# Do any Arduino boards come with a USB isolator?

#### Twigg

Joined Jul 25, 2015
23
I'm looking for an Arduino or other programmer-free micro-controller board with isolated USB ground. I recently made a bonehead error in the lab where I used an Uno overnight to read off a signal channel I'd amplified by a factor of 250 and had a ground loop from the input ground to the USB plugged into my laptop. I came back in the morning and found the serial data had been going back and forth between 0 (probably was saturating negative) the amp supply rail (5V). That issue's been resolved, but I still want a solution for the next time I need to use an Arduino and don't want to risk damaging my computer because of an oversight. What I'd really like is an Arduino (or other programmer-free micro controller) with an ADuM4160 or equivalent device built-in out of the box. This kit is the closest thing I've found so far, but I'd rather not spend $33 on the isolator plus$25-35 on an Arduino to have them be two loose boards with a dedicated cable. Is there a board that puts 'em together? Would I be better off making it myself? Alternatives? Thanks!

#### shteii01

Joined Feb 19, 2010
4,644
Uno has "translator" chip that translates UART into USB. So you can "sort of" say that uC is isolated. You have ATmega328P to ATmega16U2 to PC. As you can see the uC is never directly connected to PC.