Hum & temp working. Repeating measurement using timer wrapper. Need to include user input options
Timer working ok, adding code for user input (using threading)
Code working well.

Writing to file (and console to debug), can change measurement interval or quit from command line. Should be creating a new file every day - need to leave overnight to test
Exchanged temp/hum order in serial comms. Commented Python code nicely. Removed some debugging lines.