Arduino five led control in sequence with a button

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Controlling five LEDs with a button in a sequence with Arduino.

Using modulus operator we can turn on and off LEDs in sequence.

// www.mekanizmalar.com
// 2015/03/29
/*
  Demonstrates the use of an array to hold pin numbers.
  Each time the push button is pressed, next LED in the
  sequence will be turned on while the rest of LEDs are off.
*/
const int buttonPin = 2; // the number of the pushbutton pin
const int ledPin1 = 3;   // the number of the LED pin
const int ledPin2 = 4;   // the number of the LED pin
const int ledPin3 = 5;   // the number of the LED pin
const int ledPin4 = 6;   // the number of the LED pin
const int ledPin5 = 7;   // the number of the LED pin
// variables will change:
int buttonState = 0;     // variable for reading the pushbutton status
int buttonPressCount = 0;
int numberOfLED = 5;

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4, OUTPUT);
  pinMode(ledPin5, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    if (buttonPressCount % numberOfLED == 0)
      digitalWrite(ledPin1, HIGH); // turn LED1 on:
    else
      digitalWrite(ledPin1, LOW);

if (buttonPressCount % numberOfLED == 1)
      digitalWrite(ledPin2, HIGH); // turn LED2 on:
    else
      digitalWrite(ledPin2, LOW);

if (buttonPressCount % numberOfLED == 2)
      digitalWrite(ledPin3, HIGH); // turn LED3 on:
    else
      digitalWrite(ledPin3, LOW);

if (buttonPressCount % numberOfLED == 3)
      digitalWrite(ledPin4, HIGH); // turn LED4 on:
    else
      digitalWrite(ledPin4, LOW);

if (buttonPressCount % numberOfLED == 4)
      digitalWrite(ledPin5, HIGH); // turn LED5 on:
    else
      digitalWrite(ledPin5, LOW);

buttonPressCount++;
    delay(300);
  }
}

By using arrays we can shorten the code as seen below

// www.mekanizmalar.com
// 2015/03/29
/*
  Demonstrates the use of an array to hold pin numbers.
  Each time the push button is pressed, next LED in the
  sequence will be turned on while the rest of LEDs are off.
*/
const int buttonPin = 2; // the pin number of the pushbutton input pin
const int ledPins[] = {3, 4, 5, 6, 7};
// variables will change:
int buttonState = 0; // variable for reading the pushbutton status
int buttonPressCount = 0;
int numberOfLED = 5;

void setup() {
  // initialize the LED pin as an output:
  for (int i = 0; i < numberOfLED; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    for (int i = 0; i < numberOfLED; i++) {
      if (buttonPressCount % numberOfLED == i)
        digitalWrite(ledPins[i], HIGH);  // turn LED on
      else
        digitalWrite(ledPins[i], LOW);   // turn LED off
    }
  }
  buttonPressCount++;
  delay(300);
}