/*
Zainab Khan
LightChaser.ino
Febuary 27, 2025
This program makes a three LED lights go on and off 
in a set pattern depending on a button press 
*/


int redLED = 13; //red LED is connected to pin 13
int yellowLED = 12; // yellow LED is connected to pin 12 
int greenLED = 11; // green LED is connected to pin 11

int buttonPin = 8; // button is connected to pin 8

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

int patternSpeed = 100; // variable for the delay between patterns 

void pat0(){
  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);

  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);

  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);
} // end of void pat for pattern 0

void pat1(){
  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, LOW);
  delay(patternSpeed);

  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);

  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);
} // end of void pat for pattern 1

void pat2(){
  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, LOW);
  delay(patternSpeed);

  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, LOW);
  delay(patternSpeed);

  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);
} // end of void pat for pattern 2

void pat3(){
  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, LOW);
  delay(patternSpeed);

  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, LOW);
  delay(patternSpeed);

  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);

} // end of void pat for pattern 3

void pat4(){
  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);

  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);

  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, LOW);
  delay(patternSpeed);
} // end of void pat for pattern 4

void pat5(){
  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, HIGH);
  delay(patternSpeed);

  digitalWrite(redLED, LOW);
  digitalWrite(yellowLED, HIGH);
  digitalWrite(greenLED, LOW);
  delay(patternSpeed);

  digitalWrite(redLED, HIGH);
  digitalWrite(yellowLED, LOW);
  digitalWrite(greenLED, LOW);
  delay(patternSpeed);
} // end of void pat for pattern 5


void setup() {
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);

  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

  // selecting pattern by determining if the button is HIGH or LOW
  // to determine what pattern to play next -- state + 1 (previous pattern number + 1)

  if (buttonVal == LOW) { // checking if the buttonPins value is Low
    patternNum = patternNum + 1; // When buttonVal is equal to LOW patternNum is updated to patternNum + 1
  } // end of if for buttonVal == LOW
  
  else if (patternNum == 0) { // checking if putternNum = 0
    pat0(); 
  } // end of if for patternNum 0

  else if (patternNum == 1) { // checking if putternNum = 1
    pat1();
  } // end of else if for patternNum 1

  else if (patternNum == 2) { // checking if putternNum = 2
    pat2();
  } // end of else if for patternNum 2

  else if (patternNum == 3) { // checking if putternNum = 3
    pat3();
  } // end of else if for patternNum 3

  else if (patternNum == 4) { // checking if putternNum = 4
    pat4();
  } // end of else if for patternNum 4

  else if (patternNum == 5) { // checking if putternNum = 5
    pat5();
  } // end of else if for patternNum 5

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

  // printing what pattern it is displaying
  Serial.print("Pattern State: ");
  Serial.print(patternNum);
  Serial.println(" ");
  delay(150);
  
} // end of void loop