- only the ports mentioned in Interactive_to_Serial_with_Details sketch could be used or can I use different ports?
If you mean pin numbers, they can be changed - but why?
- if I have to add the OSCCAL = 0xAD to a sketch which are the needed includes?
In Setup() , see the example below
- what command to use to get data from serial port
In this example pin 4 is the receiving pin, and pin 3 the transmitting pin
SoftwareSerial mySerial(4, 3); // RX, TX
OSCCAL = 0x59; //ATiny85