I have a compact weatherproof enclosure and the onboard USB jack of my Mega is close to the edge. I didn't want to add a bulky weatherproof USB jack, so I'd like to just leave a female USB pigtail loose inside the enclosure.

The only thing is, I want to avoid the extra assembly step of soldering leads directly to the lugs on the board. I'd like to make a shield instead, with screw lug headers to attach all my wires to. That way a lot of my connections can be solderless and the assembly tech can just plug in the shield.

Can I connect the four wires of a USB cable to the header pins? I suspect I'd use Vin, GND, pin 0 and pin 1, but I'm not 100% sure. Thanks for your advice, gentlemen.

  • 1
    Have you had a chance to look at its schematic yet? Dec 7, 2017 at 19:21
  • I have, but unfortunately I could not make sense of it. Dec 7, 2017 at 19:26

1 Answer 1


No. For many reasons. No. USB is not TTL. You need an adapter to connect rx/tx pins of arduino to USB. And the on-board adapter has the DTR line connected to reset the Atmega before writing a program into it. Without it, you would need to push the reset button in the right moment.

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