Feetech FS90R servomotor

Description

Visit FEETECH FS90R is a continuously variable micro servo specifically designed for small robotic projects. Lightweight, efficient and easy to use, it's particularly suited to makers, educators and beginners who want to give movement to their fixtures.

Lightweight, compact design

Weighing just 9 grams and with small dimensions (approx. 32 × 12.5 × 22-23 mm), the FS90R integrates easily into miniature robots, articulated arms or small mobile platforms. Its compact size allows unobtrusive installation without compromising performance.

Continuous rotation operation

Unlike conventional servos, which position an axis at a given angle, the FS90R rotates the axis. continuous 360° rotationas a pulse-controlled variable-speed motor. The standard servo signal (1.5 ms) stops the motor; a longer signal rotates in one direction, a shorter signal reverses rotation. This makes it possible to modulate speed and direction via Arduino, Raspberry Pi or any suitable microcontroller.
A small potentiometer on the underside of the servo allows precise calibration of the stop point, for fine, drift-free response.

Useful driving performance

At 6 V, the servo reaches a maximum speed of approx. 130 RPM (free rotation), with a maximum torque of approx. 1.5 kg-cm (≈ 21 oz-in). At 4.8 V, the speed is approx. 110 RPM and the torque drops to about 1.3 kg-cm (≈ 18 oz-in).
In idle mode, it consumes between 100 mA (4.8 V) and 120 mA (6 V)while the stall current is of the order of 550 mA at 4.8 V or up to 650 mA at 6 V. These values indicate that it is powerful for its size, but requires a power supply capable of delivering a peak current.

Included accessories and standard compatibility

The servo is supplied with several servo horns (straight, star, etc.) and the screws required for mounting. It uses a standard JR connector, perfectly compatible with current servo controllers.
Its operation with conventional servo signals (PWM pulses) makes it compatible with virtually all existing programming libraries (Arduino, MakeCode, etc.).

Educational and creative applications

ideal for animating mobile robots (cars, rolling chassis), moving turrets, rotating projectors or simple mechanisms. It also lends itself well to projects teaching physical programming, where angular precision is of little importance.

Easy installation and precise calibration

The user inserts the control board (Arduino, Micro:bit board or other), connects the control pin, power supply and GND, and can then immediately drive the servo. Thanks to the "neutral" potentiometer, simply adjust the rest signal (1.5 ms) so that the servo remains stationary as long as the signal is neutral - useful for avoiding drift between commands.

What Makes It Stand Out

• Excellent report size / power / price
• Controllable continuous rotationperfect for robotic bases
• Fine calibration stop point for smooth control
• Compatible with popular platforms (Arduino, Micro:bit, Raspberry Pi, etc.)

Conclusion

Visit FEETECH FS90R servo is the right choice for anyone who wants to add movement to their electronic projects without making life too complicated. Compact, modular, powerful and compatible, it offers a simple solution for animating robots, miniature vehicles and moving mechanisms, while remaining accessible to beginners and experienced makers alike.