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 High Speed Continuous Rotation Servo ( 900-00025) Parallaxs 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. Features Bi-directional continuous rotation Up to 150 RPM 6 VDC, or 180 RPM 7.4 VDC Linear response to PWM for easy ramping Accepts four mounting screws 3-pin ground-power-signal cable and female header with 0.1 spacing for quick connection Easy to interface with any Parallax microcontroller or other PWM- capable device Very easy to control examples available for many programming languages Key Specifications Power requirements: 6.0 to 8.0 VDC Maximum current draw 130 +/- 50 mA 7.4 VDC when operating in no load conditions, 15 mA 7.4 VDC when in static state Communication: pulse-width modulation Speed: 0.30 +/- 0.06 sec/360 Torque: 22 +/-11 oz-in (1.6 +/- 0.8 kg-cm) 7.4 V Weight: 1.5 oz (42 g) Dimensions: approx. 2.2 x 0.8 x 1.6 in (56 x 19 x 41 mm) excluding servo horn Operating temperature range: 14 to 113 F (-10 to +45 C) Quick-Start Circuit Connect the servo to your microcontroller as shown in the diagram. V Vservo V = microcontroller voltage supply Vdd Vservo = 6 to 7.5 VDC, regulated or battery White I/O I/O = PWM TTL or CMOS output signal, Red 3.3 to 5 V < Vservo + 0.2 V Black Vss Microcontroller High-Speed Servo GND Copyright Parallax Inc. High Speed Continuous Rotation Servo ( 900-00025) v1.1 3/2/2015 Page 1 of 4 Pin Descriptions Pin Name Description Minimum Typical Maximum Units 1 (White) Signal Input TTL or CMOS 3.3 5.0 Vservo + 0.2 V 2 (Red) Vservo Power Supply 6.0 7.4 8.4 V 3 (Black) Vss Ground 0 V Precautions Do not use this servo with an unregulated wall-mount supply. Such power supplies may deliver variable voltage far above the stated voltage. Do not power this servo through your microcontroller. Servo current draw can spike while under peak load stall current can approach 1 A. Be sure your application s regulator is prepared to supply adequate current for all servos and other circuits used in combination. Downloads The latest version of this document is available on the High Speed Continuous Rotation Servo product page. Go to www.parallax.com and search 900-00025. Servo Control The Parallax High Speed Continuous Rotation Servo is controlled through pulse width modulation. Rotational speed and direction are determined by the duration of a high pulse, refreshed every 20 ms. A 1.52 ms control pulse makes the servo stand still (unless calibrated to 1.50 ms, see Calibration Changing the ServosCente Value, page 4). As pulse width decreases from 1.52 ms to 1.3 ms, the servo gradually rotates faster, clockwise. As pulse width increases from 1.52 ms to 1.7 ms, the servo gradually rotates faster, counterclockwise. Copyright Parallax Inc. High Speed Continuous Rotation Servo ( 900-00025) v1.1 3/2/2015 Page 2 of 4