[Arduino] Arduino Basic and control button and LEDs

Arduino Basic

※ Open Source Hardware

- Arduino UNO : 8 bit CPU

- Arduino DUE

- Arduino TRE : Arduino + Beaglebone black

- Arduino Yun :(Built-in Wifi

- Arduino Mini Nano

- Netduino

- Raspberry Pi : 32 bit, Linux, 700 MB

- Beaglebone black : 32 bit, 1 GB, 512 MB Memory, Android O

- Intel Galileo : Pentium CPU,  can share Arduino shield

 

※ IDE

- Arduino Sketch : Language - C/C++

- Arduino Scratch : GNU Development Tool

- Arduino Processing : for Art

 

※ Arduino Shields

※ Sensor & Actuator

 

※ Breadboard

 

 

◎ Control Arduino Built-in LED

Source Code (Sketch Sample : Blink)

`/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino model, check
  the Technical Specs of your board  at https://www.arduino.cc/en/Main/Products
 
  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald
 
  modified 2 Sep 2016
  by Arturo Guadalupi
 
  modified 8 Sep 2016
  by Colby Newman
*/


// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, 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
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}

==> The built-in LED will blink every second.

◎ Control External LED

circuit diagram

Source Code : Same Source Code as above one

==> The External LED will blink every second.

Youtube Tutorial of above examples (in Korean) : https://www.youtube.com/watch?v=YcAdhH3Y-HU&list=PL0Vl139pNHbe-JlsydLg3NFRk6nC_cC7w&index=2

◎ Control multiple external LEDs

LED : Light-emitting diode 

circuit diagram

Source Code

#define DELAY_TIME 100

void setup() {
  // put your setup code here, to run once:
  pinMode(2. OUTPUT);
  pinMode(3. OUTPUT);
  pinMode(4. OUTPUT);
  pinMode(5. OUTPUT);
  pinMode(6. OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(2, HIGH);
  delay(DELAY_TIME);
  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);
  delay(DELAY_TIME);
  digitalWrite(3, LOW);
  digitalWrite(4, HIGH);
  delay(DELAY_TIME);
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  delay(DELAY_TIME);
  digitalWrite(5, LOW);
  digitalWrite(6, HIGH);
  delay(DELAY_TIME);
  digitalWrite(6, LOW);
  digitalWrite(5, HIGH);
  delay(DELAY_TIME);
  digitalWrite(5, LOW);
  digitalWrite(4, HIGH);
  delay(DELAY_TIME);
  digitalWrite(4, LOW);
  digitalWrite(3, HIGH);
  delay(DELAY_TIME);
  digitalWrite(3, LOW);
 
}

==> The LEDs will turn on and off sequentially.

Refactoring above code using FOR statement

#define DELAY_TIME 100

void setup() {
  // put your setup code here, to run once:
  for(int thisPin = 2; thisPin < 7; thisPin++) {
    pinMode(thisPin,OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  // loop from the lowest pin to the highest:
  for (int thisPin = 2; thisPin < 7; thisPin++) {
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
    delay(DELAY_TIME);
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }

  // loop from the highest pin to the lowest:
  for (int thisPin = 6; thisPin >= 2; thisPin--) {
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
    delay(DELAY_TIME);
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }
 
}

◎ Button Control

circuit diagram

Source Code

#define LED 12
#define BUTTON 7

void setup() {
  // put your setup code here, to run once:
  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(BUTTON) == HIGH) {
    digitalWrite(LED, HIGH);
    delay(500);
    digitalWrite(LED,LOW);
  }
}

==> If press the button then turn on the LED for 0.5 second.

Youtube Tutorial of above examples (in Korean) : https://www.youtube.com/watch?v=wtbjzGIQe_I&index=3&list=PL0Vl139pNHbe-JlsydLg3NFRk6nC_cC7w

Application

I am going to combine both Button control and Multiple LEDs control source codes.

Source Code

#define BUTTON 8
#define DELAY_TIME 100

void setup() {
  // put your setup code here, to run once:
  for(int thisPin = 2; thisPin < 7; thisPin++) {
    pinMode(thisPin,OUTPUT);
  }
  pinMode(BUTTON, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(BUTTON) == HIGH) {
    // loop from the lowest pin to the highest:
     for (int thisPin = 2; thisPin < 7; thisPin++) {
      // turn the pin on:
       digitalWrite(thisPin, HIGH);
      delay(DELAY_TIME);
       // turn the pin off:
      digitalWrite(thisPin, LOW);
     }

    // loop from the highest pin to the lowest:
    for (int thisPin = 6; thisPin >= 2; thisPin--) {
      // turn the pin on:
      digitalWrite(thisPin, HIGH);
      delay(DELAY_TIME);
      // turn the pin off:
      digitalWrite(thisPin, LOW);
    }
  }
}

==> The LEDs will turn on and off sequentially when press button