Added comments to Basics examples

Author: tigoe

build/shared/examples/1.Basics/AnalogReadSerial/AnalogReadSerial.ino

@@ -1,15 +1,21 @@
 /*
   AnalogReadSerial
- Reads an analog input on pin 0, prints the result to the serial monitor 
+  Reads an analog input on pin 0, prints the result to the serial monitor.
+  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
  
  This example code is in the public domain.
  */
 
+// the setup routine runs once when you press reset:
 void setup() {
+  // initialize serial communication at 9600 bits per second:
   Serial.begin(9600);
 }
 
+// the loop routine runs over and over again forever:
 void loop() {
+  // read the input on analog pin 0:
   int sensorValue = analogRead(A0);
+  // print out the value you read:
   Serial.println(sensorValue);
 }

build/shared/examples/1.Basics/Blink/Blink.ino

@@ -4,16 +4,21 @@
  
   This example code is in the public domain.
  */
+ 
+// Pin 13 has an LED connected on most Arduino boards.
+// give it a name:
+int led = 13;
 
+// the setup routine runs once when you press reset:
 void setup() {                
   // initialize the digital pin as an output.
-  // Pin 13 has an LED connected on most Arduino boards:
-  pinMode(13, OUTPUT);     
+  pinMode(led, OUTPUT);     
 }
 
+// the loop routine runs over and over again forever:
 void loop() {
-  digitalWrite(13, HIGH);   // set the LED on
-  delay(1000);              // wait for a second
-  digitalWrite(13, LOW);    // set the LED off
-  delay(1000);              // wait for a second
+  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(1000);               // wait for a second
+  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
+  delay(1000);               // wait for a second
 }

build/shared/examples/1.Basics/DigitalReadSerial/DigitalReadSerial.ino

@@ -5,14 +5,23 @@
  This example code is in the public domain.
  */
 
+// digital pin 2 has a pushbutton attached to it. Give it a name:
+int pushButton = 2;
+
+// the setup routine runs once when you press reset:
 void setup() {
+  // initialize serial communication at 9600 bits per second:
   Serial.begin(9600);
-  pinMode(2, INPUT);
+  // make the pushbutton's pin an input:
+  pinMode(pushButton, INPUT);
 }
 
+// the loop routine runs over and over again forever:
 void loop() {
-  int sensorValue = digitalRead(2);
-  Serial.println(sensorValue);
+  // read the input pin:
+  int buttonState = digitalRead(pushButton);
+  // print out the state of the button:
+  Serial.println(buttonState);
 }
 
 

build/shared/examples/1.Basics/Fade/Fade.ino

@@ -5,19 +5,22 @@
  using the analogWrite() function.
  
  This example code is in the public domain.
- 
  */
+
+int led = 9;           // the pin that the LED is attached to
 int brightness = 0;    // how bright the LED is
 int fadeAmount = 5;    // how many points to fade the LED by
 
+// the setup routine runs once when you press reset:
 void setup()  { 
   // declare pin 9 to be an output:
-  pinMode(9, OUTPUT);
+  pinMode(led, OUTPUT);
 } 
 
+// the loop routine runs over and over again forever:
 void loop()  { 
   // set the brightness of pin 9:
-  analogWrite(9, brightness);    
+  analogWrite(led, brightness);    
 
   // change the brightness for next time through the loop:
   brightness = brightness + fadeAmount;
@@ -29,3 +32,4 @@ void loop()  {
   // wait for 30 milliseconds to see the dimming effect    
   delay(30);                            
 }
+