Formula used to convert temperature, humidity, Ph and pressure of soil into soil NPK without using NPK sensor

Projects General Guidance
2

have a read of how-to-get-the-best-out-of-this-forum
in particular:

  1. what microcontroller are you using
  2. what sensors are you using - give links if possible
  3. upload any code - select < CODE/ > and paste text where it says “type or paste code here”
  4. what output do you get from the code on the serial monitor