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The Parallax Continuous Rotation Servo is ideal for robotics and basic movement projects. It is designed for continuous rotation and is easily interfaced with any Parallax microcontroller.
Key Features:
- Bidirectional continuous rotation
- 0 to 50 RPM, with linear response to PWM for easy ramping
- Accepts four mounting screws
- Easy to interface with any Parallax microcontroller or PWM-capable device
- Very easy to control with PBASIC's or SX/B's PULSOUT commands
- Weighs only 1.5 oz (42.5 g)
Note: Servo current draw can spike while under load. Be sure that your application's power supply and voltage regulator is prepared to supply adequate current for all servos used. Do not try to power this servo directly from a BASIC Stamp module's Vdd or Vin pins; do not connect the servo's Vss line directly to the BASIC Stamp module's Vss pin.
Details
- Power requirements: 4 to 6 VDC* , 15 -200 mA
- Communication: Pulse-width modulation
- Dimensions: 2.2 x 0.8 x 1.6 in (55.8x 19 x 406 mm) excluding servo horn
- Operating temp range: +14 to +122 °F (-10 to +50 °C)
- Torque: 38 oz-in @ 6 V
下載 Downloads & Documentation
Product Specific Downloads
相關 Additional Resources
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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
The speed of the motor, in either direction, can be controlled by applying pulses of intermediate duration; for example, 1525 μs pulses will cause the motor to turn slowly counterclockwise. At 1575 μs the motor will turn a little faster, and so on.
**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 Uno microcontroller, solderless breadboard as needed
- 22 gauge solid conductor hookup wire
Basic Wiring
Power requirements: 4 to 6 VDC , 15-200 mA
Communication: Pulse-width modulation
Dimensions: 2.2 x 0.8 x 1.6 in (55.8x 19 x 406 mm) excluding servo horn
Torque: 38 oz-in @ 6 V
Program KickStarts
Each of the example programs turn the servo counter clockwise, then clockwise, and finally stops. This movement is repeated indefinitely.
| Important! Servo motors draw only minimal current when they’re not attached to a mechanical load, such as the leg of a robot. The example connection diagrams shown here provide only modest current to the servo, so they are not intended to move heavy loads. They’re useful for demonstration only. To operate bigger loads the servo motor should be connected to its own 4.8 V to 6 V battery supply. See the links below for information on how to use separate power to operate one or more R/C servo motors. |
Due to slight differences in electronic circuitry within the CR Servo, you may need to adjust the servo mechanics so that the motor stops moving when pulses of exactly 1500 μs are supplied.
An externally-accessible trimmer control on the side of the CR Servo allows you to calibrate the stop point. 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.
