/ForLoopIteration/ForLoopIteration.ino b/examples/05.Control/ForLoopIteration/ForLoopIteration.ino
@@ -14,7 +14,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/ForLoop
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/ForLoopIteration
 */
 
 int timer = 100;           // The higher the number, the slower the timing.

diff --git a/examples/05.Control/IfStatementConditional/IfStatementConditional.ino b/examples/05.Control/IfStatementConditional/IfStatementConditional.ino
@@ -21,7 +21,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/IfStatement
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/ifStatementConditional
 */
 
 // These constants won't change:

diff --git a/examples/05.Control/WhileStatementConditional/WhileStatementConditional.ino b/examples/05.Control/WhileStatementConditional/WhileStatementConditional.ino
@@ -24,7 +24,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/WhileLoop
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/WhileStatementConditional
 */
 
 

diff --git a/examples/05.Control/switchCase/switchCase.ino b/examples/05.Control/switchCase/switchCase.ino
@@ -18,7 +18,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/SwitchCase
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/SwitchCase
 */
 
 // these constants won't change. They are the lowest and highest readings you

diff --git a/examples/05.Control/switchCase2/switchCase2.ino b/examples/05.Control/switchCase2/switchCase2.ino
@@ -17,7 +17,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/SwitchCase2
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/SwitchCase2
 */
 
 void setup() {

diff --git a/examples/06.Sensors/ADXL3xx/ADXL3xx.ino b/examples/06.Sensors/ADXL3xx/ADXL3xx.ino
@@ -4,7 +4,7 @@
   Reads an Analog Devices ADXL3xx accelerometer and communicates the
   acceleration to the computer. The pins used are designed to be easily
   compatible with the breakout boards from SparkFun, available from:
-  http://www.sparkfun.com/commerce/categories.php?c=80
+  https://www.sparkfun.com/categories/80
 
   The circuit:
   - analog 0: accelerometer self test
@@ -21,7 +21,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/ADXL3xx
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/ADXL3xx
 */
 
 // these constants describe the pins. They won't change:

diff --git a/examples/06.Sensors/Knock/Knock.ino b/examples/06.Sensors/Knock/Knock.ino
@@ -18,7 +18,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Knock
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Knock
 */
 
 

diff --git a/examples/06.Sensors/Memsic2125/Memsic2125.ino b/examples/06.Sensors/Memsic2125/Memsic2125.ino
@@ -18,7 +18,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Memsic2125
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Memsic2125
 */
 
 // these constants won't change:

diff --git a/examples/06.Sensors/Ping/Ping.ino b/examples/06.Sensors/Ping/Ping.ino
@@ -18,7 +18,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/Ping
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Ping
 */
 
 // this constant won't change. It's the pin number of the sensor's output:
@@ -67,7 +67,7 @@ long microsecondsToInches(long microseconds) {
   // microseconds per inch (i.e. sound travels at 1130 feet per second).
   // This gives the distance travelled by the ping, outbound and return,
   // so we divide by 2 to get the distance of the obstacle.
-  // See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
+  // See: https://www.parallax.com/package/ping-ultrasonic-distance-sensor-downloads/
   return microseconds / 74 / 2;
 }
 

diff --git a/examples/07.Display/RowColumnScanning/RowColumnScanning.ino b/examples/07.Display/RowColumnScanning/RowColumnScanning.ino
@@ -4,7 +4,7 @@
   This example controls an 8x8 LED matrix using two analog inputs.
 
   This example works for the Lumex LDM-24488NI Matrix. See
-  http://sigma.octopart.com/140413/datasheet/Lumex-LDM-24488NI.pdf
+  https://sigma.octopart.com/140413/datasheet/Lumex-LDM-24488NI.pdf
   for the pin connections.
 
   For other LED cathode column matrixes, you should only need to change the pin
@@ -28,9 +28,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/RowColumnScanning
-
-  see also http://www.tigoe.net/pcomp/code/category/arduinowiring for more
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/RowColumnScanning
 */
 
 // 2-dimensional array of row pin numbers:

diff --git a/examples/07.Display/barGraph/barGraph.ino b/examples/07.Display/barGraph/barGraph.ino
@@ -17,7 +17,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/BarGraph
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/BarGraph
 */
 
 // these constants won't change:

diff --git a/examples/08.Strings/CharacterAnalysis/CharacterAnalysis.ino b/examples/08.Strings/CharacterAnalysis/CharacterAnalysis.ino
@@ -10,7 +10,7 @@
 
   This example code is in the public domain.
 
-  http://www.arduino.cc/en/Tutorial/CharacterAnalysis
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/CharacterAnalysis
 */
 
 void setup() {