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Pololu 3551 Micro Gripper Kit with Position Feedback Servo
The Pololu 3551 Micro Gripper Kit is a compact robotic gripper system featuring integrated position feedback servo control, designed for precision manipulation in constrained spaces. Roboticists, automation engineers, and research professionals utilize this kit to develop dexterous robotic arms, pick-and-place systems, and collaborative robot end-effectors with real-time grip force monitoring. This product solves the critical challenge of achieving repeatable, feedback-controlled grasping in applications where space is limited and precise object manipulation is essential.
Product Overview
The Pololu 3551 Micro Gripper Kit integrates a high-torque servo motor with position feedback circuitry, enabling closed-loop gripper control with microsecond-level response times. The servo mechanism uses a precision gear train to convert rotational motion into linear gripper jaw movement, with integrated potentiometric feedback providing real-time position data to the control electronics. The kit includes pre-assembled gripper jaws with textured contact surfaces, a dedicated servo driver module with PWM input compatibility, and comprehensive firmware supporting both open-loop and closed-loop operation modes.
What distinguishes the Pololu 3551 is its exceptionally compact form factor measuring just 45mm x 35mm x 28mm, making it ideal for robotic hands and confined manipulation environments. The position feedback servo operates at 4.8-6V with a maximum grip force of 2.5kg, delivering 60-degree jaw opening range with 0.1mm positional accuracy. The integrated feedback system eliminates the need for external sensors, reducing system complexity and cost while improving reliability in production robotics, surgical instrument prototyping, and educational robotics projects.
Key Specifications
| Specification | Details |
| Product Type | Micro Gripper Kit with Position Feedback Servo |
| Brand | Pololu Robotics and Electronics |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Operating Voltage | 4.8V to 6V DC |
| Maximum Grip Force | 2.5 kilograms |
| Jaw Opening Range | 0 to 60 degrees |
| Positional Accuracy | 0.1 millimeters |
| Servo Speed | 0.15 seconds per 60 degrees |
| Feedback Type | Integrated potentiometric position sensor |
| Dimensions | 45mm x 35mm x 28mm |
| Weight | 65 grams |
| Control Interface | PWM signal input compatible with microcontrollers |
Key Features
- Integrated Position Feedback Servo with closed-loop control enabling real-time grip force monitoring and adaptive grasping strategies for fragile objects
- Compact Micro Form Factor at 45x35x28mm allows integration into robotic hands, surgical instruments, and space-constrained manipulation systems without bulk
- High Grip Force of 2.5kg combined with 60-degree jaw opening provides versatile object manipulation from delicate electronics to industrial components
- Precision Potentiometric Feedback delivers 0.1mm positional accuracy with microsecond response times, critical for repeatable pick-and-place operations
- PWM Control Interface ensures seamless integration with Arduino, Raspberry Pi, and industrial PLC systems using standard servo control protocols
- Pre-assembled Gripper Jaws with textured contact surfaces minimize object slippage while protecting delicate surfaces during manipulation
Applications and Use Cases
- Collaborative Robot End-Effectors where position feedback enables force-limiting grasping modes to ensure human-safe interaction in shared workspaces
- Surgical and Medical Robotics requiring millimeter-level precision and feedback control for minimally invasive instrument manipulation and tissue handling
- Educational Robotics Projects and university research programs developing multi-fingered robotic hands with feedback-controlled dexterous manipulation capabilities
- Automated Assembly and Pick-and-Place Systems for electronics manufacturing where precise object positioning and grip verification prevent product damage and assembly errors
- Drone Payload Manipulation where the lightweight 65-gram gripper enables aerial robots to grasp, transport, and release objects with real-time position confirmation
- Prosthetic Hand Development utilizing the integrated feedback mechanism to provide sensory feedback to amputees through neural interfaces
How to Use
Begin by connecting the Pololu 3551 Micro Gripper to your control system using the three-wire PWM interface: power supply positive, ground, and PWM signal input. Supply 4.8V to 6V DC power to the servo connector, ensuring adequate current capacity of at least 1 ampere for peak grip force operations. Configure your microcontroller PWM output to generate standard servo control signals between 1000 and 2000 microseconds pulse width, where 1500 microseconds represents the neutral position and values below and above this range control jaw opening and closing respectively.
For closed-loop feedback control, read the analog feedback pin voltage which varies proportionally with jaw position, allowing you to implement position verification routines that confirm successful object grasping before proceeding with manipulation tasks. When operating in high-precision applications, implement software filtering on the feedback signal to eliminate noise from PWM switching, and use PID control loops to achieve smooth acceleration and deceleration profiles that prevent shock loads on the gripper mechanism. Always calibrate the feedback sensor at startup by commanding the gripper to full open and full closed positions to establish accurate position mapping for your specific application.
Frequently Asked Questions
What is the difference between the Pololu 3551 and other micro grippers without position feedback?
The Pololu 3551 integrates a potentiometric position sensor directly into the servo mechanism, enabling closed-loop feedback control without requiring external sensors. This allows your microcontroller to verify grip success, measure object thickness, and implement adaptive grasping strategies. Non-feedback grippers operate open-loop, meaning they cannot confirm whether an object was successfully grasped or measure grip force, making them unsuitable for applications requiring grip verification or variable object handling.
Can the Pololu 3551 be controlled by Arduino or Raspberry Pi?
Yes, the Pololu 3551 is fully compatible with Arduino, Raspberry Pi, and any microcontroller capable of generating PWM signals. Connect the PWM signal pin to any PWM-capable GPIO pin on your microcontroller, supply 4.8-6V power, and use standard servo control libraries. The analog feedback pin can be connected to an ADC input for position monitoring. We recommend using the Servo library for Arduino or RPi.GPIO with PWM for Raspberry Pi implementations.
What is the maximum grip force and how is it measured?
The Pololu 3551 delivers a maximum grip force of 2.5 kilograms when fully closed with full servo torque applied. This force is measured as the compressive force between the gripper jaws when grasping a cylindrical test object. The actual grip force on your specific object depends on object geometry, jaw contact surface friction, and servo supply voltage. Higher supply voltages within the 4.8-6V range produce slightly increased grip force due to increased servo motor torque.
How accurate is the position feedback and can it measure object thickness?
The integrated potentiometric feedback provides 0.1 millimeter positional accuracy across the full 60-degree jaw opening range. By reading the feedback voltage and mapping it to jaw position using calibration values, you can accurately measure object thickness placed between the gripper jaws. This enables applications like automated object sorting by size, quality verification, and adaptive grasping where grip force is adjusted based on detected object dimensions.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy Pololu 3551 Micro Gripper Kit with Position Feedback Servo Online in India
Purchase the Pololu 3551 Micro Gripper Kit with Position Feedback Servo online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Pololu 3551 Micro Gripper Kit with Position Feedback Servo with fast shipping and expert support.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.
Pololu 3551 Micro Gripper Kit with Position Feedback Servo
The Pololu 3551 Micro Gripper Kit is a compact robotic gripper system featuring integrated position feedback servo control, designed for precision manipulation in constrained spaces. Roboticists, automation engineers, and research professionals utilize this kit to develop dexterous robotic arms, pick-and-place systems, and collaborative robot end-effectors with real-time grip force monitoring. This product solves the critical challenge of achieving repeatable, feedback-controlled grasping in applications where space is limited and precise object manipulation is essential.
Product Overview
The Pololu 3551 Micro Gripper Kit integrates a high-torque servo motor with position feedback circuitry, enabling closed-loop gripper control with microsecond-level response times. The servo mechanism uses a precision gear train to convert rotational motion into linear gripper jaw movement, with integrated potentiometric feedback providing real-time position data to the control electronics. The kit includes pre-assembled gripper jaws with textured contact surfaces, a dedicated servo driver module with PWM input compatibility, and comprehensive firmware supporting both open-loop and closed-loop operation modes.
What distinguishes the Pololu 3551 is its exceptionally compact form factor measuring just 45mm x 35mm x 28mm, making it ideal for robotic hands and confined manipulation environments. The position feedback servo operates at 4.8-6V with a maximum grip force of 2.5kg, delivering 60-degree jaw opening range with 0.1mm positional accuracy. The integrated feedback system eliminates the need for external sensors, reducing system complexity and cost while improving reliability in production robotics, surgical instrument prototyping, and educational robotics projects.
Key Specifications
| Specification | Details |
| Product Type | Micro Gripper Kit with Position Feedback Servo |
| Brand | Pololu Robotics and Electronics |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Operating Voltage | 4.8V to 6V DC |
| Maximum Grip Force | 2.5 kilograms |
| Jaw Opening Range | 0 to 60 degrees |
| Positional Accuracy | 0.1 millimeters |
| Servo Speed | 0.15 seconds per 60 degrees |
| Feedback Type | Integrated potentiometric position sensor |
| Dimensions | 45mm x 35mm x 28mm |
| Weight | 65 grams |
| Control Interface | PWM signal input compatible with microcontrollers |
Key Features
- Integrated Position Feedback Servo with closed-loop control enabling real-time grip force monitoring and adaptive grasping strategies for fragile objects
- Compact Micro Form Factor at 45x35x28mm allows integration into robotic hands, surgical instruments, and space-constrained manipulation systems without bulk
- High Grip Force of 2.5kg combined with 60-degree jaw opening provides versatile object manipulation from delicate electronics to industrial components
- Precision Potentiometric Feedback delivers 0.1mm positional accuracy with microsecond response times, critical for repeatable pick-and-place operations
- PWM Control Interface ensures seamless integration with Arduino, Raspberry Pi, and industrial PLC systems using standard servo control protocols
- Pre-assembled Gripper Jaws with textured contact surfaces minimize object slippage while protecting delicate surfaces during manipulation
Applications and Use Cases
- Collaborative Robot End-Effectors where position feedback enables force-limiting grasping modes to ensure human-safe interaction in shared workspaces
- Surgical and Medical Robotics requiring millimeter-level precision and feedback control for minimally invasive instrument manipulation and tissue handling
- Educational Robotics Projects and university research programs developing multi-fingered robotic hands with feedback-controlled dexterous manipulation capabilities
- Automated Assembly and Pick-and-Place Systems for electronics manufacturing where precise object positioning and grip verification prevent product damage and assembly errors
- Drone Payload Manipulation where the lightweight 65-gram gripper enables aerial robots to grasp, transport, and release objects with real-time position confirmation
- Prosthetic Hand Development utilizing the integrated feedback mechanism to provide sensory feedback to amputees through neural interfaces
How to Use
Begin by connecting the Pololu 3551 Micro Gripper to your control system using the three-wire PWM interface: power supply positive, ground, and PWM signal input. Supply 4.8V to 6V DC power to the servo connector, ensuring adequate current capacity of at least 1 ampere for peak grip force operations. Configure your microcontroller PWM output to generate standard servo control signals between 1000 and 2000 microseconds pulse width, where 1500 microseconds represents the neutral position and values below and above this range control jaw opening and closing respectively.
For closed-loop feedback control, read the analog feedback pin voltage which varies proportionally with jaw position, allowing you to implement position verification routines that confirm successful object grasping before proceeding with manipulation tasks. When operating in high-precision applications, implement software filtering on the feedback signal to eliminate noise from PWM switching, and use PID control loops to achieve smooth acceleration and deceleration profiles that prevent shock loads on the gripper mechanism. Always calibrate the feedback sensor at startup by commanding the gripper to full open and full closed positions to establish accurate position mapping for your specific application.
Frequently Asked Questions
What is the difference between the Pololu 3551 and other micro grippers without position feedback?
The Pololu 3551 integrates a potentiometric position sensor directly into the servo mechanism, enabling closed-loop feedback control without requiring external sensors. This allows your microcontroller to verify grip success, measure object thickness, and implement adaptive grasping strategies. Non-feedback grippers operate open-loop, meaning they cannot confirm whether an object was successfully grasped or measure grip force, making them unsuitable for applications requiring grip verification or variable object handling.
Can the Pololu 3551 be controlled by Arduino or Raspberry Pi?
Yes, the Pololu 3551 is fully compatible with Arduino, Raspberry Pi, and any microcontroller capable of generating PWM signals. Connect the PWM signal pin to any PWM-capable GPIO pin on your microcontroller, supply 4.8-6V power, and use standard servo control libraries. The analog feedback pin can be connected to an ADC input for position monitoring. We recommend using the Servo library for Arduino or RPi.GPIO with PWM for Raspberry Pi implementations.
What is the maximum grip force and how is it measured?
The Pololu 3551 delivers a maximum grip force of 2.5 kilograms when fully closed with full servo torque applied. This force is measured as the compressive force between the gripper jaws when grasping a cylindrical test object. The actual grip force on your specific object depends on object geometry, jaw contact surface friction, and servo supply voltage. Higher supply voltages within the 4.8-6V range produce slightly increased grip force due to increased servo motor torque.
How accurate is the position feedback and can it measure object thickness?
The integrated potentiometric feedback provides 0.1 millimeter positional accuracy across the full 60-degree jaw opening range. By reading the feedback voltage and mapping it to jaw position using calibration values, you can accurately measure object thickness placed between the gripper jaws. This enables applications like automated object sorting by size, quality verification, and adaptive grasping where grip force is adjusted based on detected object dimensions.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy Pololu 3551 Micro Gripper Kit with Position Feedback Servo Online in India
Purchase the Pololu 3551 Micro Gripper Kit with Position Feedback Servo online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Pololu 3551 Micro Gripper Kit with Position Feedback Servo with fast shipping and expert support.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.