The FS0403-FB is a specially modified version of FEETECH’s FS0403 sub-micro 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 FS0403, the FS0403-FB works with standard RC servo pulses, providing an operating angle of approximately 120° over a servo pulse range of 900 µs to 2100 µs. The feedback voltage varies linearly over this range by a couple of volts. 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. (In our tests, we were able to get an expanded range of approximately 180° over a pulse range of 650 µs to 2500 µs.

Specifications:

• Digital?: N
• Speed @ 6V: 0.08 sec/60°
• Stall torque @ 6V: 0.7 kg·cm
• Speed @ 4.8V: 0.09 sec/60°
• Stall torque @ 4.8V: 0.6 kg·cm
• Hardware included?: Y
• Lead length: 6 in

Documents:

• Datasheet

Warranty:

• Warranty will not apply if Product fails or is damaged after delivery to you due to accident, abuse or misuse.

Package Includes:

• 1 x Pololu 3438 FEETECH Sub-Micro Servo FS0403-FB with Position Feedback