Arduino Classroom Queue System

Overview

This Arduino application manages a classroom queue system using an LED matrix display and MQTT for communication. It allows students to join a queue, cancel their request, fetch queue updates, and notify when the instructor is away from the desk. The system interacts with an MQTT broker to receive and publish updates.

Features

• WiFi Connectivity: Connects to a WiFi network to communicate with the MQTT broker.
• MQTT Communication: Subscribes to an MQTT topic to receive student requests and publishes queue updates.
• LED Matrix Display: Displays the current ticket number, student name, and student number.
• Queue Management: Handles adding, removing, and updating students in the queue.
• Away Mode: Notifies students when the instructor is away.

Hardware Requirements

• ESP32 or compatible WiFi-enabled microcontroller
• 64x32 RGB LED Matrix
• WiFi network

Software Requirements

• Arduino IDE
• Required libraries:
  • WiFi.h
  • Adafruit_MQTT.h
  • Adafruit_MQTT_Client.h
  • ArduinoJson.h
  • Adafruit_GFX.h
  • P3RGB64x32MatrixPanel.h

Installation & Setup

1. Clone or download this repository.
2. Install the required libraries in the Arduino IDE.
3. Update config.h with WiFi and MQTT broker credentials.
4. Upload the code to your ESP32.

MQTT Topics

• Subscription: AIO_USERNAME/feeds/AIO_FEED_SUBSCRIBE
• Publishing: AIO_USERNAME/feeds/AIO_FEED_UPDATE

Functionality

• Connecting to WiFi: The wifi_connect() function establishes a WiFi connection.
• Connecting to MQTT: The MQTT_connect() function ensures a stable connection to the broker.
• Handling MQTT Messages: The loop() function listens for incoming messages and processes them accordingly.
• Displaying Information: The LED matrix displays the current queue status, including student details and ticket numbers.

Message Handling

• Add Student: Adds a new student to the queue.
• Cancel Ticket: Removes a student from the queue.
• Next Ticket: Moves to the next student in the queue.
• Fetch Queue: Sends an update request.
• Away Mode: Toggles the instructor's away status.