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Is here some easy way to control bipolar motor without using any other external devices, drivers or shields? I have small motor from CD-ROM so I expect it's low voltage. By control I mean just turning clockwise and anti-clockwise and speed. I'm looking for easy to make circuit not just direct control from Arduino.

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    It depends on the motor but is quite unlikely for most motors due to the limited current (and voltage) the Arduino's GPIO pins can provide. – Ghanima May 2 '17 at 19:23
  • I have 4 wire motor – ChickenLover May 2 '17 at 19:31
  • Please give us more details. It will attract better answers. – SDsolar May 2 '17 at 20:08
  • Welcome to Arduino SE. Be sure to take the tour to see how things work here: arduino.stackexchange.com/Tour – SDsolar May 2 '17 at 20:08
  • Please edit your question (click the edit button, etc) and tell what you mean by control – ie, turning the motor on/off, or changing direction or speed, etc. Also list motor model number or specs – a low-voltage micromotor might not need external parts, but most motors will. If you improve the question people may vote it up. – James Waldby - jwpat7 May 2 '17 at 20:40
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No. You cannot directly drive any bare motor directly from an Arduino without any external components. To do so will damage the Arduino.

You need a motor driver (or at least some transistors and diodes etc) to control the motor.

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Taking a guess here, the current this motor requires will be exceeding the safe operation limits of the Arduino's GPIO pins. Furthermore without a flyback diode the voltage spike across the motor (an inductive load) when the current is reduced/switched off might kill the GPIO pin.

You will need a motor driver or transistor with flyback diodes to operate it.

This is a nice tutorial that has it sorted out for a CD ROM brushless motor.

  • It's not just about the current - back EMF from the motor's coils will do nasty things to the Arduino. – Majenko May 2 '17 at 21:30

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