International Journal of Advanced Research in Computer and Communication Engineering

Abstract: This project presents the development of a multifunctional smart vending machine capable of dispensing beverages and items using voice commands, coin validation and UPI-based digital payments. The system is built around an Arduino Mega controller and integrates an HC-05 Bluetooth module for wireless voice operation, relay-driven motor pumps for dispensing hot milk, cold milk, and decoction, and a DC motor with a spring-based mechanism for item dispensing. A webcam-driven coin detection system enables the machine to accept only ₹10 coins while rejecting all invalid denominations.

The vending machine supports dual operating modes: voice-controlled operation via a mobile application and manual operation through four dedicated buttons for hot coffee, cold milk, item dispensing, and Wi-Fi activation. A Wi-Fi dongle provides 330 seconds of internet access per recharge, ensuring reliable connectivity for UPI transaction verification. The machine dispenses beverages or items only after confirming successful payment; otherwise, it returns the coin and aborts the process. A 16×2 LCD display provides real-time updates, including payment status, beverage selection, and Wi-Fi activation timing.

Overall, the proposed system delivers a cost-effective, automated, and user-friendly vending solution suitable for cafeterias, hostels, offices, and public environments, offering enhanced convenience through hybrid payment support and smart control functionality.

Keywords: Smart Vending Machine, Voice Control, UPI Payment, Coin Detection, Arduino Mega, HC-06 Bluetooth, Motor Pump, Wi-Fi Automation.

Downloads: | DOI: 10.17148/IJARCCE.2025.1411139