FEETECH FS90-FB Micro Servo with Position Feedback

Feetech formerly known as Fitec is known for producing a high-quality range of Micro Servos that are considered some of the best in the market. The FS90F is a custom version of the FS90 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. This feedback also enables more complex closed-loop control of the servo from your main controller.

Quick Spec

• Max Torque: 1.5kg.cm
• Max Rotation: 180 degrees
• Feedback Type: Analog
• No-load current @ 6V: 200 mA
• Stall current @ 6V: 600 mA
• Speed @ 6V: 0.10 sec/60°
• Stall torque @ 6V: 1.5 kg·cm
• Speed @ 4.8V: 0.12 sec/60°
• Stall torque @ 4.8V: 1.3 kg·cm

Code

In this example, we're using an analog pin to read the feedback signal from the servo, which is connected to pin 0. The target angle for the servo is set to 90 degrees, but you can change this value to whatever angle you want the servo to move to. The feedback signal is mapped to an angle value using the map function, and the error between the target and current angle is calculated. We then map this error value to a servo offset value using another map function. Finally, we calculate the new servo position by adding the offset to the target angle, and set the servo to that position using the write function. The serial monitor is also used to display the target angle, current angle, error, and servo position for debugging purposes. Note that this is just a basic example and you may need to adjust the code to suit your specific application and hardware setup.

Positional vs Continuous Rotation Servo Motors

Resources

• Product Page
• Datasheet

Shipping List

• 1 X FEETECH FS90-FB Micro Servo with Position Feedback
• 1 X Servo Horns Set