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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Yes. ArduinoGotchi is a genuine first-generation Tamagotchi P1 emulator for an Arduino UNO. It uses the open-source TamaLIB emulation core, an SSD1306 128×64 I²C OLED, three buttons and a buzzer. It is not a turnkey ROM package: you must supply a compatible rom.bin, convert it, and comply with the law where you live.
The project is best understood as a compact emulation experiment rather than a drop-in replacement for an original Tamagotchi. It runs somewhat slower than the original hardware, saves approximately every 60 minutes by default, and uses a modern OLED instead of the original 32×16 LCD.
Why ArduinoGotchi is a real emulator
A Tamagotchi-inspired Arduino game can copy feeding, cleaning and growth mechanics with entirely new code. ArduinoGotchi takes a different approach: it uses TamaLIB to emulate the processor and hardware behavior of first-generation Tamagotchi devices, then connects that emulated machine to Arduino-specific display, input, timing, sound and storage code.
The project targets a compatible first-generation P1 ROM. The ROM is converted into a C header and compiled with the firmware, so the original machine logic—not merely a similar set of rules—drives the pet.
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- START CODING WITH THE ELEGOO UNO R3: Connect the included USB cable, upload your first sketch, and build sensor, motor, display, and automation projects, making it a practical controller for maker desks, classrooms, coding clubs, and robotics labs
- ATMEGA328P CORE FOR EVERYDAY PROJECTS: A 16 MHz clock, 32 KB flash, 14 digital I/O pins with 6 PWM outputs and 6 analog inputs provide a versatile foundation for LEDs, buttons, relays, servos, displays and sensors
- RELIABLE USB PROGRAMMING AND CLEAR WIRING: The ATmega16U2 USB interface supports sketch uploads and serial communication, while clearly labeled headers help simplify connections to jumper wires, shields and modules
- POWER AND EXPAND YOUR WAY: Run the board from USB or a recommended 7-12 V external supply, then add compatible shields and modules for data logging, automation, robotics, test fixtures and custom electronics projects
- BOARD AND USB CABLE INCLUDED: Comes with 1 ELEGOO UNO R3 development board and 1 USB-A to USB-B data cable; breadboard, sensors, shields and power adapter are not included, and younger learners should work with an experienced adult
| Project type | Original machine logic? | ROM required? | Example |
|---|---|---|---|
| True emulator | Yes | Usually | ArduinoGotchi |
| Tamagotchi-style game | No | No | New virtual-pet firmware |
| Hardware replacement | Sometimes | Often | Modified original shell |
| Emulator port | Yes | Usually | ESP32 TamaLIB builds |
TamaLIB describes itself as hardware-agnostic and identifies the original P1/P2 family as using an Epson E0C6S46-based machine and a 32×16 monochrome display with eight icons. ArduinoGotchi supplies the UNO implementation around that core. See TamaLIB and the ArduinoGotchi repository.
What the UNO has to cope with
An official Arduino UNO Rev3 uses a 16 MHz ATmega328P with 32 KB of flash, 2 KB of SRAM and 1 KB of EEPROM; 0.5 KB of flash is occupied by the bootloader. It provides 14 digital I/O pins, six analog inputs and 5 V logic. Those limits explain both the achievement and the compromises of the port. The ROM and emulator must fit in flash, runtime data must fit in very little SRAM, rendering must remain lightweight, and save writes should be limited to protect EEPROM life. Specifications are listed by Arduino.
- Expect operation to be somewhat slower than an original Tamagotchi.
- The published default saves state about every 60 minutes, so a reset can erase progress made since the last save.
- The UNO is physically large for a pocket pet and lacks the deep-sleep, battery-management and memory headroom normally associated with ESP32 projects.
Parts and software
Electronics
| Part | Quantity | Purpose |
|---|---|---|
| Arduino UNO or ATmega328P-compatible board | 1 | Runs the emulator |
| SSD1306 128×64 I²C OLED | 1 | Modern display replacement |
| Normally open momentary push buttons | 3 | A, B and C controls |
| 1 kΩ resistors | 3 | Used in the published button circuit |
| Small buzzer or piezo element | 1 | Sound output |
| Breadboard, jumper wires and USB cable | As needed | Assembly and programming |
The component list is documented by the Arduino Project Hub overview and the published build instructions.
Rank #2
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- ATmega328P Microcontroller: Powered by the reliable ATmega328P, running at 16 MHz with 32KB of flash memory, 2KB SRAM, and 1KB EEPROM, offering ample resources for a wide range of basic to advanced electronics projects.
- 14 Digital I/O Pins & 6 Analog Inputs: Features 14 digital I/O pins (6 of which support PWM output) and 6 analog inputs (10-bit resolution), providing flexible options for sensors, motors, and other external components.
- USB Connectivity for Easy Programming: The built-in USB port allows for direct programming and serial communication, enabling a simple connection to your computer for sketch uploading and debugging through the Arduino IDE.
- Compatible with Arduino IDE: Full compatibility with the Arduino IDE ensures easy access to a vast array of libraries, code examples, and community-driven projects, making the Uno a great choice for both beginners and experienced makers.
- Widely Used in Education & Prototyping: The Arduino Uno is a standard in educational environments, widely used for learning and teaching electronics and programming. It's perfect for prototyping, robotics, IoT projects, and more.
Software
- Git
- Arduino IDE
- Arduino AVR Boards package
- Java 8 for the ROM converter
- U8g2, installed through the Arduino Library Manager
- The ArduinoGotchi source tree
- A compatible P1 ROM obtained and used lawfully
U8g2 is an open-source dependency; its project is at github.com/olikraus/u8g2.
Wiring the hardware safely
Use the project’s circuit diagram and source definitions for the exact button and buzzer pins. The published pages establish the parts and display configuration but do not provide a reliable text pinout for every signal; do not invent pin assignments or substitute an assumed pull-up circuit.
- On a standard UNO, I²C is exposed on A4 (SDA) and A5 (SCL), alongside the OLED’s VCC and GND connections.
- The published firmware expects
DISPLAY_I2C_ADDRESS 0x3C, but some modules use another address. - Connect the three buttons and their 1 kΩ resistors exactly as shown in the project’s schematic and code.
- Connect the buzzer to the defined output and ground; use a low-current piezo rather than a speaker that could overload an I/O pin.
UNO logic is 5 V. Check the OLED breakout’s rated supply and whether it includes regulation or I²C level shifting. An unbranded board is not automatically 5 V-safe; use level shifting and the manufacturer’s supply recommendations when required. Before powering up, check polarity, shared ground, shorts and reversed SDA/SCL.
Rank #3
- Unlock your creativity with the versatile UNO R3 Board ATmega328P! Explore endless possibilities in electronics projects with its user-friendly Arduino development environment, extensive digital and analog I/O pins, and compatibility with various sensors and modules. Let your imagination soar!
- Experience the power of UNO R3 Board ATmega328P! This feature-packed development board boasts a high-performance ATmega328P microcontroller, 32KB of flash memory, and 2KB of SRAM. It's perfect for both beginners and advanced users seeking to build innovative applications in robotics, home automation, and more.
- Ignite your passion for electronics with the UNO R3 Board ATmega328P! Its open-source design allows for customization, while its 14 digital I/O pins and 6 analog input pins provide ample connectivity options. Get ready to bring your ideas to life and create interactive projects like never before.
- Elevate your DIY projects with the UNO R3 Board ATmega328P! This highly versatile development board offers seamless integration with the Arduino ecosystem, providing access to a vast library of code and resources. With its reliable performance and broad compatibility, you can easily prototype and realize your electronic dreams.
- Discover the endless potential of the UNO R3 Board ATmega328P! With its robust communication interfaces, including UART, SPI, and I2C, you can connect and communicate with a wide range of devices. Whether you're a hobbyist or a professional, this powerful development board is a must-have for creating innovative and interactive electronic systems.
Build and upload procedure
- Install Git, Arduino IDE, Java 8 and the Arduino AVR Boards package if necessary.
- In Arduino IDE, open the Library Manager through Sketch → Include Library → Manage Libraries, search for
U8g2and install it. Menu wording can vary by IDE release. - Clone the project:
git clone https://github.com/GaryZ88/ArduinoGotchi cd ArduinoGotchi
- Place your compatible first-generation ROM in that directory with the exact filename
rom.bin. - Run the converter from the project directory:
java TamaRomConvert rom.bin
A successful run should create
rom_12bit.h. - Wire the OLED, buttons and buzzer from the project’s schematic, then open
ArduinoGotchi.ino. - Select Tools → Board → Arduino AVR Boards → Arduino UNO, connect the board by USB and click Upload.
- On first boot, configure the clock with the middle button. The pet will not become active until this initialization is completed.
The converter and configuration files are maintained in the project repository; the step sequence is also published at Hackaday.
ROM ownership and licensing
ArduinoGotchi does not include the ROM because of copyright concerns. The firmware is therefore not a complete, legally neutral download. Obtain ROM data only through methods permitted in your jurisdiction; rules for personal backups, dumping and emulator use differ by country. Do not use unofficial ROM-download links as a substitute for a lawful source.
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Rank #4
- START CODING WITH A FLEXIBLE UNO R3 BOARD: Connect the included USB cable, upload sketches with Arduino IDE and build sensor, motor, display and automation projects for maker desks, classrooms, coding labs and electronics prototyping
- ATMEGA328P CORE FOR EVERYDAY PROJECTS: A 16 MHz clock, 32 KB flash, 2 KB SRAM, 1 KB EEPROM, 14 digital I/O pins with 6 PWM outputs and 6 analog inputs support LEDs, buttons, relays, servos, displays and sensors
- CH340C USB-TO-SERIAL INTERFACE: The onboard CH340C handles USB communication for sketch uploads and serial monitoring, while clearly labeled digital, analog and power headers help simplify wiring to modules and shields
- USB OR EXTERNAL POWER: Run the board from the included USB cable or a recommended 7-12 V external DC supply, then expand with compatible shields and modules for robotics, data logging, automation and custom embedded projects
- BOARD AND USB CABLE INCLUDED: Comes with 1 ELEGOO UNO R3 controller board and 1 USB-A to USB-B data cable; breadboard, jumper wires, sensors, shields and power adapter are not included
Important firmware settings
The published configuration includes:
#define DISPLAY_I2C_ADDRESS 0x3C #define SCREEN_WIDTH 128 #define SCREEN_HEIGHT 64 #define TAMA_DISPLAY_FRAMERATE 3 #define ENABLE_TAMA_SOUND #define ENABLE_AUTO_SAVE_STATUS #define AUTO_SAVE_MINUTES 60 #define ENABLE_LOAD_STATE_FROM_EEPROM
The 60-minute interval is a deliberate EEPROM-wear trade-off. A shorter interval reduces potential lost progress but increases writes; a longer interval does the reverse. Optional serial debugging, state dumping, hardcoded state and display-orientation settings are also present. Normal, 180-degree rotated and mirrored modes are documented; vertical mirroring is not supported by the stated U8g2 setup.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting by symptom
Blank OLED
- Confirm power, ground and SDA/SCL orientation.
- Run an I²C scanner and check for
0x3Cor the address reported by the module. - Verify the controller is SSD1306 and the resolution is 128×64.
- Test the module with a minimal U8g2 example before debugging the emulator.
Buttons do nothing
Check switch orientation, common ground, resistor placement, the pin definitions in the sketch and whether a button is being held during boot. Do not change pins without changing the matching firmware definitions.
Java conversion fails
Run java -version and ls in the repository directory. Confirm Java 8 is available, that the directory contains rom.bin and the converter files, that the filename is exact, and that the ROM is a complete expected binary. Newer Java releases are not guaranteed by the published instructions.
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- TURN CODE INTO REAL-WORLD RESULTS — Follow 22+ guided lessons to make LEDs blink, read temperature and distance, move servo and stepper motors, control an LCD and respond to joystick or IR input; ideal for a family weekend build, homeschool unit, coding club or STEM classroom
- MORE PROJECT VARIETY IN ONE ORGANIZED KIT — Includes the UNO R3 controller, LCD1602 with pre-soldered header, breadboard power module, ultrasonic and DHT11 sensors, joystick, IR receiver and remote, SG90 servo, stepper motor, relay, DC motor, fan blade, displays, LEDs, buttons, resistors and jumper wires
- START WITHOUT SOLDERING — Plug-in modules, a solderless breadboard and the pre-soldered LCD help beginners focus on wiring, code and testing; the illustrated component list makes it easier to find each part and move from one lesson to the next
- LEARN THE LOGIC, THEN CREATE YOUR OWN — Use Arduino IDE and the included example code to understand digital input and output, analog sensing, timing, motor control and display functions, then change thresholds, speeds and sequences for alarms, environmental monitors, reaction games and motion projects
- CLEAR SETUP SUPPORT FOR FIRST-TIME BUILDERS — Download the latest tutorial and code, select the UNO board and correct computer port, check component polarity and breadboard rows, and keep power-module input at 9V or below; younger learners should work with an experienced adult
Compile or memory errors
- Select the intended UNO board target.
- Ensure
rom_12bit.hexists. - Remove duplicate libraries.
- Disable optional features and verbose debug strings.
- Avoid large arrays, dynamic allocation and added graphics.
The pet never activates
Set the clock with the middle button. This is required initialization, not necessarily a failed upload.
Progress disappears
With the default setting, state is written approximately hourly. A reset or power cut before that write can lose recent activity.
No sound
Check the buzzer pin, ground, polarity where relevant, and that ENABLE_TAMA_SOUND is defined. Arduino specifies 20 mA as the recommended per-pin operating current and 40 mA as a limit that must not be exceeded; use a small piezo rather than a high-current load.
UNO or ESP32?
| Choose UNO when… | Choose ESP32 when… |
|---|---|
| You want the original P1 emulation challenge and a simple AVR workflow. | You need battery operation, sleep modes, more memory or a smaller finished enclosure. |
| A breadboard or desktop build is acceptable. | You want flexible controls, a LiPo charging path or a polished portable case. |
| Wireless features are unnecessary. | You are comfortable with different voltage, power and build tooling. |
The TamagotchiESP32 fork documents ESP32/ESP8266 support, experimental deep sleep, flexible button configuration, a 128×64 OLED option, battery hardware and a 3D-printable case path. The Hackaday instructions also describe source-level compatibility with Arduino Micro, Nano and Mega, but each board variant still needs its own pin, bootloader and power checks.
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Is this project right for you?
- Choose ArduinoGotchi on UNO if authentic P1 behavior, emulation internals and tight resource constraints are part of the appeal.
- Choose ESP32 if portability, sleep and expansion matter more than reproducing the UNO limitation.
- Write a custom virtual pet if you have no lawful ROM source or want new mechanics, sensors, color graphics, Wi-Fi or unrestricted game design.
ArduinoGotchi is a real and unusually ambitious UNO project, but its success depends on accepting the missing ROM, the constrained memory, the slower timing, the hourly save policy and the practical limits of a breadboard-sized 5 V board.
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