#include <Tone.h>
Tone speakerpin;
int starttune[] = {NOTE_C4, NOTE_F4, NOTE_C4, NOTE_F4, NOTE_C4, 
 NOTE_F4, NOTE_C4, NOTE_F4, NOTE_G4, NOTE_F4, 
 NOTE_E4, NOTE_F4, NOTE_G4};
int duration2[] = {100, 200, 100, 200, 100, 400, 100, 100, 100, 100, 
 200, 100, 500};
int note[] = {NOTE_C4, NOTE_C4, NOTE_G4, NOTE_C5, NOTE_G4, NOTE_C5};
int duration[] = {100, 100, 100, 300, 100, 300}; 
int button[] = {2, 3, 4, 5}; // Pins connected to 
 // pushbutton inputs
int ledpin[] = {8, 9, 10, 11}; // Pins connected to LEDs
int turn = 0; // Turn counter
int buttonstate = 0; // Check pushbutton state
int randomArray[100]; // Array that can store up to 100 inputs
int inputArray[100];
void setup() {
 Serial.begin(9600);
 speakerpin.begin(12); // Pin connected to piezo buzzer
 for (int x = 0; x < 4; x++) {
 pinMode(ledpin[x], OUTPUT); // Set LED pins as output
 }
 for (int x = 0; x < 4; x++) {
 pinMode(button[x], INPUT); // Set pushbutton pins as inputs
 digitalWrite(button[x], HIGH); // Enable internal pullup; 
 // pushbuttons start in high 
 // position; logic reversed
 }
 // Generate "more randomness" with randomArray for the output 
 // function so pattern is different each time
 randomSeed(analogRead(0)); 
 for (int thisNote = 0; thisNote < 13; thisNote ++) {
 speakerpin.play(starttune[thisNote]); // Play the next note
 if (thisNote == 0 || thisNote == 2 || thisNote == 4 || 
 thisNote == 6) { // Hold the note
 digitalWrite(ledpin[0], HIGH);
 }
 if (thisNote == 1 || thisNote == 3 || thisNote == 5 || 
 thisNote == 7 || thisNote == 9 || thisNote == 11) {
 digitalWrite(ledpin[1], HIGH);
 }
 if (thisNote == 8 || thisNote == 12) {
 digitalWrite(ledpin[2], HIGH);
 }
 if (thisNote == 10) {
 digitalWrite(ledpin[3], HIGH);
 }
 delay(duration2[thisNote]);
 speakerpin.stop(); // Stop for the next note
 digitalWrite(ledpin[0], LOW);
digitalWrite(ledpin[1], LOW);
 digitalWrite(ledpin[2], LOW);
 digitalWrite(ledpin[3], LOW);
 delay(25);
 }
 delay(1000);
}
void loop() {
 // Generate the array to be matched by the player
 for (int y = 0; y <= 99; y++) { 
 digitalWrite(ledpin[0], HIGH);
 digitalWrite(ledpin[1], HIGH);
 digitalWrite(ledpin[2], HIGH);
 digitalWrite(ledpin[3], HIGH);
 // Play the next note
 for (int thisNote = 0; thisNote < 6; thisNote ++) { 
 speakerpin.play(note[thisNote]); // Hold the note
 delay(duration[thisNote]); // Stop for the next note
 speakerpin.stop();
 delay(25);
 }
 digitalWrite(ledpin[0], LOW);
 digitalWrite(ledpin[1], LOW);
 digitalWrite(ledpin[2], LOW);
 digitalWrite(ledpin[3], LOW);
 delay(1000);
 // Limited by the turn variable
 for (int y = turn; y <= turn; y++) { 
 Serial.println(""); 
 Serial.print("Turn: ");
 Serial.print(y);
 Serial.println("");
 randomArray[y] = random(1, 5); // Assign a random number (1-4)
 // Light LEDs in random order
 for (int x = 0; x <= turn; x++) {
 Serial.print(randomArray[x]);
 for (int y = 0; y < 4; y++) {
 if (randomArray[x] == 1 && ledpin[y] == 8) {
 digitalWrite(ledpin[y], HIGH);
 speakerpin.play(NOTE_G3, 100);
 delay(400);
 digitalWrite(ledpin[y], LOW);
 delay(100);
 }
 if (randomArray[x] == 2 && ledpin[y] == 9) {
 digitalWrite(ledpin[y], HIGH);
 speakerpin.play(NOTE_A3, 100);
 delay(400);
 digitalWrite(ledpin[y], LOW);
 delay(100);
 }
 if (randomArray[x] == 3 && ledpin[y] == 10) {
 digitalWrite(ledpin[y], HIGH);
speakerpin.play(NOTE_B3, 100);
 delay(400);
 digitalWrite(ledpin[y], LOW);
 delay(100);
 }
 if (randomArray[x] == 4 && ledpin[y] == 11) {
 digitalWrite(ledpin[y], HIGH);
 speakerpin.play(NOTE_C4, 100);
 delay(400);
 digitalWrite(ledpin[y], LOW);
 delay(100);
 }
 }
 }
 }
 input();
 }
}
// Check whether input matches the pattern
void input() { 
 for (int x = 0; x <= turn;) {
 for (int y = 0; y < 4; y++) {
 buttonstate = digitalRead(button[y]); // Check for button push
 if (buttonstate == LOW && button[y] == 2) {
 digitalWrite(ledpin[0], HIGH);
 speakerpin.play(NOTE_G3, 100);
 delay(200);
 digitalWrite(ledpin[0], LOW);
 inputArray[x] = 1;
 delay(250);
 Serial.print(" ");
 Serial.print(1);
 // Check if value of user input matches the generated array
 if (inputArray[x] != randomArray[x]) { 
 fail(); // If not, fail function is called
 }
 x++;
 }
 if (buttonstate == LOW && button[y] == 3) {
 digitalWrite(ledpin[1], HIGH);
 speakerpin.play(NOTE_A3, 100);
 delay(200);
 digitalWrite(ledpin[1], LOW);
 inputArray[x] = 2;
 delay(250);
 Serial.print(" ");
 Serial.print(2);
 if (inputArray[x] != randomArray[x]) {
 fail();
 }
 x++;
 }
 if (buttonstate == LOW && button[y] == 4) {
digitalWrite(ledpin[2], HIGH);
 speakerpin.play(NOTE_B3, 100);
 delay(200);
 digitalWrite(ledpin[2], LOW);
 inputArray[x] = 3;
 delay(250);
 Serial.print(" ");
 Serial.print(3);
 if (inputArray[x] != randomArray[x]) {
 fail();
 }
 x++;
 }
 if (buttonstate == LOW && button[y] == 5) {
 digitalWrite(ledpin[3], HIGH);
 speakerpin.play(NOTE_C4, 100);
 delay(200);
 digitalWrite(ledpin[3], LOW);
 inputArray[x] = 4;
 delay(250);
 Serial.print(" ");
 Serial.print(4);
 if (inputArray[x] != randomArray[x]) {
 fail();
 }
 x++;
 }
 }
 }
 delay(500);
 turn++; // Increment turn count
}
// Function used if player fails to match the sequence
void fail() { 
 for (int y = 0; y <= 2; y++) { // Flash lights to indicate failure
 digitalWrite(ledpin[0], HIGH);
 digitalWrite(ledpin[1], HIGH);
 digitalWrite(ledpin[2], HIGH);
 digitalWrite(ledpin[3], HIGH);
 speakerpin.play(NOTE_G3, 300);
 delay(200);
 digitalWrite(ledpin[0], LOW);
 digitalWrite(ledpin[1], LOW);
 digitalWrite(ledpin[2], LOW);
 digitalWrite(ledpin[3], LOW);
 speakerpin.play(NOTE_C3, 300);
 delay(200);
 }
 delay(500);
 turn = -1; // Reset turn value to start the game again
}