Scribble Bot.

TEAM Number -		4
#	Questions	Answers	Objective	Function	Constraint
1	What is the primary purpose of the robot?	Create doodles and geometric patterns on paper		✓
2	How should the bot hold the markers/pens?	Grip 1 to 3 sketch pens firmly at an adjustable angle.		✓
3	What mechanism creates the movement?	Motor with eccentric mass or dual gear motors.		✓
4	What is the maximum allowable budget?	Total cost must not exceed ₹2500-3000.			✓
5	What is the power source?	Standard battery.	✓
6	What are the size and weight limits?	Must fit inside a 15*15 *15 cm box and must weigh under 600 grams.			✓
7	How should the robot be controlled?	Simple toggle switch (ON/OFF) or basic microswitch.		✓
8	How easy should it be to replace pens?	Tool-less quick release.	✓
9	What surface will it draw on?	Flat chart paper or whiteboards.			✓
10	How safe should the device be?	No exposed sharp edges or short circuits; safe for students/kids.	✓
11	How long should it run on a single charge/battery?	At least 20–30 minutes of continuous operation.			✓
12	What material should the chassis be made from?	Recycled or 3D printed chassis.	✓
13	How loud can the robot be during operation?	Operating noise should remain reasonably quiet for indoor use.	✓
14	What is the operating thermal limit for the motor and battery?	Surface temperature of the motor and battery must stay safe to touch during extended runs.	✓
15	How should the robot indicate when it is powered ON?	A small indicator LED wired across the power switch.		✓
16	How is the center of gravity balanced relative to pen tip friction?	Symmetric or adjustable weight distribution to ensure equal pen dragging resistance across all contact points.	✓
17	How easily can the robot be transported and stored?	Compact, self-contained envelope with no loose hanging wires or fragile protruding arms.	✓
18	How can power consumption be reduced?	Use efficient motors and control.	✓
19	How can communication with the controller be done?	USB or Bluetooth.		✓
20	How can pen height be adjusted?	Adjustable pen.	✓

Sl. No.	Objective	Description
1	Quick Pen Replacement	Tool-less quick release.
2	Safety	No exposed sharp edges or short circuits; safe for students/kids.
3	Operational Runtime	At least 20–30 minutes of continuous operation.
4	Chassis Material	Recycled or 3D printed chassis.
5	Acoustic Comfort	Operating noise should remain reasonably quiet for indoor use.
6	Thermal Limits	Surface temperature of the motor and battery must stay safe to touch during extended runs.
7	Power Indication	A small indicator LED wired across the power switch.
8	Dynamic Balance	Symmetric or adjustable weight distribution to ensure equal pen dragging resistance across all contact points.
9	Portability & Storage	Compact, self-contained envelope with no loose hanging wires or fragile protruding arms.
10	Power Optimization	Use efficient motors and control.
11	Controller Communication	USB or Bluetooth communication.
12	Pen Height Adjustability	Adjustable pen holder.

Problem Definition Version 1.1

Design and develop a safe, low-cost doodling robot that creates consistent patterns using standard pens. The device must feature a tool-less, adjustable pen holder, balanced weight distribution, and safe power-indication circuitry, providing at least 20–30 minutes of quiet operation using accessible chassis materials within strict size, weight, and budget limits

Sl. No.	Constraint Parameter	Specification / Limit
1	Budget Limit	Total cost must not exceed ₹2500-3000.
2	Dimensions & Envelope	Must fit inside a 15 × 15 × 15 cm box.
3	Total Weight	Must weigh under 600 grams.
4	Drawing Surface	Flat chart paper or whiteboards.
5	Operational Runtime	At least 20–30 minutes of continuous operation.

Problem Definition Version 1.2

The challenge is to design a pattern generating robot that operates on flat chart paper or whiteboards for at least 20–30 minutes, without exceeding a total budget of ₹2500-3000, a maximum envelope of 15 × 15 × 15 cm, or an overall weight of 600 grams.

Sl. No.	Function	Description
1	Autonomous Doodling	Create autonomous doodles and geometric patterns on flat drawing surfaces.
2	Pen Clamping & Alignment	Grip 1 to 3 sketch pens firmly at an adjustable angle.
3	Vertical Pen Adjustment	Adjust pen tip height and contact pressure against the drawing surface.
4	Locomotion & Actuation	Convert electrical energy into motion using a DC vibration motor with eccentric mass or dual DC gear motors.
5	Power Delivery & Regulation	Distribute low-voltage DC power from a 9V battery or 2×AA / 18650 Li-ion cells.
6	User Power Switching	Enable single-action manual ON/OFF state control via a toggle switch or basic microswitch.
7	Power Status Indication	Visually indicate active operational state via a small LED wired across the switch.
8	Friction & Load Balancing	Maintain uniform pen dragging resistance across all contact points through symmetric mass distribution.
9	Rapid Tool-less Release	Enable quick insertion, swapping, and removal of sketch pens without tools.
10	Controller Communication	Facilitate serial data exchange or control signal reception via USB or Bluetooth.

Problem Definition Version 1.3

There is a need to develop a functional robotic drawing platform that generates geometric patterns and doodles on flat surfaces. The system must integrate reliable motor actuation, an adjustable multi-pen clamping assembly, and a dedicated power-switching interface with visual LED indication, all coordinated to ensure balanced dragging resistance and stable motion across all pen contact points.

Design and develop a battery-operated doodling robot that securely grips 1 to 3 standard sketch pens with adjustable height and tilt to generate patterns on chart paper or whiteboards. The system must provide at least 20–30 minutes of continuous, low-noise operation powered by standard low-voltage cells, featuring balanced weight distribution and an integrated LED power indicator. The entire solution must be realized within a strict bill-of-materials budget of ₹2500-3000, fit inside a 15 × 15 × 15 cm volumetric envelope, and weigh under 600 grams.