How to get my serial.print to be written into csv file

[awneil]

Again, Do you want to save it into a file on the Arduino, or have the serial data still received by the PC, and saved to a file there?

Here's another option for the latter:

https://www.windmill.co.uk/serial.html

And an example using Python on the PC:

Demo of PC-Arduino comms using Python

I haven't been able to find a piece of example code (both the Python and the Arduino stuff) that can reliably send and receive text and/or binary data between a PC and an Arduino. So I have written a pair of demo programs - one in Python and one for the Arduino - in the hope that they might be useful to newcomers. I have written the programs on a Linux PC. It would be great if someone could let me know if they work on Windows and Mac systems. I originally wrote the Python program in JRuby as I…