FEETECH FS90 Micro Servo

The FS90 analogue servo from FEETECH is a great general-purpose micro servo at a great price. Servo horns and associated hardware are included. Key specs at 6 V: 0.10 sec/60°, 21 oz-in (1.5 kg-cm), 9.0 g.

AUD$ 9.95

In stock in Australia  

Shipping from $7.90

+710 more from our supplier in 7-10 days

Our Code: SKU-003780

Supplier Link: [Pololu MPN:2818]


Description

FEETECH FS90 Micro Servo with a LEGO Minifigure as a size reference.

Overview

This is a great general-purpose actuator for tiny mechanisms. The FS90 is a 9 g analogue servo from FEETECH (formerly known as Fitec) that offers position control over a 120° operating angle for standard 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 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):

Note that as with most hobby servos, stalling or back-driving this servo can strip its gears.

FS90 vs FS90R

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.


Specifications

Dimensions

Size: 23.2 × 12.5 × 22 mm
Weight: 9 g

General specifications

Digital?: N
Free-run 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
Lead length: 8 in
Hardware included?: Y

Notes:

1
This value came from our tests. It is not specified by the manufacturer and therefore could change without notice. Stalling should generally be avoided as it can damage the motor and gears.

FAQs

What are the three wires coming out of my servo?

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:

  • brown or black = ground (GND, battery negative terminal)
  • red = servo power (Vservo, battery positive terminal)
  • orange, yellow, white, or blue = servo control signal line

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).

How many degrees can this servo turn? Why do you not list it with the other specifications?

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.

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