FS90R Continuous Rotation Servo from FEETECH (Fitec)

The FS90R servo is a special servo made for continuous rotation. Instead of just being able to rotate back and forth as traditional servos, the FS90R can make full revolutions, which makes it great for projects such as driving wheels on a small robot.
The FS90R is a special servo made for continuous rotation. It can make full revolutions forward or backward, which makes it great for projects such as driving wheels on a small robot. We also sell the 60mm wheels with tires made specifically for this servo. With traditional servos you can control which position (angle of revolution) the servo's arm moves to. With the same control signals used to control traditional servos you can control the FS90R servo's shaft to be stationary or rotating either clockwise (CW) or counterclockwise (CCW) and the speed of rotation. The signal you would use to tell a traditional servo to go to its middle position, 1.5ms pulse signal (position 90 when used with the Arduino Servo library), will cause the FS90R to stop, a 2ms pulse signal (position 180) will cause the FS90R to rotate full speed counterclockwise, and a 1ms pulse signal (position 0) will cause the FS90R to rotate clockwise at full speed. The FS90R servo includes an adjustment potentiometer to calibrate the middle-point (stopped) setting. Calibrate this setting by sending a 1.5ms (1500µs) pulse signal (position 90 when used with the Arduino Servo library), then slowly turn the middle-point adjustment potentiometer until the servo stops rotating. Access the middle-point adjustment potentiometer by inserting a small screwdriver into the hole in the bottom of the servo, see diagram below. The servo's cable has a standard JR-style connector on the end. Product Contents: 1 — FEETECH (formerly Fitec) FS90R Continuous Rotation Servo 1 — straight single-ended servo horn 1 — straight double-ended servo horn 1 — winged straight double-ended servo horn 1 — four-pointed star servo horn 1 — round servo horn 1 — servo horn screw 2 — FS90R servo mounting screws Specifications: Operating Voltage 4.8V 6.0V Stall Torque 1.3 kg/cm (18.09 oz/in) 1.5 kg/cm (20.86 oz/in) Max Speed 110 RPM 130 RPM Idle Current 5 mA 6 mA No Load Running Current 100 mA 120 mA Stall Current 550 mA 650 mA Operating Voltage Range 4.8V to 6V Pulse Width Range 700 to 2300 µs Dead Band Width 90 µs Stop Signal 1500 (±45) µs CW Rotation Signal Range 700 to 1500 µs CCW Rotation Signal Range 1500 to 2300 µs Internal Gears Plastic Cable Length 23 cm (9.06) Dimensions (detailed dimensions) Length 32.6 mm (1.28) Width 12.5 mm (0.49) Height 27.3 mm (1.08) Weight (of servo itself) 9 g (0.32 oz) Weight (including horns and screws) 15.1 g (0.53 oz) Bottom View Middle-Point (Stopped) Adjustment Potentiometer We also carry an FS90R Compatible Wheel Connector Pinout: Resources: FS90R Servo Datasheet Arduino Servo Library Tutorials Knob: control the servo's speed and direction of rotation with a potentiometer Sweep: spins the servo's shaft one direction and then the other direction Dimensions (units in mm) Click on image to view full size

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