Analogue Feedback Servo

This Feedback Servo adds position sensing to a standard hobby servo by exposing the potentiometer output, making it ideal for robotics, motion recording, and projects that need real-time feedback on servo position.

It looks like a servo; it acts like a servo, but it's more than just a servo! We got a factory to custom-make these classic 'standard' sized hobby servos with a twist - the feedback (potentiometer wiper) line is brought out to a fourth white wire. You can read this wire with an analogue input such as those on an Arduino, to get the servo's position. That information can be used in robotics to improve stability or even allow 'recording' of servo motion.

Please note that the default servo pulse widths (usually 1ms to 2ms) may not give you a full 180 degrees of motion. In that case, check if you can set your servo controller to custom pulse lengths and try 0.75ms to 2.25ms. You can try shorter/longer pulses, but be aware that if you go too far you could break your servo!

Check out our example Arduino sketch, which demonstrates how to record motion data to the EEPROM and then play it back when a button is pressed. It comes with a range of horns.

Features

• Standard sized hobby servo with position feedback
• Fourth white wire outputs potentiometer feedback for analogue position reading
• Compatible with Arduino and other microcontrollers with analogue inputs
• Enables servo position monitoring for robotics applications
• Supports motion recording and playback functionality
• Customisable pulse widths (0.75ms to 2.25ms recommended for full 180° range)
• Includes example Arduino sketch for EEPROM recording
• Supplied with multiple servo horns
• Improves system stability through position feedback

Specifications

• High Strength nylon fibre shell
• High Strength nylon gear
• Integrated digital control circuit
• Dual-ball bearing
• Dimensions: 39.3mm x 19.4mm x 38.7mm
• Weight: 48.8g
• Parameters
  • 4.8V-3.8kg/cm - 0.22sec/60degree
  • 6V-5.0kg/cm - 0.18sec/60degree

Revision History

• As of January 29, 2024 - The servo is now a 'digital servo': the internal control circuitry is digital not analogue. The feedback signal is still an analogue voltage, and works the same as the previous version.

Resources

• Datasheet

Package Contents

• 1x  Analogue Feedback Servo