Final Project

1. Concept

The Room Status Device is a physical indicator system designed to display whether a room is Available or Busy.
It uses:

• A slide switch to select the room status
• A 16×2 LCD to display the message
• Optional computer UI integration (p5.js) for serial communication

The goal was to create a simple, intuitive way to communicate room availability without relying on software or mobile apps.

2. Images of the Project

3. Schematic

4. User Testing Videos

IMG_3536

5. How the Implementation Works

Interaction Design

The user simply toggles a slide switch:

• Up → AVAILABLE
• Down → BUSY

The device updates the LCD instantly.

When connected to the p5.js UI, the device also sends status updates via serial for digital mirroring.

6. Arduino Code + Snippets

#include <Arduino.h>
#include <LiquidCrystal.h>
#include "DisplayManager.h"
#include "Emoji.h"
#include "Wireless.h"

const uint8_t SWITCH_PIN = 6;
bool lastSwitchState = HIGH;  // because of INPUT_PULLUP

DisplayManager display(12, 11, 5, 4, 3, 2);
WirelessHandler wireless(display);

void onSwitchStatusChangedToAvailable() {
  wireless.handleCommand("AVAILABLE");
}

void onSwitchStatusChangedToBusy() {
  wireless.handleCommand("BUSY");
}

void setup() {
  display.begin();
  wireless.begin();
  
  pinMode(SWITCH_PIN, INPUT_PULLUP);
  lastSwitchState = digitalRead(SWITCH_PIN);
  
  // Apply initial switch state
  if (lastSwitchState == HIGH) {
    onSwitchStatusChangedToAvailable();
  } else {
    onSwitchStatusChangedToBusy();
  }
}

void loop() {
  wireless.handleWireless();
  
  // Check switch state
  bool reading = digitalRead(SWITCH_PIN);
  if (reading != lastSwitchState) {
    lastSwitchState = reading;
    
    if (reading == HIGH) {
      // Switch position mapped to AVAILABLE
      onSwitchStatusChangedToAvailable();
    } else {
      // Switch position mapped to BUSY
      onSwitchStatusChangedToBusy();
    }
  }
  
  display.update();
}

7. p5.js Code + Snippets + Embedded Sketch

Full code: https://github.com/Building-Ling/Room_Status_Device

8. Communication Between Arduino and p5.js

Summarize the protocol:

• Arduino prints: "AVAILABLE" or "BUSY"
• p5.js listens via Web Serial
• Pressing F triggers fullscreen

9. Aspects I am Proud Of

• Clean, minimal hardware design
• Professional file structure
• Tidy p5.js UI

10. AI Tool Referencing

Chatgpt
Cursor

11. Challenges + How You Overcame Them

Version control: Git

12. Future Improvements

Improve UI