// **********************************************
// *                                            *
// * NAME          : Alexander Ioanidis         *
// * Program Name  : lightchaserthree.ino       *
// * Date          : 2023-03-01                 *
// * Desc          : program to make light      *
// *                 chaser with six patterns   *
// *                                            *
// **********************************************


int patternDelay = 100;                                                                             // delay time for the light patterns
int buttonPin = 6;                                                                                  // the pin for the button
int patternNumber = 0;                                                                              // the current pattern number   
int patternArray [6][3] = {{4,12,28} , {24,20,12} , {16,8,4} , {16,24,28} , {12,20,24} , {4,8,16}}; // the LED sequence for each pattern
int patternStep = 0;                                                                                // the current pattern step

void setup() {
  DDRB = B111111;                                                                                   // set all pins on port B to an OUTPUT
  pinMode(buttonPin, INPUT_PULLUP);                                                                 // config pin 6 to an INPUT
  pinMode(7, OUTPUT);                                                                               // config pin 7 to an OUTPUT
} // end setup()

void loop() {
  if (digitalRead(buttonPin) == LOW){                                                               // check if button is pressed
    patternNumber++;                                                                                // change to next pattern
    
    if (patternNumber == 6){                                                                        // check if pattern number exceeds the max possible patterns (6)
      patternNumber = 0;                                                                            // reset back to first pattern
    } // end if()
  
    tone (7, 500, 100);                                                                             // play buzzer at 500Hz for 100ms
    delay (110);                                                                                    // wait 110ms
  } // end if()

  PORTB = patternArray[patternNumber][patternStep];                                                 // plays the current LED pattern
  delay(patternDelay);                                                                              // wait 100ms
  patternStep++;                                                                                    // go to next step in pattern

  if (patternStep == 3){                                                                            // if patternStep exceeds max steps
    patternStep = 0;                                                                                // go back to first step in pattern
  } // if()
} // end loop()