Web Site: www.parallax.com Office: (916) 624-8333 Forums: forums.parallax.com Fax: (916) 624-8003 Sales: sales parallax.com Sales: (888) 512-1024 Technical: support parallax.com Tech Support: (888) 997-8267 Parallax Feedback 360 High-Speed Servo ( 900-00360) 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. Like most servos, the Feedback 360 is controlled by a 50 Hz PWM 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 make 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 as a robot drive motor. Control signal response is nicely linear across the speed control range. BlocklyProp blocks and user-friendly C Propeller C libraries are in the works. Low-level position control example C code is discussed in this guide. Features Bidirectional, continuous, feedback-controllable, low-load rotation from -120 to 120 RPM PWM positional feedback across entire RPM range Internal Hall effect position sensor 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 Boards 3- pin header Separate single wire with female connector supplies feedback to an I/O pin Specifications RPM: 120 w/feedback control, 140 max (+/- 15) 6 V, no load Gears: POM Case: Nylon & fiberglass Spline: 25-tooth, 5.96 mm OD Peak stall torque 6 V: 2.5 kg-cm (34.7 oz-in) Voltage requirements: 6 VDC typical, 58.4 VDC max range Current requirements: 15 mA (+/- 10) idle, 150 mA (+/- 40) no-load, 1200 mA stalled Control signal: PWM, 35 V 50 Hz, 12801720 s Control signal zero-speed deadband: 14801520 s (+/- 15) 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) Resources and Downloads Check for the latest version of this document, free software, and example programs from the Feedback 360 High-Speed Servo product page. Go to www.parallax.com and search 900-00360. Copyright Parallax Inc. Parallax Feedback 360 High-Speed Servo ( 900-00360) v1.2 9/12/2017 Page 1 of 7 Quick-Start Circuit Pin Descriptions Pin Name Description Min Typical Max Units Yellow Feedback Servo output, PWM, 910 Hz, 2.797.1% duty cycle 3.3 V White Control Servo input, PWM, 50 Hz, 12801720 s 3.3 3.3 5.0 V Red Vservo Servo power supply 5* 6 8.4 V Black Vss Ground, common ground with microcontroller 0 v *5 VDC is absolute minimum required for no-load angular position control. 5.8 to 8 VDC is recommended for continuous rotation speed control. Control Signal The servo requires an input control signal sent from your microcontroller via the white wire connection. This signal, labeled tControl in the diagram and table below, is the time in microseconds of a 3.3 to 5 V high pulse. The control signal must be sent every 20 ms. The duration (pulse width) of tControl determines servo rotation speed and direction as shown in the table below. The top speed will vary with supply voltage and load. Clockwise (faster to slower) Stop Counterclockwise (slower to faster) tControl, 1280.1480 1480...1520 1520.1720 +/- 10 s RPM, +/-15 140...0 0 0-140 Copyright Parallax Inc. Parallax Feedback 360 High-Speed Servo ( 900-00360) v1.2 9/12/2017 Page 2 of 7