FEETECH FS90R Micro Continuous Rotation Servo

Pololu item #: 2820 1039 in stock
Brand: FEETECH
RoHS 3 compliant

Price break Unit price (US$)
1 4.95
10 4.46
100 3.96


backorders allowed

The FS90R is a micro servo that has been built by FEETECH specifically for continuous rotation, offering an inexpensive and easy way to get your small turret spinning or miniature robot moving, especially when paired with our 60×8mm wheels designed specifically for this servo. This servo can work with both 5 V and 3.3 V servo signals.

Key specs at 6 V: 130 RPM (no-load), 21 oz-in (1.5 kg-cm), 9 g

 Description Specs (11) Pictures (8) Resources (0) FAQs (1) On the blog (4) 

Bottom view of FEETECH FS90R micro continuous rotation servo (V2.0) showing middle-point adjustment potentiometer.

Overview

The FS90R is a micro-sized servo that has been built by FEETECH (formerly known as Fitec) specifically for continuous rotation. At 6 V, it has a maximum rotation speed of around 130 RPM (no-load) and can produce up to 21 oz-in (1.5 kg-cm) of torque. The servo can be controlled using a direct connection to a single microcontroller I/O line without any additional electronics, which makes it a great miniature actuator for beginner robotics projects; just throw on a pair of wheels and your robot is ready to roll!

The FS90R continuous rotation servo converts standard RC servo position pulses into continuous rotation speed. The default rest point is 1.5 ms, but this can be adjusted by using a small screwdriver to turn the middle-point adjustment potentiometer. Pulse widths above the rest point result in counterclockwise rotation, with speed increasing as the pulse width increases; pulse widths below the rest point result in clockwise rotation, with speed increasing as the pulse width decreases.

The servo has a 10″ (250 mm) lead that is terminated with a JR-style connector and includes additional servo horns and mounting hardware. The following picture shows an example of the hardware that might be included (actual hardware could vary):

This robotics servo, which is a continuous rotation version of the FEETECH FS90, is compatible with our servo controllers. If you are looking for a similar servo that is capable of limited-range position control as opposed to continuous rotation speed control, consider the FS90, which has identical dimensions and uses the same motor, or the Power HD micro servo HD-1900A, which has almost the same weight, speed, and torque as the FS90.

Note that, as with most hobby servos, stalling or back-driving this servo can damage it.

Wheels

If you want to use this servo as an actuator for your miniature robot, you will need a wheel to go with it. Fortunately, we carry compatible servo wheels for micro servos (20T, 4.8 mm spline):

60 mm and 40 mm Pololu Wheels for Micro Servo Splines on FEETECH’s FT90R and FS90R micro continuous rotation servos.

The 60×8mm wheel allows for a top speed of around 42 cm/s (1.3 ft/s) at 6 V.

Continuous rotation servo comparison

Continuous rotation servo size comparison. From left to right: SpringRC SM-S4303R, Power HD AR-3606HB, FEETECH FS5106R, Parallax Feedback 360°, Parallax (Futaba S148), and FEETECH FS90R.

6 V 4.8 V Weight (g) Size (mm) Digital? Feed­back? Price
Max speed
(RPM)
Stall torque
(oz·in)
Max speed
(RPM)
Stall torque
(oz·in)
SpringRC SM-S4303R 54 71 43 46 41  41.3 × 20.7 × 40.2  $12.95
PowerHD AR-3606HB 71 93 62 83 40  40.5 × 20.0 × 38.0  $14.95
FEETECH FS5106R 95 83 78 70 39  40.8 × 20.1 × 38.0  $13.95
Parallax Feedback 360° 140 35 41  40.0 × 20.0 × 37.2  yes yes $27.99
FEETECH FT90R 135 21 108 18 9  22.9 × 12.1 × 26.5  yes $7.95
FEETECH FS90R 130 21 100 18 9  23.2 × 12.5 × 22.0  $4.95

People often buy this product together with:

Pololu Wheel 60×8mm Pair for FEETECH FS90R/FT90R Micro Servo - Black Pololu Wheel 60×8mm Pair for FEETECH FS90R/FT90R Micro Servo - Black
Micro Maestro 6-Channel USB Servo Controller (Assembled) Micro Maestro 6-Channel USB Servo Controller (Assembled)
Power HD Continuous Rotation Servo AR-3606HB Power HD Continuous Rotation Servo AR-3606HB

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Related Categories

Continuous Rotation Servos
FEETECH Servos
Pololu Wheels for Servos
RC Servo Controllers
Servo Cables
Motors and Gearboxes
6.0 V NiMH Battery Packs
Voltage Regulators
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