I'm trying to control my 3v motor from my 5v arduino.

For this i use :

  • 5 volt power source from pc for the arduino
  • L9110 H-bridge module
  • 2 AA Battery as power source for the L9110 H-bridge

Here is the setup :image

however if I touch the h-bridge pin with the 5v source from the arduino (red cable on the image), nothing happens....

Any idea ? if I power the motor directly from the battery, the motor works

Maybe the problem is that I have 2 different power source


You need to complete a circuit in order for the current to flow. Creating a common ground between the power sources (connecting the grounds together) should fix the problem.

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