Improves the documentation for Grove_Button.

Author: xale

Grove_Button/Grove_Button.ino

@@ -1,30 +1,36 @@
-// demo of Grove - Starter V2.0
-// Loovee  2013-3-10
-// this demo will show you how to use Grove - Button to control a LED
-// when the button was pressed, the led will on 
-// otherwise led off
-// Grove - Button connect to D3
-// Grove - LED connect to D7
+// Demo for Grove - Starter V2.0
+// Author: Loovee  2013-3-10
 
-const int pinButton = 3;                        // pin of button define here
-const int pinLed    = 7;                        // pin of led define here
+// Uses the Grove - Button to control the Grove - LED.
+// Connect the Grove - Button to the socket marked D3
+// Connect the Grove - LED to D7
+
+// Defines the pins to which the button and LED are connected.
+const int pinButton = 3;
+const int pinLed    = 7;
 
 void setup()
 {
-    pinMode(pinButton, INPUT);                  // set button INPUT
-    pinMode(pinLed, OUTPUT);                    // set led OUTPUT
+    // Configure the button's pin for input signals.
+    pinMode(pinButton, INPUT);
+
+    // Configure the LED's pin for output.
+    pinMode(pinLed, OUTPUT);
 }
 
 void loop()
 {
-    if(digitalRead(pinButton))                     // when button is pressed
+    if(digitalRead(pinButton))
     {
-        digitalWrite(pinLed, HIGH);             // led on
+        // When the button is pressed, turn the LED on.
+        digitalWrite(pinLed, HIGH);
     }
     else
     {
+        // Otherwise, turn the LED off.
         digitalWrite(pinLed, LOW);
     }
 
     delay(10);
 }
+