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Pololu item #:
2818
Brand:
FEETECH
The FS90 analog servo from FEETECH is a great general-purpose micro servo at a great price. Servo horns and associated hardware are included. This servo can work with both 5 V and 3.3 V servo signals.
Key specs at 6 V: 0.10 sec/60°, 21 oz-in (1.5 kg-cm), 9.0 g.
Compare all products in RC Servos or FEETECH Servos.
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FEETECH FS90 Micro Servo. |
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FEETECH FS90 Micro Servo with a LEGO Minifigure as a size reference. |
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An example of hardware included with the FEETECH FS90 and FS90R micro servos. Actual hardware might vary. |
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The servo cable is terminated with a Futaba-compatible JR-style connector. |
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FEETECH FS90 Micro Servo with a LEGO Minifigure as a size reference. |
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This is a great general-purpose actuator for tiny mechanisms. The FS90 is a 9 g analog servo from FEETECH (formerly known as Fitec) that offers position control over an approximate 120° operating angle for servo pulses between 900 µs and 2100 µs. As with most servos, the pulse range can be expanded to achieve an expanded operating angle, but the limits of this are not specified by FEETECH. The servo has a 8″ (200 mm) lead that is terminated with a standard JR-style connector, which is Futaba-compatible, and additional servo horns and mounting hardware are included.
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You can find more information about this servo in its datasheet (69k pdf).
For more advanced robotics applications, please note that we also carry a version of this servo that is specially modified to provide access to the feedback potentiometer through a fourth (green) wire, which lets you monitor the actual position of the servo from your controller:
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FEETECH FS90-FB Micro Servo with Position Feedback. |
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Note that as with most hobby servos, stalling or back-driving this servo can damage it.
Two versions of this servo are available. This product is the FS90, which offers closed-loop position control over a limited range. Alternatively, the FS90R is specifically designed to be a continuous-rotation micro servo that offers open-loop speed control. The FS90 and FS90R have identical dimensions and use the same motor, so the FS90 will also work with our 60×8mm wheel for the FEETECH FS90R.
| Size: | 23.2 × 12.5 × 22 mm |
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| Weight: | 9 g |
| Digital?: | N |
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| No-load current @ 6V: | 200 mA |
| Stall current @ 6V: | 600 mA1 |
| Speed @ 6V: | 0.10 sec/60° |
| Stall torque @ 6V: | 1.5 kg·cm |
| Speed @ 4.8V: | 0.12 sec/60° |
| Stall torque @ 4.8V: | 1.3 kg·cm |
| Hardware included?: | Y |
| Lead length: | 8 in |
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Most standard radio control (RC) servos have three wires, each a different color. 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).
Note: Some of the servos we carry also have an optional fourth green wire that is separate from the three standard ones. This wire provides access to the feedback potentiometer, allowing you to directly measure the position of the output. The servos with this extra wire have "with Position Feedback" at the ends of their product names. The picture below is an example of such a servo.
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FEETECH Sub-Micro Servo FS0403-FB with Position Feedback. |
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We do not specify the range of rotation of our servos because this information is not generally available from servo manufacturers. RC servos are usually intended for controlling things like the steering mechanism in an RC car or the flaps on an RC plane. Manufacturers make sure that the range is enough for these typical applications, but they do not guarantee performance over a wider range.
This means most RC servos will rotate about 90° using the standard 1–2 ms pulse range used by most RC receivers. However, if you are using a controller capable of sending a wider range of pulses, many servos can rotate through almost 180°.
You can find a servo’s limits if you use a servo controller that can send pulses outside of the standard range (such as our Maestro servo controllers). To find the limits, use the lowest possible supply voltage at which the servo moves, and gradually increase or decrease the pulse width until the servo does not move any further or you hear the servo straining. Once the limit is reached, immediately move away from it to avoid damaging the servo, and configure your controller to never go past the limit.
You might be wondering why we do not just follow the above steps for all the servos we carry and list a specification for degrees of rotation. Unfortunately, since servo manufacturers do not specify the range of rotation, it might change from one manufacturing run to the next. They will not inform us about changes that are not specified, and we have no way of knowing if or when they might change their manufacturing process.
For more information about servos and how to control them, we recommend the series of blog posts on servos starting with: Introduction to servos.
We are excited to announce the newest additions to our selection of servos: FEETECH FS90-FB Micro Servo with Position Feedback...
We are now carrying the FEETECH FS90 micro servo. At a weight of only 9 g and less than inch long, this servo is great for actuating tiny...