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--- arduino:arduino_crash_course:program_structure [2012/11/03 01:46] – mithat
+++ arduino:arduino_crash_course:program_structure [2017/11/06 02:23] – mithat
@@ Line 3: / Line 3: @@
 ===== Main loop =====
-All Arduino programs (called "sketches") have the same basic structure: a ''setup'' function and a ''loop'' function. Whatever you write in the body of the ''setup'' function will happen only once--when the program starts (e.g. after you power up the Arduino, press the reset button, or load a new program). Whatever you write in the body of the ''loop'' function will happen over and over as fast as possible until you halt the program (e.g., by removing the power, pushing the reset button, or loading a new program).
+Arduino programs are called **sketches**. The source code for a sketch is stored in a text file that has a ''ino'' file extension.
+Arduino sketches all have the same basic structure, consisting of a ''setup'' function and a ''loop'' function.
 <file c program_structure.ino>
@@ Line 11: / Line 13: @@
 void loop() {
-  // Stuff in here gets run over and over and over again (until you turn the power off).
+  // Stuff in here gets run over and over and over again
+  // (until you turn the power off).
 }
 </file>
+Whatever you write in the body of the ''setup'' function will happen only once---when the program starts (e.g. after you power up the Arduino, press the reset button, or load a new program). Whatever you write in the body of the ''loop'' function will happen over and over as fast as the Arduino can manage until you halt the program (e.g., by removing the power, pushing the reset button, or loading a new program).
 ===== Blink an LED =====
-Blinking an LED is the microcontroller equivalent to a "[[wp>Hello_world|Hello world]]" program in general programming.
+Blinking an LED is the microcontroller equivalent to a "[[wp>Hello_world|Hello world]]" program in general programming. Here is how to blink an LED in Arduino:
 <file c BlinkMe.ino>
@@ Line 62: / Line 66: @@
 </file>
-Now if we need to change the pin number, we only need to change it in one place.
+One of the advantages of using a named value for the pin number is that if we want to change the pin number we only need to change it in one place.
 Here we use variables also to define delay times:
@@ Line 74: / Line 78: @@
 // use variable ledPin to store the pin number that drives the LED
 int ledPin = 13;
 // define the LED's on and off times in milliseconds
 int onTime = 1000;