Project Hub /IoT & Connected Devices/Smart City & Infrastructure/QR Code-Based UI for Vending Machine, ATM and LIFT

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RASPBERRY PI

₹5,000 – ₹15,000

3 – 6 Hours

Partial Kit

QR Code-Based UI for Vending Machine, ATM and LIFT

Build a contactless mobile user interface for machines like ATMs and vending machines by scanning a printed QR code linked to a Raspberry Pi web server.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Raspberry Pi 3 - Model B+ 1.4Ghz 64-bit quad-core Processor with 1 GB Ram (Original) Rs. 5,400.00
5V 1 Channel Relay Module Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: LCD (generic / unspecified)

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How It Works

The QR Code-Based UI for Vending Machine, ATM and LIFT project transforms a standard Raspberry Pi 5 running Raspbian OS into a local web server capable of hosting a contactless mobile interface. To begin, an Apache Web Server is configured to process HTTP requests, while PHP and a Python script using the pyqrcode library dynamically generate and render QR codes. When a user scans the displayed QR code using their smartphone camera, their device connects to the Raspberry Pi's local web server over a network connection, loading a user interface directly in the mobile browser. Interacting with the buttons on the mobile interface triggers backend scripts that communicate with the Raspberry Pi's GPIO pins via WiringPi. These digital output signals toggle a relay module. Because the relay module acts as an electrically isolated electronic switch, it can safely trigger the higher-voltage control circuits typical of real-world physical machinery like vending machines, ATMs, or elevators. An initial display is used solely during the initial setup phase to configure the Raspberry Pi before deploying it as a headless server.

Why Build This

Design and deploy modern, touchless public-facing control systems for elevators, ATMs, and vending machines to minimize physical contact and germ transmission.

Integrate web technologies like Apache, PHP, and Python with physical hardware GPIO controls to build an end-to-end IoT system.

Implement safe electrical isolation techniques using relay modules to interface low-voltage microcontrollers with external machine control circuits.

Real-World Application

Contactless public interfaces for ATMs, elevators, and vending machines to reduce germ transmission and improve accessibility.

Skills You'll Learn

Raspbian OS administration

Apache web server configuration

PHP backend scripting

Python programming

pyqrcode library usage

WiringPi GPIO control

relay module interfacing

local network web routing

Safety Precautions

Ensure proper electrical isolation when interfacing low-voltage GPIO signals with high-voltage relays or machine components.

Technology Tags

PYTHON

PHP

APACHE

HTML

CSS

QR CODE

GPIO

WIRINGPI

CONTACTLESS UI

Frequently Asked Questions

Why do I need a display if the project uses a smartphone interface?

The display is only required during the initial setup phase to configure the Raspberry Pi 5 network settings and start the web server; once running, the smartphone serves as the active user interface.

How does the smartphone communicate with the Raspberry Pi?

The smartphone connects via a local network to the Apache web server running on the Raspberry Pi after scanning the generated QR code, which directs the phone's browser to the correct local IP address and interface page.

What is the purpose of the relay module in this setup?

The relay module acts as an isolated switch controlled by the Raspberry Pi's low-voltage GPIO signals, allowing the system to safely trigger external machine controls without risking damage to the board.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-00361