I am using an uno with one motor shield. I am using 2 12v 3000mAh batteries to power the shield and board. My code runs perfectly when the usb is connected to the board and doesn't run right at all without it. Any suggestions? Below is my code. #include <Servo.h> Servo myservo1; Servo myservo2; …

Arduino won't properly run sketch without USB plugged in

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