enter image description hereHow can use a separate power source for powering Arduino, and another battery for powering the motors? How can I make connections through the motor driver module L298N? I know how normally we use one battery to power the Arduino as well as the motors. But I am facing the problem while using different power sources.

  • make sure all ground pins are connected together. And please edit your answer and insert a photo of your setup so others can spot your problem
    – bb1950328
    Commented Oct 21, 2020 at 16:54
  • I added the Image and want to know how the pins are connected when separate power source are used Commented Oct 21, 2020 at 17:04
  • please edit the image so it's clearly visible which cable goes to which terminal, especially on the arduino and the L298 module
    – bb1950328
    Commented Oct 21, 2020 at 17:06
  • That's what I want to know Commented Oct 21, 2020 at 17:07
  • seems correctly connected ... two control signals and ground connected between the arduino and the motor driver
    – jsotola
    Commented Oct 21, 2020 at 17:34

1 Answer 1


That motor driver has an optional on-board 5V regulator. It can be enabled / disabled with a jumper.

With that regulator enabled you just need to connect a ground and your control signals (ENA/IN1/IN2 or ENB/IN3/IN4).

If you disable that regulator (remove the jumper) then you need to provide power from the Arduino's 5V pin to the +5V screw terminal.

The ENx pin(s) (after removing any jumpers that may be on them) connect to any PWM capable pin (this is the speed control pin). IN1/IN2 or IN3/IN4 connect to any IO pin since these are just used to set the direction or control the braking modes. ENA controls the speed of motor 1, and IN1/IN2 control the direction of motor 1. ENB and IN3/IN4 are likewise for motor 2.

  • You mean to say that do not remove the jumper of the 5v regulator and then connect the ENA/IN1/IN2 And It's ready. Commented Oct 22, 2020 at 8:58
  • PLus ground, but yes. That's right.
    – Majenko
    Commented Oct 22, 2020 at 9:01
  • And the battery connections Commented Oct 22, 2020 at 9:03
  • Well, yes, of course. Without those there will be no power...
    – Majenko
    Commented Oct 22, 2020 at 9:04
  • So I will be able to power the arduino with a separate battery or through USB. And what about the motor driver connections with the other battery for motors. Commented Oct 22, 2020 at 9:06

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