I’m new to PWS; I’m setting up a Acurite 5n1 Iris, utilizing a rtl_433/MQTT. The unit is mounted at about 12 ft, on a PVC mast. The rain sensor is cumulative, with the initial reading being 0.170 in (it’s totally dry, no rain as yet).
Did you ever get an answer to this? I have the same problem as you where I never get a 0 (zero) reading out of the Rainfall senor (also a AcuRite 5in1 - same model).
It turned out that creating a utility meter that resets itself at midnight was the way to go. I ended up creating meters for daily/weekly/monthly/yearly. Right now though. I have no weather in HA. I moved my radio to a different system and am playing hobb getting it working with HA again. But that’s another topic.
Interesting, I will definitely look into incorporate a Hubitat hub to support my Acurite 5 in 1 weather station.
Whats the best personal weather station with rain tracking that integrates with HASS?