Non-contact approach for measuring AC VAC/I and PF

[Geoff-AU]

People who use Arduino are not a reliable source of code for me personally.
Professionals use other means. 

Yep, if you don't grow your own silicon crystals you're just a hobbyist. 

We all stand on the shoulders of giants.  It's what makes the complexity of 21st century life possible.  There is a risk of forgetting first principles if EVERYBODY does it, for sure.  But I have never written a compiler, nor do I have any desire to.  I get more enjoyment out of using one than making one, I'm simply using the compiler as a tool to make other things that I do enjoy making.  Other people make compilers and that's great.  It's not easy to do it well.