Arduino-Based Vending Machine

A compact, Arduino-powered vending machine prototype developed as an Embedded Systems project at Al‑Balqa' Applied University.

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Overview

This repository contains all resources for a prototype vending machine, including hardware designs, firmware, documentation, and media. The system demonstrates a complete vending workflow, from coin validation to product dispensing.

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Features

• Coin Validation: Accepts and verifies coins using a load-cell and IR sensors.
• User Interface: 4×4 keypad for item selection and a 16×2 I²C LCD for prompts and status.
• Product Dispensing: Servo-driven mechanism for reliable item delivery.
• Custom Enclosure: Combination of wood and 3D-printed parts for structure and mounts.

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Repository Structure

.
├── LICENSE
├── README.md
├── circuit
│   └── vending Machine Diagram.fzz
├── code
│   └── Vending_Machine_Final.ino
├── images
│   ├── vm-0.png
│   ├── vm-1.jpg
│   ├── vm-2.jpeg
│   ├── vm-3.jpeg
│   ├── vm-4.jpeg
│   ├── vm-5.jpeg
│   ├── vm-6.jpeg
│   ├── vm-7.jpeg
│   ├── vm-8.jpeg
│   └── vm-9.jpeg
├── presentation
│   └── VM2.pptx
└── videos
    └── vm-0.mp4

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Hardware Components

Component	Qty	Description
Arduino Mega 2560	1	Main microcontroller
Servo motors	4	Item dispensing
Load-cell + HX711	1	Coin weight measurement
IR obstacle sensors	3	Coin speed and diameter detection
4×4 Keypad	1	User input
16×2 LCD (I²C)	1	Display
Wood panels & fasteners	—	Enclosure
3D-printed parts	—	Coin slot, mounts, decorative elements
Wiring, resistors, breadboard	—	Circuit interconnects

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Installation & Setup

1. Clone the repository

   git clone https://github.com/your-username/vending-machine-arduino-based.git
   cd vending-machine-arduino-based

2. Assemble the hardware

   • Follow the Fritzing diagram in circuit/vending Machine Diagram.fzz.
   • Mount sensors, servo motors, keypad, and LCD into the wooden frame.
   • Wire all components to the Arduino Mega as shown in the documentation (pp. 8–12).

3. Upload the firmware

   • Open code/Vending_Machine_Final.ino in the Arduino IDE.
   • Select “Arduino Mega 2560” and the correct COM port.
   • Install required libraries:
     • LiquidCrystal_I2C
     • Keypad
     • HX711
   • Upload the code to the board.

4. Power and test

   • Supply 5 V to the Arduino (USB or external).
   • Insert coins and use the keypad to select items.
   • Verify LCD prompts and servo operation.

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Usage

1. Startup: LCD displays a welcome message and item list.
2. Insert Coin: Machine measures coin; LCD shows accepted value.
3. Select Item: Enter item code (e.g., A1) on the keypad.
4. Dispense: Servo delivers the item; LCD thanks the user and resets.

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Project Timeline

• Nov–Dec 2023: Design, hardware integration, coin detection
• Jan 2024: Firmware development, testing, presentation
• Jan 2 2024: Final demonstration and report submission

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License

This project is released under the MIT License.