[proee]

Just be aware of dorking around with exposed hardware connected to your $2K MBP. If you end up shorting out your DIY circuit, or have external power supplies connected to your dev board, it's very possible you can fry your laptop.

Best practice is to have a completely opto-isolated USB connection between your dev system and test hardware. You can buy a USB opto-isolated system for like $100 that will tell you downstream currents and isolate your hardware.

[bxbdbehdbdb]

I have to second this. Multiple Mainboards in my company were fried before mandatory opt isolation of USB fixed the issue