In article , tony sayer
wrote:
In article , charles
scribeth thus
In article , dennis@home
wrote:
On 14/04/2018 13:29, tony sayer wrote:
A nodeMCU will almost certainly do everything you want including
logging to a remote database.

Problem is dealing with mains AC voltages and having to reduce
them first.




Isolating transformers isolate the mains and reduce them to safe
levels.


Care to expand of that statement Dennis?..


What's to explain? they isolate the mains unlike autotransformers or
some other ways to drop mains voltage. You aren't going to get a sever
shock from a 6V isolating transformer like you could from a potential
divider using resistors.

a 6v transformer is just a transformer. Isolating transformers do just
that _ they isolate - mains level voltage on the output. Used to be an
essential workshop item when dealing withn live cahssis equipment.


Indeed they were, still got one 240 in and 240 out at around 5 kW..

Mine's not a big as that, but still quite heavy.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle