Tic

Tic-Tac-Toe (Kółko i Krzyżyk) - ESP32 & LCD I2C

An interactive Tic-Tac-Toe game implemented on the ESP32 microcontroller, utilizing a 4x4 Matrix Keypad for player input and a 20x4 LCD Display (I2C) for the visual board representation.

📺 Project Demonstration

See the project in action on YouTube: 👉 Watch the Video Demonstration

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🛠️ Hardware Requirements

• Microcontroller: ESP32 (e.g., ESP32 NodeMCU-32S)
• Display: LCD 20x4 with an I2C interface adapter (PCF8574)
• Input: 4x4 Membrane Matrix Keypad
• Custom Baseboard PCB (or Connecting Wires & Breadboard)

Pin Mapping

⌨️ 4x4 Keypad Connection

📺 LCD 20x4 I2C Connection

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🗺️ Custom PCB Design

To eliminate messy breadboard wiring and create a durable, standalone gaming device, a dedicated dual-layer custom PCB baseboard was designed using KiCad.

Features:

• Socketed MCU: The board utilizes female pin headers, allowing the ESP32 NodeMCU to be easily plugged in or removed.
• Clean Peripherals Connection: Dedicated 1x08 and 1x04 pin headers are placed near the edges for straightforward ribbon cable routing from the keypad and LCD.
• Optimized Power Delivery: Safe 5V routing directly to the LCD backpack to ensure clear screen contrast without stressing the ESP32's internal 3.3V regulator.
• Ground Plane: Full top and bottom copper pour for noise reduction and stable operation.

The complete KiCad design files can be found in the hardware/ directory.

🖼️ 3D Render Preview:

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🕹️ Game Rules & Controls

1. Starting the Game: The game boots up automatically with player 'X' making the first move.
2. Making a Move: Use numeric keys 1 to 9 on the keypad to select a position on the 3x3 grid:

   1 | 2 | 3
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   4 | 5 | 6
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   7 | 8 | 9