Pololu 2817 FEETECH FT90R Digital Micro Continuous Rotation Servo
Pololu 2817 FEETECH FT90R Digital Micro Continuous Rotation Servo
Pololu 2817 FEETECH FT90R Digital Micro Continuous Rotation Servo
The Pololu 2817 FEETECH FT90R is a digital micro continuous rotation servo designed for robotics projects requiring precise speed control and compact form factor. Roboticists, drone developers, and embedded systems engineers rely on this servo for applications demanding reliable 360-degree rotation with digital feedback and programmable speed control. This servo solves the challenge of integrating continuous motion control in size-constrained platforms while maintaining accuracy and torque delivery.
Product Overview
The FEETECH FT90R is a digital servo that operates on a continuous rotation principle, eliminating the traditional 180-degree limitation of standard servos. Unlike analog servos, this digital model features a microcontroller-based control system that interprets PWM signals to determine both direction and speed of rotation. The servo accepts standard RC PWM signals between 1000-2000 microseconds, with 1500 microseconds representing neutral stop position. Speeds below 1500 microseconds rotate counterclockwise while speeds above rotate clockwise, with rotation speed proportional to the signal deviation from center.
The FT90R distinguishes itself through its compact micro form factor, making it ideal for weight-sensitive applications like quadcopters, robotic arms, and autonomous vehicles. The digital architecture provides superior speed regulation compared to analog alternatives, reducing speed variation across load changes. Built-in feedback mechanisms allow for position monitoring and speed verification, critical for applications requiring synchronized multi-servo coordination. The servo features metal gears and a reinforced plastic housing, balancing durability with minimal weight addition to your platform.
Key Specifications
| Specification | Details |
| Product Type | Digital Continuous Rotation Micro Servo |
| Brand | FEETECH by Pololu |
| Origin | Original and 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 |
| Stall Torque | 1.3 kg-cm at 5V |
| Speed | 60 degrees per second at 5V |
| Control Signal | 1000-2000 microsecond PWM pulses |
| Dimensions | 23 x 12 x 29 mm |
| Weight | 9 grams |
Key Features
- Digital servo control with precise PWM signal interpretation enabling smooth acceleration and deceleration profiles for robotic motion
- Continuous 360-degree rotation capability with programmable speed control from stop to maximum velocity
- Compact micro form factor weighing only 9 grams, ideal for weight-constrained UAV and miniature robot applications
- Metal gear construction providing enhanced durability and consistent torque delivery under sustained load conditions
- Wide operating voltage range of 4.8V to 6V DC with built-in voltage regulation for stable performance
- Standard RC servo connector compatible with most microcontroller platforms including Arduino, Raspberry Pi, and PLC systems
Applications and Use Cases
- Quadcopter and drone propeller speed control where synchronized multi-servo rotation requires digital precision and minimal latency
- Robotic arm joint actuation for collaborative robots needing continuous rotation with variable speed control and load feedback
- Autonomous vehicle wheel drive systems where differential speed control enables precise steering and motion coordination
- Camera gimbal stabilization systems requiring smooth continuous panning and tilting with programmable speed profiles
- Conveyor belt and material handling automation where speed regulation and direction control are critical for production efficiency
- Educational robotics platforms and STEM projects requiring affordable yet reliable continuous motion control
How to Use
Connect the FEETECH FT90R servo to your microcontroller using three wires: red for positive voltage (4.8V-6V), black for ground, and yellow for PWM signal input. Configure your microcontroller to generate PWM signals with 50Hz frequency and pulse width between 1000-2000 microseconds. The neutral position (no rotation) is achieved at 1500 microseconds. To rotate counterclockwise, reduce the pulse width below 1500 microseconds; to rotate clockwise, increase it above 1500 microseconds. The rotation speed is proportional to the deviation from center, with maximum speed achieved at pulse extremes of 1000 or 2000 microseconds.
For optimal performance, ensure your power supply can deliver sufficient current, as stalled servos draw up to 750mA. Use a separate power supply for servos rather than drawing from your microcontroller's power pins. Implement software debouncing and signal filtering to prevent jitter from affecting rotation smoothness. When using multiple servos, stagger their command updates to avoid simultaneous current spikes that could cause voltage sag. Test your PWM timing with an oscilloscope or logic analyzer to verify signal accuracy before deploying in production environments.
Frequently Asked Questions
What is the difference between this continuous rotation servo and a standard servo?
Standard servos rotate only 180 degrees and return to a specific angle based on PWM input. The FT90R continuous rotation servo rotates 360 degrees indefinitely in either direction. PWM values below 1500 microseconds control counterclockwise speed, while values above 1500 control clockwise speed. Standard servos use PWM to set position; the FT90R uses PWM to set speed and direction, making it ideal for wheels, propellers, and continuous motion applications.
Can I use this servo with Arduino or Raspberry Pi?
Yes, the FT90R is fully compatible with Arduino and Raspberry Pi. Arduino boards can generate PWM signals using the Servo library or analogWrite function on PWM-capable pins. Raspberry Pi requires GPIO PWM configuration using libraries like RPi.GPIO or pigpio. Connect the yellow signal wire to a PWM-capable pin, red to 5V or external power supply, and black to ground. Ensure your power supply can handle servo current draw independently from your microcontroller.
What happens if I apply voltage outside the 4.8V to 6V range?
Operating below 4.8V reduces torque output and may cause erratic behavior or servo shutdown. Voltages above 6V risk damaging internal electronics and voiding warranty. For 3.7V lithium battery applications, use a boost converter to step up voltage to 5V. Always use a regulated power supply with adequate current capacity (minimum 1A for single servo, more for multiple servos) to maintain stable voltage under load.
How do I control speed smoothly without jerky movements?
Implement software acceleration ramping by gradually incrementing or decrementing PWM values over multiple milliseconds rather than jumping directly to target speed. Use a timer interrupt or delay loop to update PWM values every 10-50 milliseconds depending on desired smoothness. This technique prevents mechanical shock to gears and reduces current spikes. For multi-servo synchronization, apply identical acceleration profiles to all servos to maintain coordinated motion.
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.
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- Returns: 7-day return policy on manufacturing defects only
Buy Pololu 2817 FEETECH FT90R Digital Micro Continuous Rotation Servo Online in India
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