Arduino Simon Says Game: Build with LEDs and Buttons

Table of Contents

• Introduction
• Components and Hardware Setup
• Wiring Diagram and Connections
• Complete Code with Explanation
• Customization and Improvements
• Troubleshooting Common Issues
• Advanced Features and Extensions
• Frequently Asked Questions
• Conclusion

Introduction

The Arduino Simon Says game is one of the best beginner projects for learning Arduino programming. It teaches arrays, random numbers, loops, input handling, timing, and state machines — all wrapped in a fun, interactive game. You will build the classic memory game where the Arduino plays a sequence of LED flashes and the player must repeat the sequence by pressing the corresponding buttons.

This project requires only 4 LEDs, 4 buttons, a piezo buzzer, and an Arduino — components typically included in starter kits. The total cost is under ₹100 if you already have an Arduino board.

Components and Hardware Setup

• Arduino Uno or Nano
• 4 LEDs (red, green, blue, yellow)
• 4 push buttons
• 4x 220 ohm resistors (for LEDs)
• 1 piezo buzzer
• Breadboard and jumper wires

Wiring Diagram and Connections

// LED pins: 8 (red), 9 (green), 10 (blue), 11 (yellow)
// Button pins: 2, 3, 4, 5 (with INPUT_PULLUP)
// Buzzer: pin 7
const int ledPins[] = {8, 9, 10, 11};
const int btnPins[] = {2, 3, 4, 5};
const int tones[] = {262, 330, 392, 523}; // C4, E4, G4, C5
const int BUZZER = 7;

Complete Code with Explanation

#define MAX_LEVEL 100
int sequence[MAX_LEVEL];
int level = 0;

void setup() {
  for (int i=0; i<4; i++) { pinMode(ledPins[i], OUTPUT); pinMode(btnPins[i], INPUT_PULLUP); }
  pinMode(BUZZER, OUTPUT);
  randomSeed(analogRead(A0));
  startAnimation();
}

void loop() {
  // Add new step to sequence
  sequence[level] = random(4);
  level++;

  // Play sequence
  for (int i=0; i<level; i++) {
    flashLED(sequence[i], 400);
    delay(200);
  }

  // Get player input
  for (int i=0; i<level; i++) {
    int btn = waitForButton();
    if (btn != sequence[i]) { gameOver(); return; }
    flashLED(btn, 200);
  }

  // Success - brief pause before next round
  delay(500);
}

void flashLED(int idx, int duration) {
  digitalWrite(ledPins[idx], HIGH);
  tone(BUZZER, tones[idx], duration);
  delay(duration);
  digitalWrite(ledPins[idx], LOW);
}

int waitForButton() {
  while (true) {
    for (int i=0; i<4; i++) {
      if (digitalRead(btnPins[i]) == LOW) {
        delay(50); // Debounce
        while (digitalRead(btnPins[i]) == LOW); // Wait release
        return i;
      }
    }
  }
}

void gameOver() {
  // Flash all LEDs and play sad tone
  for (int j=0; j<3; j++) {
    for (int i=0; i<4; i++) digitalWrite(ledPins[i], HIGH);
    tone(BUZZER, 100, 300); delay(300);
    for (int i=0; i<4; i++) digitalWrite(ledPins[i], LOW);
    delay(300);
  }
  level = 0; delay(1000);
}

void startAnimation() {
  for (int i=0; i<4; i++) { flashLED(i, 150); }
}

Customization and Improvements

• Add speed increase: reduce delay as levels increase for more challenge
• Add score display with 7-segment LED or OLED screen
• Store high score in EEPROM
• Add two-player mode where players take turns
• Add a timeout — if the player takes too long, game over

Troubleshooting Common Issues

• Buttons register multiple presses: Add debounce delay (50ms) and wait for button release
• LEDs do not light up: Check resistor values (220 ohm) and LED polarity (long leg = anode = positive)
• Sequence always the same: Use randomSeed(analogRead(A0)) to seed the random number generator with noise from a floating analog pin

Advanced Features and Extensions

Replace LEDs with WS2812 NeoPixels for RGB colour effects. Add an accelerometer — instead of pressing buttons, tilt the device in the correct direction. This creates a physical, motion-controlled version of Simon Says.

Frequently Asked Questions

What is the maximum level?

With a 100-element array, the game supports 100 levels. Each level adds one step, so level 100 requires memorising and repeating a 100-step sequence. Most humans struggle beyond level 15-20.

Can I use RGB LEDs instead of single-colour LEDs?

Yes, use common-cathode RGB LEDs and assign different colours to each button. You will need 3 pins per LED (12 total) or use a WS2812 strip with just 1 data pin.

Conclusion

The Arduino Simon Says game is a perfect starter project that teaches essential programming concepts while creating something genuinely fun to play. Build it for your college electronics lab, makerspace, or as a gift for younger family members learning electronics.