Hi -- I'm planning to use an HCPL3700 as shown in this post to detect 120VAC with an Arduino Nano Every GPIO pin.
I know that the output (pin 6, aka VO) goes low when AC is detected -- is this a steady state low, or is it going to bounce high/low with every AC cycle? I think it's the former, but some things I've read seem to imply that it will be toggling with the AC. I guess the cap across pins 2/3 is smoothing the rectified input, so maybe that answers my question, but I just want to be sure!
I've seen pretty different values used for that pin 2/3 cap -- I was planning to go with 10uF as shown in that schematic...
Some implementations with the HCPL3700 use what appears to be a pull-up resistor between pin 6/VO to Vcc... if I'm going into the Nano Every and I set INPUT_PULLUP, I won't need this extra resistor, correct?
What is Your education regarding mains elextricity? You're adviced not to proceed with this way of detecting mains.
Using a phone chargers 5 volt output is much safer.
Look at "Test circuit" down in the datasheet. It shows that.
INPUT_PULLUP should work.
I appreciate the concern; my education is minimal and ad-hoc; while I will always be humble here in this forum of people far more knowledgeable than me, I have wired a couple houses with mains electrical (inspected jobs), and done enough working with it in circuits to feel reasonably capable of not starting any fires or zapping anyone.
