Posted in home hacks Tagged chemical sensors, ESP32, home-assistant, hot tub, mqtt, ORP sensor, pH sensor Dip Your Toes In The Open Water Of Raspipool October 9, 2019 by Kristina Panos 25 Comments ...

There’s also industrial FET based pH sensors that don’t need calibration ... Many of those probes are connected to pH readout circuitry I designed, also ESP32 based and interfaced with ModbusTCP.

As I've experimented and played with a lot of different sensors, I've discovered that these basic devices can be built for ...