Underactuated Gripper Design Kit with Arduino Uno + Servo
Underactuated Gripper Kit with Arduino Uno & Servo — Build an Adaptive Three-Finger Grasping Hand
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Design a robotic hand that wraps around objects of any shape — this kit teaches underactuation with two servos, passive spring-loaded joints, and force-sensitive resistors. Perfect for final-year engineering projects, robotics competitions, or advanced research on compliant grasping.
What You'll Build
You’ll assemble and program a three-finger gripper that conforms to objects without complex control algorithms. The underactuated design uses fishing line tendons and extension springs to passively adapt, while FSR sensors provide grip-force feedback displayed on an OLED. The result is a lightweight, adaptable end-effector for any robotic arm.
What You'll Learn
- Underactuated mechanism design: achieve multiple degrees of freedom with fewer actuators
- Force sensor integration and calibration using FSR 402 and Arduino
- Servo control with PCA9685 driver for precise tendon-driven actuation
- Real-time feedback systems with OLED display for grip force monitoring
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| MG996R Servo | 2 |
| FSR 402 | 3 |
| PCA9685 Driver | 1 |
| 0.96in OLED | 1 |
| 5V 3A PSU | 1 |
| Fishing Line 0.5mm | 3 |
| Extension Spring | 6 |
| 3D Printed Finger | 3 |
| M2 Bolts+Nuts | 30 |
| 100nF Caps | 5 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Designed for final-year engineering students (B.Tech Mechanical, ECE, Mechatronics) working on robotics projects, participants in Smart India Hackathon, and researchers exploring underactuated grasping. Also suitable for advanced hobbyists with prior Arduino experience at IITs, NITs, VIT, BITS, and ATL Tinkering Labs looking for a real-world compliant manipulator.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code on the box to access the AI companion for step-by-step guidance, or reach our team on WhatsApp for personalised support.
Is prior experience with Arduino required?
Yes, this is an advanced kit; you should be comfortable with Arduino IDE, wiring diagrams, and basic coding.
Can I mount this gripper on a standard robotic arm?
Yes, the base plate can be adapted to common mounting patterns. The design is lightweight and uses standard M2 hardware.
Are the 3D printed fingers durable enough for repeated testing?
The PLA fingers are sufficient for prototyping and demonstration. For heavier loads, you can re-print in PETG or ABS using the open-source STL files provided.
Three-finger gripper with only two servos achieves adaptive grasps using passive joints and spring returns.
What's in this kit
- Arduino Uno R3
- MG996R Servo x2
- FSR 402 x3
- PCA9685 Driver
- 0.96in OLED
- 5V 3A PSU
- Fishing Line 0.5mm x3
- Extension Spring x6
- 3D Printed Finger x3
- M2 Bolts+Nuts x30
- 100nF Caps x5
- Soldering Iron
- Solder Wire
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items