Summary: Why can I upload sketches to a Mega 2560 board by itself, but not when it is connected to a robotic arm? I am using a Mega 2560 with a sensor shield v2 from Sainsmart to control a 4-axis robotic arm. The 2560 is connected to a Mac and to power using a two-pronged USB cable. One prong goes…

[fixed] Connecting Mega 2560 & Sainsmart 4 axis arm, avrdude and port # changing

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