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Parallax 900-00008 Manual
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Parallax 900-00008 Manual

Continuous rotation servo kickstart
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Parallax Continuous Rotation Servo KickStart (#900-00008)
What It Can Do
High-torque geared motor interfaces easily to wheels and other mechanics
•
Speed control of motor from slow to full, in both directions
•
Motorizes most anything, such as a robot or model car
•
Standard servo motors made for hobby radio-control are designed to spin in a limited circle. The
Parallax Continuous Rotation (CR) Servo has the same size and shape as a standard servo, but
it's made to keep turning clockwise or counterclockwise.
The control signal for a servo is a stream of pulses. The exact duration of these pulses, in
fractions of a second, is what determines the position of the servo. Each pulse is from 1300 to
1700 microseconds (μs) in duration — one microsecond is one millionth of a second. The pulses
repeat about 50 times each second (once every 20 milliseconds).
1300 μs: Turn clockwise
•
1500 μs: Stops the motor
•
1700 μs: Turn counterclockwise
•
Copyright © Parallax Inc.
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Technical: support@parallax.com
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Tech Support: (888) 997-8267
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Summary of Contents for Parallax 900-00008

  • Page 1 Standard servo motors made for hobby radio-control are designed to spin in a limited circle. The Parallax Continuous Rotation (CR) Servo has the same size and shape as a standard servo, but it’s made to keep turning clockwise or counterclockwise.

  • Page 2: Parts List

    You can apply timing pulses shorter than 1300 μs and greater than 1700 μs; however, motor speed is not increased beyond these values. Parts List Parallax Continuous Rotation Servo • BASIC Stamp HomeWork Board, Propeller Board of Education, Propeller QuickStart, or Arduino •...

  • Page 3: Basic Wiring

    Slowly adjust the control using a small (#0 or #1) Phillips screwdriver while applying a stream of 1500 μs pulses to the servo, 20 ms apart. Calibration programs are provided in this KickStart. Copyright © Parallax Inc. Page 3 of 8...

  • Page 4: Calibration Program

    BASIC Stamp 2 HomeWork Board Calibration Program '{$STAMP BS2} '{$PBASIC 2.5} ' Repeat forever PULSOUT 0, 750 ' Stop PAUSE 20 LOOP Copyright © Parallax Inc. Page 4 of 8...

  • Page 5: Demonstration Program

    A servo can drain a fresh 9 V battery in less than 20 minutes. For tips on using a separate power supply for a servo on the HomeWork Board, see the Parallax servos product pages (see For More Information, at the end of this document).
  • Page 6 _clkmode = xtal1 + pll16x _xinfreq = 5_000_000 ServoCh1 = 0 ' Servo to pin 0 PUB Servo32_DEMO | temp SERVO.Start ' Start servo handler repeat SERVO.Set(ServoCh1,1700) ' Pin, width -- CCW repeat 800000 ' Wait Copyright © Parallax Inc. Page 6 of 8...
  • Page 7 The Servo32v7 object is included in the download archive file. See using Propeller object libraries for more information on using Propeller object files. Arduino Uno Calibration Program #include <Servo.h> Servo myServo; void setup() { myServo.attach(9); myServo.writeMicroseconds(1500); // Stop void loop() { } Copyright © Parallax Inc. Page 7 of 8...
  • Page 8 The product pages for the standard and continuous rotation servos provide downloads for the • full product documentation and wiring diagrams for separate power supplies. Several Parallax development and education boards provide integrated 3-pin headers for easy • connecting to servos (either 4 or 6 headers, depending on the board). These products...