Contec CMS50D+ Pulse Oximeter Data Downloader
=============================================

This python script can download both live data and recorded data from a Contec 
CMS50D+ pulse oximeter into a standard CSV file for further analysis.

In live data mode the device will sample at 60 Hz. Each sample is saved to CSV 
along with the current wallclock time (in UTC). For recorded data you'll have
to provide a start time as the device doesn't provide any historic timestamps
at all. In this mode we assume a sample rate of 1 Hz.

For more details, see my blog post at http://www.atbrask.dk/?p=244

History
-------
1.0 (2015-03-24) Uploaded initial version to GitHub
1.1 (2015-03-26) Added support for downloading recorded data
1.2 (2015-09-28) Added time column to output CSV for both modes

Syntax
------
usage: cms50dplus.py [-h] [-s STARTTIME] {LIVE,RECORDED} serialport output

cms50dplus.py v1.2 - Contec CMS50D+ Data Downloader (c) 2015 atbrask

positional arguments:
  {LIVE,RECORDED}       Specify LIVE for live data or RECORDED for recorded
                        data.
  serialport            The device's virtual serial port.
  output                Output CSV file.

optional arguments:
  -h, --help            show this help message and exit
  -s STARTTIME, --starttime STARTTIME
                        The start time for RECORDED mode data.


Example
-------
If you have the device connected as /dev/ttyUSB0 and want live data saved as
foo.csv, then the program can be run like this:

./cms50dplus.py LIVE /dev/ttyUSB0 foo.csv

Likewise for recorded data:

./cms50dplus.py RECORDED /dev/ttyUSB0 foo.csv -s "2015-01-01 12:34:56"