Water Meter or "How to get Home Assistant to send saved data to an Arduino"

[OldSurferDude]

This is a pretty basic project except that the trick was to get Home Assistant (HA) to store the cumulative water usage and then send it back after an Arduino (re)boot.

Here is a link to my documentation, such as it is.

And a link to the Arduino code. (the HA side is in the previous document)

see also How I delete a node from HA and start over