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arduino:program_structure [2012/09/13 06:01]
mithat [Main loop]
arduino:program_structure [2012/09/14 01:20] (current)
mithat
Line 1: Line 1:
-====== Program structure ====== +Moved [[arduino:arduino_crash_course:​program_structure|here]].
- +
-===== 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). +
- +
-<file c program_structure.ino>​ +
-void setup() { +
-  // Stuff in here gets run once when the program starts. +
-+
- +
-void loop() { +
-  // Stuff in here gets run over and over and over again (until you turn the power off). +
-+
-</​file>​ +
- +
-===== Blink an LED ===== +
- +
-Blinking an LED is the microcontroller equivalent to a "[[https://​en.wikipedia.org/​wiki/​Hello_world|Hello world]]" program in general programming. +
- +
-<file c BlinkMe.ino>​ +
-/* +
-  BlinkMe +
-  Turn an LED on and off once per second. +
- */ +
- +
-void setup() {                 +
-  // make pin 13 an output +
-  pinMode(13, OUTPUT); ​     +
-+
- +
-void loop() { +
-  digitalWrite(13,​ HIGH); ​   // turn the LED on (HIGH is the voltage level) +
-  delay(1000); ​              // wait one second (1000 milliseconds) +
-  digitalWrite(13,​ LOW);     // turn the LED off by making the voltage LOW +
-  delay(1000); ​              // wait one second +
-+
-</​file>​ +
- +
-Here is the same example but using a **variable** to store the pin number. +
- +
-<file c BlinkMe2.ino>​ +
-/* +
-  BlinkMe2 +
-  Turn an LED on and off once per second (improved version). +
- */ +
- +
-// use variable ledPin to store the pin number that drives the LED +
-int ledPin = 13; +
- +
-void setup() {                 +
-  // make ledPin an output +
-  pinMode(ledPin,​ OUTPUT); ​     +
-+
- +
-void loop() { +
-  digitalWrite(ledPin,​ HIGH); ​  // turn the LED on +
-  delay(1000); ​                 // wait one second +
-  digitalWrite(ledPin,​ LOW);    // turn the LED off +
-  delay(1000); ​                 // wait one second +
-+
-</​file>​ +
- +
-Now if we need to change the pin number, we only need to change it in one place. +
- +
-Here we use variables also to define delay times: +
- +
-<file c BlinkMe3.ino>​ +
-/* +
-  BlinkMe3 +
-  Turn an LED on and off once per second (another improved version). +
- */ +
- +
-// 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; +
-int offTime = 1000; +
- +
-void setup() {                 +
-  // make ledPin an output +
-  pinMode(ledPin,​ OUTPUT); ​     +
-+
- +
-void loop() { +
-  digitalWrite(ledPin,​ HIGH); ​  // turn the LED on +
-  delay(onTime); ​               // wait onTime mS +
-  digitalWrite(ledPin,​ LOW);    // turn the LED off +
-  delay(offTime); ​              // wait offTime mS +
-+
-</​file>​+
arduino/program_structure.txt · Last modified: 2012/09/14 01:20 by mithat