Parallax's High Speed Continuous Rotation Servo offers easily controlled bi-directional rotation via simple pulse-width modulation. With about 3 times the RPM of the original Parallax Continuous Rotation Servo, it makes an excellent drive motor for small, zippy robots.

The Parallax Feedback 360° High Speed Servo provides the functionality of a light-duty standard servo, continuous rotation servo, high-speed servo, and encoder in one convenient package. This is the servo on the ActivityBot 360° Robot.

Like most continuous rotation servos, the Feedback 360° is controlled by a 50 Hz pulse-width-modulation signal. What sets it apart is a return signal line from an internal Hall effect sensor system that provides digital angular position feedback.

Utilizing this feedback signal, your application can cause the servo to turn to and hold any angle, much like a standard servo but with an unlimited range of motion. Or, rotate the servo continuously at a controlled, verifiable speed—up to 120 RPM—as a robot drive motor. Control signal response is nicely linear across the speed control range.

Key Features:

High Speed Continuous Rotation Servo:
- Bidirectional continuous rotation, from 0 up to 180 RPM
- Linear response to pulse-width modification for easy ramping
- 6 to 8 VDC input range is compatible with 5-cell AA battery packs
- Accepts four mounting screws, and fits easily into our small robot chassis
- Access port for adjusting "idle" pulse width
Feedback 360° High Speed Servo:
- Bidirectional, continuous, feedback-controllable rotation from -120 to 120 RPM
- PWM positional feedback across entire angular range
- Internal Hall effect position sensor, which is not subject to wear or sensor deadband as are potentiometer-style feedback systems
- No need to manually “center” the servo
- 3-pin ground-power-signal cable plugs onto the Activity Board’s 3-pin header
- Separate single wire with female connector supplies feedback to a separate I/O pin
- Fits our Small Robot Wheel and Tire and Servo Wheels

Specifications:

High Speed Continuous Rotation Servo:
- Torque: 22 +/-11 oz-in (1.6 +/- 0.8 kg-cm) @ 7.4 V
- Speed: 0.30 +/- 0.06 sec/360°
- Weight: 1.5 oz (42 g)
- Gear material: Acetal copolymer
- Power requirements: 6.0 to 8.0 VDC; 15 mA idle, 130 +/- 50 mA full speed no load @ 7.4 V
- Communication: pulse-width modulation, 1.3 to 1.7 ms high pulse, 20 ms intervals
- Dimensions: 2.2 x 0.8 x 1.6 in (56 x 19 x 41 mm) excluding servo horn
- Operating temperature: 14 to 113 °F (-10 to +45 °C)
Feedback 360° High Speed Servo:
- RPM: +/-120 w/feedback control, 140 max (+/- 10) @ 6 V, no load
- Gears: POM
- Case: Nylon & fiberglass
- Spline: 25-tooth, 5.96 mm OD
- Peak stall torque @ 6 V: 2.2 kg-cm (30.5 oz-in)
- Voltage requirements: 6 VDC typical, 5–8.4 VDC max range*
- Current requirements: 15 mA (+/- 10) idle, 150 mA (+/- 40) no-load, 1200 mA stalled
- Control signal: PWM, 3–5 V 50 Hz, 1280–1720 µs
- Control signal zero-speed deadband: 1480–1520 µs (+/- 10)
- Feedback sensor: Hall effect
- Feedback signal: PWM, 3.3V, 910 Hz, 2.7–97.1% duty cycle
- Product weight: 1.4 oz ( 40 g)
- Cable length: ~ 9.8 in (250 mm)
- Dimensions: approx. 2.15 x 1.46 x 0.79 in (50.4 x 37.2 x 20 mm)
- Mounting hole spacing: 10 x 49.5 mm on center
- Operating temperature range: 5 to 158 °F (-15 to +70 °C)v