Hi out there.
I am planning to automate my new swimming pool with HA and an ESP32 connected to PH/Redox pressure and temperature sensors (4-20mA). Stepper motor shields are used to drive the dosing pumps and the two pool pumps are to be controlled by modbus VFDs.
I am running HA on a Raspberry Pi 4b China model and the pool is controlled by a single ESP32 38 pin module.
Hope this will work …