/*
Zainab Khan
LightChaser.ino
March 25, 2025
This program makes three LED lights go on and off 
in a set pattern depending on a button press 
using arrays and DDRB 
with a potentiometer for speed adjustment  
*/

int buttonPin = 7; // button is connected to pin 7

int patternNum = 0; // variable to track the state(pattern number to display)

int potPin = A5; // Potentiometer is connected to A5

int potVal; // variable to store potentiometer reading 

int patternSpeed; // variable for the delay between patterns 


int patternArray[6][3] { // an array with 6 rows and 3 columns
  {B001000, B011000, B111000}, // pattern 0
  {B110000, B101000, B011000}, // pattern 1
  {B100000, B010000, B001000}, // pattern 2
  {B100000, B110000, B111000}, // pattern 3
  {B011000, B101000, B110000}, // pattern 4
  {B001000, B010000, B100000}, // pattern 5
}; // end of patternArray

void setup() {
  DDRB = B111111; // assigning pins 8 - 13 as outputs
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(9600);
  
} // end of void setup

void loop() {
 
  int buttonVal = digitalRead(buttonPin);  // when buttonVal is used in code it will read the value of buttonPin

  potVal = analogRead(potPin); // read the value from the potentiometer - range (0-1023)
 
  patternSpeed = map(potVal, 0, 1023, 0, 500); 
  // changes the 0-1023 reading to a 0-500 millisecond scale

  if (buttonVal == LOW) { // checking if the buttonPins value is Low
    patternNum++; // When buttonVal is equal to LOW patternNum is updated to patternNum + 1
  } // end of if for buttonVal == LOW
  
  for (int i = 0; i < 3; i++) { // i is equal to 0, if i is 3 or greater than 3, i will be updated by 1
    PORTB = patternArray[patternNum][i];
    delay(patternSpeed);

    if (patternNum == 6) { // checking if patternNum = 6
      patternNum = 0;
      delay(patternSpeed);
    } // end of if for patternNum 6

  } // end of for loop

  
  // printing what pattern it is displaying
  Serial.print("Pattern State: ");
  Serial.print(patternNum);
  Serial.println(" ");
  delay(100);
  
  Serial.print("                    ");

  // printing what the pattern speed is
  Serial.print("pattern Speed: ");
  Serial.println(patternSpeed);
  delay(100);

} // end of void loop