Pololu FEETECH Mini Servo FT1117M-FB with Position Feedback

The FT1117M-FB is a compact, high-performance servo from FEETECH that stands out with its unique position feedback feature. This modification allows access to the feedback potentiometer via an additional green wire, enabling precise output angle measurement. With metal gears (except for the plastic pinion gear), it delivers impressive speed and torque, comparable to larger servos, while maintaining compatibility with standard-size servo horns.

This servo is ideal for applications requiring precise control, such as robotics, model aircraft, or animatronics. The ability to measure the output angle directly enhances the servo's functionality, allowing users to implement advanced closed-loop control systems. This feature ensures that the servo reaches its intended position accurately and detects any obstruction that might prevent it from doing so.

Operating with standard RC servo pulses, the FT1117M-FB covers an approximate 120° angle range, adjustable with a pulse range of 900 µs to 2100 µs. Users have successfully expanded this range to about 165° with a pulse range of 550 µs to 2400 µs, although this is beyond the official specifications. The servo's feedback voltage changes linearly over the operating range, providing reliable positional data.

The servo is equipped with a 3-wire cable for signal, power, and ground, ending in a JR-style connector that is Futaba-compatible. The feedback wire, terminated like premium jumper wires, interfaces with standard 2.54 mm male header pins. These cables are approximately 18 cm long, ensuring flexibility in various setups.

When comparing with the Power HD 1711MG, the FT1117M serves as a cost-effective alternative with nearly identical dimensions and performance. These servos are generally interchangeable, making the FT1117M-FB a versatile choice for a wide range of applications.

As with most hobby servos, caution is advised to avoid stalling or back-driving, which can lead to damage. The FT1117M-FB offers an exceptional balance of precision, performance, and affordability, making it a valuable addition to any project requiring reliable servo control.