Guess the Weight is a recreational device that uses a digital scale to create an interactive and fun experience. The game features two distinct modes:

An object is placed on the scale and weighed. The player must then try to guess the weight by inputting a value as close as possible to the actual measurement.

An object is weighed and its weight is stored. The player is then given several smaller objects of known weights. The goal is to recreate the original weight by placing a combination of these objects on the scale.

Both modes encourage observation, estimation, and logical thinking while offering a fun and hands-on interaction with real-world measurements.

A brief overview of our project:

• The project features two game modes based on weighing an object.
• The goal is to provide a fun and interactive experience for the user.
• The initial idea was to create a functional scale.
• It is useful as it results in a device that can be used for entertainment purposes.

The “Guess The Weight” system consists of the following main modules:

• Weight Sensor Module (Load Cell + HX711) – measures the weight of the object placed on the scale.
• Microcontroller (Arduino Mega 2560) – manages the game logic and communicates with all other components.
• Display Module (OLED or alternative) – shows instructions, game mode, weight, and messages for the user.
• 4×3 Keypad – allows the user to interact with the system and input values.
• Passive Buzzer – provides audio feedback during the game (e.g., success/failure sounds).
• Power Supply (via USB from a laptop) – powers the entire system through the Arduino board.

Interaction Description:

• The user selects a game mode using the 4×3 keypad.
• The system prompts the user with instructions on the OLED display.
• The user places an object on the load cell.
• The HX711 module sends the weight data to the Arduino via digital communication.
• Arduino processes the data and checks if the condition for the current game mode is met.
• The display and buzzer have different actions depending of the game mode selected.

# Components List

'Interface:' Digital serial communication (2 wires - DT and SCK)

'Connections:' * VCC → 5V Arduino * GND → GND Arduino * DT → D2 (digital input) * SCK → D3 (digital output)

'Voltage:' 5V logic Note: No level shifting needed; both HX711 and Mega operate at 5V logic

'Interface:' PWM or simple digital ON/OFF signal

'Connections:' * Pin + (red) → D9 (PWM digital pin) * Pin - (black) → GND

'Voltage:' 5V Note: Directly compatible with Arduino Mega digital outputs

'Interface:' I2C (2 wires)

'Connections:' * VCC → 5V * GND → GND * SCL → Pin 21 (SCL on Mega) * SDA → Pin 20 (SDA on Mega)

'Voltage:' 3.3V–5V Note: No conversion needed; internal protection resistors present

'Interface:' Digital, column and row scanning (8 pins)

'Connections:' * 8 wires connected to digital pins D22–D29

'Voltage:' 5V Note:' Passive mechanical switches using internal pull-up resistors

'Powers:' * OLED Display * Buzzer * HX711

'Power Source:' USB AM-BM connected to Arduino Mega Note:' 5V and GND lines distributed on both sides of breadboard

Both the display and the buzzer works, the dislpay can be seen in the picture, as for the buzzer, it was tested using a script.

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