Reading from a Text File

Hey, guys! I have a program which automatically downloads a .csv file every five minutes. I am saving the last number of the file to a text file, and I want my Arduino to read that number from the text file. I have checked other forums, and most of them say that it is another form of serial data, but I'm still confused as to how that works. Can anyone explain it to me? Thanks so much!

I assume your text file is located on your HDD. Arduino can't read it. If you have a serial connection between computer and Arduino, you can have a program read the text file and send the data over serial port. I guess the easiest way to do it is to use processing as it is very similar to Arduino programming. Look at this video. Tutorial 06 for Arduino: Serial Communication and Processing - YouTube