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. 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 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 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) Specs Datasheet
