Blink ino

Basic Blink program on Arduino

This tutorial will walk you through how to program the basic Blink Sketch onto an Arduino.

Basic Program structure

Every Arduino Sketch (program) needs a setup and loop function and is written in C++.

The setup function runs once when you press reset or power the board. While the loop function runs over and over again forever.

The loop function can be agnored if the commands just need to be ran once or you put a while(true) loop inside the setup.

If you perfer working with a main function that can be done. Just have the setup function call main (main()). In the main if anything that needs to occur more than once remember to use loops. Main can be a void or an int with normal C/C++ returns.

Blink with Both Loop and Setup Functions

// the setup function runs once when you press reset or power the board
void setup() {
  pinMode(LED_BUILTIN, OUTPUT); // initialize digital pin LED_BUILTIN as an output.
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second or 1000 milisecond
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second or 1000 milisecond
}

Blink with Setup Function

// the setup function runs once when you press reset or power the board
void setup() {
  pinMode(LED_BUILTIN, OUTPUT); // initialize digital pin LED_BUILTIN as an output.

  while(true){ // while true runs over and over again forever
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(1000);                       // wait for a second
    digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
    delay(1000);                       // wait for a second
  }
}


void loop() { } // here for structure

Blink with int main

// the setup function runs once when you press reset or power the board
void setup() {main();} // call main function

void loop() { } // here for structure

// the main function is here as the main function for commands 
int main(){ 
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  while(true){ // while true runs over and over again forever
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(1000);                       // wait for a second
    digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
    delay(1000);                       // wait for a second
  }

  return 0; // No errors
}

Blink with void main

// the setup function runs once when you press reset or power the board
void setup() {main();} // call main function

void loop() { } // here for structure

// the main function is here as the main function for commands 
void main(){ 
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  while(true){ // while true runs over and over again forever
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(1000);                       // wait for a second
    digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
    delay(1000);                       // wait for a second
  }
}