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So I have 3 ground pins, but I need 4 motors on my Arduino. Can I connect multiple motors to the same ground pin?

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    Arduino cannot power a motor directly
    – Paul
    Apr 8, 2015 at 5:05

3 Answers 3

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You can do it as long as the current isn't excessive. I don't think there are any specs available, but the connector and the width / thickness of the copper tracks on the PCB will be the limiting factor.

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All ground is internal connected.
But anyway, you CANNOT use the Arduino's power to power a motor, you will need an external power source.And again, you will connect the external power source's ground to the Arduino's ground.

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    If you power a motor directly from an Arduino, the Arduino's microprocessor (e.g. AtMega328P) will get fried.
    – Mathsman 100
    Apr 13, 2015 at 10:59
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    And while using the motors, make sure that the motor does not touch the Arduino board
    – Mathsman 100
    Apr 13, 2015 at 11:00
  • How do I control the motor then? I need to control the speed of the motor. How would I do this?
    – Mathias Bøgebjerg
    Apr 13, 2015 at 21:41
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    link for more info on how to do that.
    – Mathsman 100
    Apr 14, 2015 at 8:31
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    If you are having problem in coding, comment here and I will give you some sample codes.
    – Mathsman 100
    Apr 14, 2015 at 8:32
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You can connect multiple components to a single ground pin. IF you are using a breadboard, be sure to put the wire going to the go

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