I am looking to develop a supervisory for arduino with Lazarus. Does anyone know where there is some material where I can read? Do I have an application on Lazarus where I can communicate with the Arduino or do I have to download some other program?
You can use Lazarus + FPC to write a program that can use a serial port to communicate with a "sketch" that is running on an Arduino.
Note that you will either have to write two programs, i.e. one each end of the serial link, or will have to have something running on the Arduino with a well-defined protocol which you understand how to use.
Your use of the word "supervisor" is a very poor choice. Do you mean "a program running on a PC to supervise an Arduino"? Or do you mean "a program running on an Arduino supervising sensors"? Or do you mean "a supervisory program- i.e. an operating system- running on an Arduino"?
MarkMLl