02. GATHERING PERTINENT INFORMATION - Q-div-Engg-Exploration-2026-27-Odd/Repo-4 GitHub Wiki
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| Evaluation Parameter | Existing DIY Scribble Bot (Flaws) | Our Proposed Doodling Bot (Improvements) |
|---|---|---|
| Motion & Trajectory | Chaotic vibration causing random skips, uncontrollable drift, and leaving the page entirely. | Controlled rotary drive with balanced eccentric weighting, generating structured hypocycloid spirals, smooth looping arcs, and predictable circular paths. |
| Pen Attachment & Swapping | Pens taped or glued permanently; replacing dried markers or switching colors tears the structure apart. | Tool-less quick-release collar mechanism allowing rapid marker changes without tools. |
| Height & Tip Pressure Control | Fixed vertical height; pen tips wear down unevenly, causing loss of paper contact or excessive gouging. | Adjustable pen holder to fine-tune vertical tip elevation and contact pressure against the drawing surface. |
| Multi-Pen Capability | Typically restricted to holding only identical pens that double as structural legs. | Dedicated clamp capable of securing 1 to 3 sketch pens radially at adjustable angles and offsets. |
| Chassis Stability & Load Distribution | Structural weight bears directly onto pen tips, producing unequal drag, binding, and chassis tipping. | Center of gravity is balanced symmetrically across a dedicated rotary base, preventing tip-over while maintaining uniform surface traction. |
| Surface Adaptability | Stalls or skips when transitioning across different surface textures due to unmanaged tip friction. | Optimized for smooth, low-friction rotational operation across both flat chart paper and dry-erase whiteboards. |
| Power Switching & Safety | No power switch; requires manual, hazardous wire twisting or pulling battery terminals, risking short circuits. | Integrated low-resistance toggle or microswitch for safe, single-action ON/OFF power control. |
| Power State Indication | No visual state feedback; active status cannot be confirmed when stationary or stalled, leading to battery drain. | Dedicated low-power LED indicator wired across the switch to clearly display operational status. |
| Thermal & Acoustic Performance | Unshielded motors run hot during continuous cycles and create loud, harsh vibrations on desks. | Motor/battery temperatures remain safe to the touch, with dampeners keeping rotary noise smooth and quiet for indoor use. |
| Battery Life & Efficiency | Inefficient direct motor loading rapidly exhausts weak 9V cells within 5 to 10 minutes. | Optimized rotary power transmission using standard cells (9V, AA, or 18650) delivering 20–30 minutes of continuous runtime. |
| Portability & Wiring | Loose, exposed hanging wires and protruding limbs prone to snagging and breaking during transit. | Self-contained, compact cylindrical/envelope design under 15×15×15 cm and under 600 g with enclosed wire routing. |
| Budget & Cost Feasibility | Often uses wasteful disposable kits or poorly sourced parts with hidden replacement costs. | Built entirely from accessible, low-cost structural materials (acrylic/recycled discs) strictly within ₹2000. |