So far, I got the system to control the temperature and monitors the pH of a water tank. The temperature/heating system works on one circuit with a built-in display. The pH system works on a sensor attached to a circuit which is connected to an Arduino Uno that is connected to an OLED display to show its output. I want to add a dissolved oxygen measuring meter as well but I would like to combine all these sensors' output to an Arduino in order to analyze it all from one source instead of having too many circuits everywhere.
Is there a circuit with all these sensors attached, which connects to an Arduino from which I can output the data through bluetooth or cellular data to a smart phone?