The FT90R is a digital micro servo that has been built by FEETECH (formerly known as Fitec) 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 ...
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Supplier Link: [Pololu MPN:2817]
FEETECH FS90R micro continuous rotation servo with a LEGO Minifigure as a size reference.
The FT90R is a micro-sized digital 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 170 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 FT90R continuous rotation servo converts standard RC servo position pulses into continuous rotation speed. The rest point is set precisely to 1.5 ms with a deadband width of ±20 µs. Pulse widths above the rest point result in anti-clockwise 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):
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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.
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 a 60×8 mm wheel specifically designed for use with this servo:
Pololu Wheel for FEETECH FS90R/FT90R Micro Servo, 60×8mm, mounted on an FS90R micro servo. |
Pololu Wheel for FEETECH FS90R/FT90R Micro Servo, 60×8mm, mounted on an FS90R micro servo. (1) |
Pololu Wheel for FEETECH FS90R/FT90R Micro Servo, 60×8mm, mounted on an FS90R micro servo. (2) (2) |
The wheel size is well matched to the servo’s speed and torque, allowing for a top speed of around 40 cm/s (1.3 ft/s) at 6 V.
Continuous rotation servo size comparison. From left to right: SpringRC SM-S4303R, Power HD AR-3606HB, Parallax, and FEETECH FS90R.
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| SpringRC SM-S4303R | PowerHD AR-3606HB | Parallax (Futaba S148) | FEETECH FS90R | |
| Max Speed @ 6 V: | 54 RPM | 71 RPM | 50 RPM | 130 RPM |
| Stall torque @ 6 V: | 71 oz-in | 93 oz-in | 42 oz-in | 21 oz-in |
| Max Speed @ 4.8 V: | 43 RPM | 62 RPM | 39 RPM | 100 RPM |
| Stall torque@ 4.8 V: | 46 oz-in | 83 oz-in | 33 oz-in | 18 oz-in |
| Weight: | 41 g | 40 g | 43 g | 9 g |
| Size (mm): | 41.3×20.7×40.2 | 40.5×20.0×38.0 | 40.5×20.0×38.0 | 23.2×12.5×22 |
| Price: | $12.95 | $14.95 | $13.95 | $4.95 |
| Size: | 23.2 × 12.5 × 22 mm |
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| Weight: | 9 g |
| Digital?: | Y |
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| Free-run current @ 6V: | 120 mA |
| Stall current @ 6V: | 800 mA1 |
| Speed @ 6V: | 170 rpm |
| Stall torque @ 6V: | 21 oz·in1 |
| Speed @ 4.8V: | 135 rpm |
| Stall torque @ 4.8V: | 18 oz·in1 |
| Lead length: | 10 in |
| Hardware included?: | Y |
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Most standard radio control servos (and all RC servos we sell) have three wires, each a different colour. Usually, they are either black, red, and white, or they are brown, red, and orange/yellow:
Please check the specs for your servo to determine the proper power supply voltage, and please take care to plug the servo into your device in the proper orientation (plugging it in backwards could break the servo or your device).
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