FEETECH Standard Servo FS5103B-FB with Position Feedback
This version of the FS5103B standard servo from FEETECH is specially modified to provide access to the feedback potentiometer through a fourth (green) wire, allowing you to directly measure the position of the output. This extra information enables more complex robotics applications, such as determining when the servo has reached its target, detecting when the output is blocked, or implementing your own higher-level closed-loop position control.
Key specs at 6 V: 0.16 sec/60°, 53 oz-in (3.8 kg-cm), 43 g.
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The FS5103B-FB is a specially modified version of FEETECH’s FS5103B standard-size analog servo that provides access to the feedback potentiometer through a fourth (green) wire, which makes it possible to directly measure the output angle. With this extra information, you can determine when the servo has reached its target position (or detect if something is interfering with its ability to get there). This feedback also enables more complex closed-loop control of the servo from your main controller.
Like the FS5103B, the FS5103B-FB works with standard RC servo pulses, providing a running angle of approximately 180° over a servo pulse range of 600 µs to 2400 µs. The feedback voltage varies linearly over this range, and there is approximately a 1:1 correspondence between the feedback in millivolts and the servo position in milliseconds. For example, the feedback voltage will be around 1.5 V when the servo output is at the position corresponding to 1.5 ms.
The servo signal, power, and ground are provided through a 3-wire servo cable that is terminated with a standard JR-style connector, which is Futaba-compatible. The feedback is accessible through a separate green wire that is terminated like our female premium jumper wires and works with standard 0.1″ male header pins. These cables are approximately 12″ (30 cm) long.
Servo and feedback connectors on the FEETECH servos with position feedback.
For more information about this servo, see the FS5013B datasheet (133k pdf) (please note that this is the datasheet for the standard FS5103B, so it does not include any information about the special feedback modification).
FEETECH Standard Servo FS5103B with included hardware (actual hardware might vary).
An aluminum servo horn that works with this servo is available separately:
Power HD SR8 Aluminum 25T Servo Horn.
This servo is also compatible with our Mounting Bracket for Standard-Size Servos:
Note that, as with most hobby servos, stalling or back-driving this servo can damage it.
Comparison to the Power HD 3001HB servo
This servo is a lower-cost alternative to the 3001HB from Power HD, which has nearly identical dimensions and similar performance. The two servos should be generally interchangeable for most applications. The picture below shows both the FS5103B and the 3001HB side by side: