Creative Technologies > Block 4 > Concepts > Continuous rotation servo

Continuous rotation servo

Try out the continuous rotation servo. You control the continuous rotation servo by writing a speed to it instead of a position.

Example 4.2

In this example, you will use the exact same code as in the previous example, but this time with a continuous rotation servo.

Materials

  • 1 Arduino Uno board
  • 1 Education Shield
  • 1 continuous rotation servo

Instructions

  1. Attach the shield onto the top of the Arduino board.
  2. Connect the continuous rotation servo to D9.
  3. Upload the following code:


Result


The servo should spin in one direction for one second, then spin in the other direction for another second, and repeat.


New commands


    

  • servoName.write( speed ): makes the continuous rotation servo rotate with the specified speed. speed can be a value between 0 and 180 where 0 is full speed in one direction and 180 full speed in the opposite direction.
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How it works


    

  • The Servo library is included.
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  • The Servo object myservo is declared.
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  • In setup(), myservo is attached to pin 9.
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  • In loop(), the servo shaft is rotated continuously with speed 0, full speed counter clockwise.
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  • The program pauses for 1000 milliseconds.
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  • The servo shaft is rotated continuously with speed 180, full speed clockwise.
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  • The program pauses for another 1000 milliseconds.
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  • loop() continues to loop.
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Learn by doing


    

  • See what happens when you change the values inside the write() function.
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  • Determine the value that makes the servo stop rotating.
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