Wally Robotic-Arm Extension: A Robot That Grabs, Not Just Moves

🦾 Wally Robotic Arm — From Moving to Grabbing

🔧 Parts List

• Servo SG90 × 4 (base + shoulder + elbow + gripper)
• 3D-printed / acrylic arm structure
• U-bracket / couplers / connectors
• Extra DuPont extension wires

⚙️ Servo Control Principle

• PWM pulse-width controls precise angle (0°~180°)
• 0.5ms → 0° / 1.5ms → 90° / 2.5ms → 180°

🎯 Application Scenarios

Project	Description	Difficulty
Auto-sort	Sort by color/shape	⭐⭐⭐
Item carry	Pick from A, place at B	⭐⭐⭐
Chess play	Arm plays chess	⭐⭐⭐⭐
Write/draw	Hold a pen to draw	⭐⭐⭐⭐⭐