Plans to build a pool controller that:
Uses an ESP32-WROOM-32E mounted on an 8 relay board with a hall effect flow sensor (flowrate), an input\output thermistor (temperature), a TDS meter (Salinity), and a PH sensor tbd.
This will control a variable speed pump and a heater and be controlled using an IOT mobile app developer like Ardunio web or Blynk to allow cross platform control (iPhone or Android mobiles)