Pololu FEETECH High-Torque Servo FS5115M-FB with Position Feedback

The FS5115M-FB is a high-torque, standard-size analog servo from FEETECH, featuring a unique position feedback capability through an additional green wire. This allows users to directly measure the output angle, making it possible to determine when the servo reaches its target or if there is any interference. Equipped with a powerful motor and an all-metal gear train, it delivers more than twice the torque of standard servos with plastic gears. The output shaft is supported by dual ball bearings, reducing friction for smoother operation. It operates with standard RC servo pulses, providing a running angle of approximately 180° over a pulse range of 500 µs to 2500 µs.

The FS5115M-FB is perfect for applications requiring precise position control and feedback. Robotics enthusiasts can use it for creating robotic arms, where knowing the exact position is crucial for task accuracy. The feedback feature also enables advanced closed-loop control, enhancing the servo’s performance in automated systems.

One of the standout benefits of this servo is its robust construction, thanks to the all-metal gear train. This design not only ensures durability but also allows it to handle more demanding tasks without the risk of gear stripping. The dual ball bearings further enhance its longevity and reliability, making it a valuable component in both hobbyist and professional projects.

The servo is equipped with a 3-wire cable for signal, power, and ground, ending with a standard JR-style connector compatible with Futaba systems. The feedback wire is terminated similarly to premium jumper wires, making it easy to integrate into various setups. The cables extend approximately 30 cm, providing ample length for diverse applications.

For those seeking a cost-effective yet powerful servo solution, the FS5115M-FB serves as an excellent alternative to the Power HD 1501MG servo. It shares nearly identical dimensions and similar performance, ensuring compatibility and interchangeability in most applications.

However, users should be cautious not to stall or back-drive the servo, as this could cause damage. The servo can draw bursts of current exceeding 3 A at 6 V, so an appropriate power supply is necessary to prevent strain on the system.