Feetech FS90R 4.8V 1.3kg.cm 360° Continuous Rotation Micro Servo

The Feetech FS90R is a 9 g micro servo built for continuous rotation rather than fixed-angle positioning: the control pulse sets direction and speed, so it behaves like a small geared motor with its driver built in. It suits small wheeled robots, rotating sensor or camera mounts, light winches and drone release mechanisms where a standard-size servo is too heavy.

Key features

• No end stop: pulses above the rest point turn the output anticlockwise, pulses below turn it clockwise, and speed rises the further the pulse moves from rest
• 1.5 kg.cm stall torque at 6V
• Runs from 4.8-6V, so a 5V BEC or receiver rail powers it directly
• Plastic POM gear train in a nylon and fibreglass case
• Standard 3-wire PWM input, driven by an RC receiver, a flight controller servo output or a microcontroller pin

Specifications

• Operating voltage: 4.8-6V
• Stall torque: 1.3 kg.cm at 4.8V, 1.5 kg.cm at 6V
• Rated torque: 0.5 kg.cm at 6V
• Control pulse: 900-2100 µs
• Rotation: 360° continuous
• Gears: plastic (POM), no ball bearing
• Lead length: 250 mm
• Weight: 9 g
• Operating temperature: -15 to 70°C

If the output creeps at your neutral pulse, trim the neutral value in code or in the flight controller's servo settings until it holds still.