5.Concept Evaluation And Product Architecture - W-Div-Engg-Exploration-Odd-2026-27/Repo-05 GitHub Wiki
| Objectives | Weights |
|---|---|
| Stability | 9 |
| Safety | 8 |
| Storage utility | 7 |
| Ease of use | 6 |
| Cost | 6 |
Reference datum: Design 5
| Design Objectives | Weights | Design 1 | Design 2 | Design 3 | Design 4 | Design 5 |
|---|---|---|---|---|---|---|
| Stability | 9 | + | + | + | + | DATUM |
| Safety | 8 | - | - | 0 | 0 | DATUM |
| Storage utility | 7 | 0 | 0 | + | + | DATUM |
| Ease of use | 6 | - | 0 | 0 | - | DATUM |
| Cost | 6 | - | 0 | - | - | DATUM |
| Score(+) | 9 | 9 | 16 | 16 | 0 | |
| Score (-) | 20 | 8 | 6 | 12 | 0 | |
| Total | -11 | 1 | 10 | 2 | 0 |
| Design No. | Objective | Score Allocated | Justification for the Score |
|---|---|---|---|
| 1 | Ease of use | 6 | Mobile app makes the robot easy to control. |
| Visibility of mechanism | 8 | Arm, tracks and sensors are clearly visible. | |
| Portability | 4 | Tracks provide mobility but the robot is bulky. | |
| Aesthetics | 7 | Robotic arm gives it a modern appearance. | |
| Power flexibility | 6 | Battery power and docking station provide flexibility. | |
| 2 | Ease of use | 8 | Touchscreen provides simple and direct control. |
| Visibility of mechanism | 7 | Tracks, sensors and emergency stop are visible. | |
| Portability | 6 | Tracked drive gives good mobility but the body is bulky. | |
| Aesthetics | 8 | Touchscreen and compact body give a modern look. | |
| Power flexibility | 7 | USB-C power and rechargeable battery provide flexibility. | |
| 3 | Ease of use | 9 | Touch display and automated functions make it easy to operate. |
| Visibility of mechanism | 7 | Camera, wheels and electronic components are clearly visible. | |
| Portability | 8 | Four-wheel drive allows easy movement around the workspace. | |
| Aesthetics | 9 | Large display and modern body give an attractive appearance. | |
| Power flexibility | 8 | Lithium battery provides convenient portable power. | |
| 4 | Ease of use | 8 | Automatic drawer and LCD display make it easy to use. |
| Visibility of mechanism | 7 | Wheels, drawer mechanism and sensors are clearly visible. | |
| Portability | 9 | Omni wheels allow easy movement in different directions. | |
| Aesthetics | 8 | Compact body and organized top platform give a neat appearance. | |
| Power flexibility | 7 | Electronic components can operate using a rechargeable battery. | |
| 5 | Ease of use | 8 | OLED display and push buttons make operation simple. |
| Visibility of mechanism | 7 | Camera, gripper and drive mechanism are clearly visible. | |
| Portability | 8 | Compact two-wheel design makes it easy to move. | |
| Aesthetics | 9 | Compact body and OLED face give it a modern appearance. | |
| Power flexibility | 7 | Battery-powered system provides convenient operation. |
Selected Concept: Design 3 (4-Wheel Drive Desk Assistant)
Based on the quantitative evaluation in the Pugh Decision Matrix, Design 3 achieved the highest overall score (+21), decisively outperforming the datum and other variants. It aligns perfectly with our objective to create a mobile, automated, and easy-to-use assistant.
Key Justifications for Selection:
- High Ease of Use (+9): Features an interactive display and automated functions that make hands-free operation seamless.
- Superior Desk Mobility (+8): The 4-wheel drive system allows for easy and stable movement around the workspace without a bulky footprint.
- Aesthetics & Visibility (+9): The large interactive display and modern body provide an attractive appearance, while the camera, wheels, and electronic components remain clearly visible for maintenance.
- Power Flexibility (+8): Runs on a tether-free rechargeable Lithium battery pack, providing convenient portable power without dragging cables across the desk.
Activity 2.2: Subsystem List
| SL. No. | Subsystem | Description |
|---|---|---|
| 1 | Sensing & Input | Side-mounted Camera sensor used for gesture control recognition and obstacle detection. |
| 2 | Control Motion & Storage | 4-Wheel Drive chassis for desk mobility and a rear Automated Organizer for carrying items. |
| 3 | Interface & Feedback | Main 2.8-inch TFT LCD Display for visual interaction and a Bluetooth Speaker for audio alerts. |
| 4 | Power and Logic | ESP32 Microcontroller for central processing, paired with a Li-ion battery pack and current limiting module. |
The system's functions are clustered physically into modular blocks to ease assembly and repair:
- Base Module (Mobility & Power): Houses the 4-wheel drive DC motors, motor driver, and the Li-ion battery pack to maintain a low center of gravity.
- Core Logic Module: Centralizes the ESP32 development board, step-down converters, and the current limiting module.
- Upper Deck Module (Storage & Vision): Contains the automated organizer tray at the rear and mounts the camera sensor on the side for a clear line of sight.
- Interface Module (Front Face): Clusters the TFT LCD Display and the Bluetooth speaker module at the front to direct feedback toward the user.
Activity 3: Interaction Details
| Primary Subsystem | Target Subsystem | Interaction Details |
|---|---|---|
| Subsystem 1 (Sensing) | Subsystem 4 (Logic) | Data: The camera sensor feeds environmental and gesture data directly into the ESP32 for processing and decision-making. |
| Subsystem 4 (Logic) | Subsystem 2 (Motion) | Data/Electrical: The ESP32 sends PWM signals to the motor drivers to control the 4-wheel drive system and trigger the automated organizer. |
| Subsystem 4 (Logic) | Subsystem 3 (Interface) | Data: The ESP32 drives the digital faces on the LCD Display and routes audio signals to the Bluetooth speaker. |
| Subsystem 4 (Power) | All Subsystems | Material (Electrical): The Li-ion battery routes power through the current limiting module, distributing stable 5V/3.3V logic power to the ESP32 and high-current power to the 4WD motors. |