02 GATHERING PERTINENT INFORMATION - Q-div-Engg-Exploration-2026-27-Odd/Repo-5 GitHub Wiki
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Design Evaluation – Existing Prototype vs Proposed Scribble Bot
| Evaluation Parameter | Existing Scribble Bot (Flaws) | Our Proposed Scribble Bot (Improvements) |
|---|---|---|
| Motion & Trajectory | Movement depends mainly on the rotating/vibrating body, making the drawing path difficult to control and repeat accurately. | Controlled X–Y movement using guide rails and motor-driven linear mechanisms for precise and repeatable drawing paths. |
| Drawing Accuracy | Produces irregular and unpredictable patterns because the position of the pen is not directly controlled. | X–Y coordinate-based movement allows accurate geometric shapes, patterns, letters and numbers to be generated. |
| Pen Attachment & Swapping | Markers are fixed around the body using a simple mounting arrangement, making replacement and adjustment inconvenient. | Dedicated quick-release pen holder allows easy insertion, removal and replacement of different pens or markers. |
| Pen Height & Contact Control | Pen contact with the paper depends on the physical arrangement of the markers and body, giving limited control over pressure. | Servo-controlled pen-lift mechanism with adjustable holder maintains controlled contact between the pen and drawing surface. |
| Multi-Pen Capability | Multiple markers are attached around the body, but their positions and contact with the paper are difficult to control independently. | Modular pen carriage can support controlled pen positioning and allow different pens/markers to be used for drawing. |
| Structural Stability | The cylindrical body and externally mounted markers can shift during operation, affecting the consistency of the drawing. | Rigid base and guided carriage provide better structural stability and maintain fixed alignment during drawing. |
| Surface Adaptability | Performance depends on the friction between the body, markers and drawing surface, which can affect movement. | A dedicated drawing platform provides a stable reference surface and controlled movement over the paper. |
| Control & Programming | Limited direct control over the exact drawing path and movement of individual components. | Microcontroller-based control converts programmed coordinates into coordinated X–Y motor and pen movements. |
| Feedback & Positioning | No dedicated position feedback mechanism is visible, making it difficult to determine the exact position of the drawing mechanism. | Position/limit feedback can be incorporated to establish reference positions and improve drawing accuracy. |
| Power & Safety | Basic wiring and power arrangement can make operation and switching less convenient. | Integrated power distribution and controlled ON/OFF operation provide safer and more organized electrical operation. |
| Reliability | Small changes in friction, marker position or body movement can change the resulting pattern. | Guided mechanical motion and coordinated electronic control improve repeatability and reliability. |
| Ease of Use | Marker arrangement and manual setup are required before operation. | User can provide a programmed drawing pattern and the system automatically performs the required X–Y movements. |
| Portability | Compact and lightweight, but the exposed markers and body require careful handling. | Modular and structured construction allows the robot to be assembled, transported and set up systematically. |
| Drawing Quality | Produces creative scribble patterns but has limited control over line smoothness and shape dimensions. | Controlled motion produces smoother, cleaner and more consistent lines, shapes and programmed patterns. |
| Overall Performance | Suitable as a basic demonstration of an automated scribbling concept but has limited control and repeatability. | Provides a more precise, programmable and mechanically controlled Scribble Bot suitable for accurate drawing and writing tasks. |