🤖 ChatGPT-Generated Robot Design Specification (Draft Ver. 1)
🧾 [1. Basic Robot Specifications]
Operating Environment
Indoor use (flat floor, no steps)
Primary Objectives
Learning ROS 2
Experimenting with LiDAR-based odometry
Exploring AI-driven hardware creation
Size and Weight Constraints
Focus on compactness
Total weight under 1.5kg
Mobility System
2-wheel drive + ball caster (no robotic arm)
⚙️ [2. Component List and Weight]
Section Component (Notes) Weight (g)
Head Pi Camera Module 3 (ROS 2 compatible camera) 4
Neck MG90S × 2 (ROS 2-compatible servos) 26.8
Body RPLIDAR A1 (ROS 2 LiDAR) 170
Raspberry Pi 5 + Case (Main controller) 100
Heatsink (Passive cooling, to be designed) —
Pololu D24V50F5 (DC-DC converter) 4.5
TB6612FNG (Motor driver) 20
Drive Tamiya Twin Gearbox (Gear ratio to be selected) 120
Tamiya Sports Tires ×2 (Drive tires) 62
Tamiya Ball Caster (Stability assist) 10
Power LF2200-6.6V LiFe battery 220
Total Weight (excluding minor components): ~737g
Estimated spare weight: ~700g — should stay under 1.5kg with chassis, wiring, and fasteners included.
🔌 [3. Power Configuration]
Main Power
LiFe Battery (6.6V 2200mAh)
Power Distribution
5V regulated output via Pololu D24V50F5
Raspberry Pi Cooling
Passive heatsink (optional fan if needed)
Estimated Peak Current Draw
Up to 2A (estimate, needs verification)
📡 [4. Sensor & Control System]
LiDAR: RPLIDAR A1 (ROS 2 compatible)
Camera: Pi Camera Module 3 (supports face/object recognition)
Servo Control: MG90S × 2 (for head movement, potential for face tracking)
Motor Driver: TB6612FNG (controls 2 DC motors)
Main Controller: Raspberry Pi 5 (ROS 2 Jazzy compatible)
🧊 [5. Thermal Management]
Raspberry Pi 5: Passive heatsink + ventilation slits; fan considered if necessary
Motor Driver: Natural cooling; ensure clearance for airflow
LiFe Battery: Minimal heating under normal use; monitor during charging or replacement
🔧 [6. Mechanical Design]
Drive System: Tamiya gearbox + sports tires
Stability: Three-point support using ball caster
Center of Gravity: Positioned low using battery and motors
Chassis Material: TBD (lightweight, 3D-printed recommended)
Cable Routing: Split-level or routed within frame
📈 [7. Points to Review (AI-Identified Design Considerations)]
[ ] Verify the cooling efficiency of the heatsink during prototyping (Raspberry Pi 5 tends to run hot)
[ ] Ensure the servo movement range fits within the neck structure (check angle limits)
[ ] Define clear procedure for battery removal and charging
[ ] Run weight and center-of-gravity simulations in FreeCAD
[ ] Plan cable routing for LiDAR, camera, and servos