Hello, I'm powering a small dc motor using the L293D motor drive.
However if the motor draws more then about 200 mA the screen connected to my laptop turns off for a sec, so the hdmi signal gets interrupted. The motor is powered by an external power source(9v battery) so I think it's happening because of a ground loop since the arduino operates on 5V and the 9V battery on... well 9 volts and both grounds are connected to the L293D ground pins. So how to medigate this difference in ground paths? please let me know!
Please post schematics. Words can't substitute it.
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A ground loop is not likely.
Please post a photo of a hand drawn wiring diagram, with all pins and parts clearly labeled.
Small 9V batteries (unless LiPo) have very little current ability, not enough for a motor. The power is thus being diverted from the L293D's logic supply and crashing the screen.
Get a supply capable of an amp or two for the motor and this shouldn't happen.
That makes sense, I tested it with an adapter (5V 1A) and no problem indeed! Thanks alot
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