I have a 4xAA battery powering the 4 dc motors on a typical plastic chassis via a L293D motor shield. The car uses the ultrasonic sensor and code to avoid obstacles. The issue Im having is that when the UNO is plugged into the 5V from the usb cable and the 4xAA are powering the L293D shield, all wor…

L293D motor shield power sources

Marciokoko October 23, 2017, 5:53pm 5

But why when I connect the 4xAA batteries to the shield and the 9v to Arduino does the 9v battery get drained?

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