Introduction

The pYpHpoT is a Python script that reads the data from the pHduino and plots the pH and the temperature and save the data in a text file.

This software is multiplatform and runs in Linux , Windows and MacOSX (the last one was not tested, yet).

Dependence

• Python <http://www.python.org/>
• numpy <http://numpy.scipy.org/>
• pyQt <http://www.riverbankcomputing.co.uk/software/pyqt/download>
• pyQWT <http://pyqwt.sourceforge.net/download.html>
• pyserial <http://pyserial.sourceforge.net/>

Pay attention to the packages versions.

TIP: Read the second topic about the pyQWT installation at the download page.

http://pyqwt.sourceforge.net/download.html

Editing the GUI

The Graphical User Interface (GUI) is encoded in the pyphpot.ui file. You can modify the GUI using the GUI Editor QtDesigner.

http://qt.nokia.com/

Most Linux distributions have the QtDesigner in the repositories.

After a modification in the pyphplot.ui, you need run pyuic4 to converts a ui file to a python module. It is very important don't change the files names.

For example

Linux machine

# pyuic4 pyphpot.ui -o pyphpotui.py

Windows machine

$ pyuic4 pyphpot.ui > pyphpotui.py

At the end, run the python script.

Troubleshootings

If you had a problem like this

$ python pyphplot_v01.py

Traceback (most recent call last):

  File "pyphpot_v01.py", line 8, in <module>

    from pyphpotui import Ui_MainWindow

  File "/home/me/Projects/pyphpot_v7/pyphpotui.py", line 135, in <module>

    from qwt_plot import QwtPlot

ImportError: No module named qwt_plot

Open the pyphplotui.py in a text editor and change the line from

from qwt_plot import QwtPlot

to

from PyQt4.Qwt5 import QwtPlot

Reference:

http://www.riverbankcomputing.com/pipermail/pyqt/2006-August/013960.html

Tips

Adjust the acquisition time to avoid huge data files. To do this, open a serial terminal and use the command interval_ms. Remember: temperature and pH are slow measurements.

The date and time format is the ISO 8601.

http://en.wikipedia.org/wiki/ISO_8601

Check the serial port name out of the pHduino. Examples of serial ports are:

Linux: /dev/ttyUSB0

Windows: COM1