Tag: python

February 15, 2011

You can typically view the signature of an object (i.e. a list of its instance files and methods) using the dir method.For example, the python segment below

class Foo:
    def __init__(self):
        self.first = 'Aaron'
        self.last = 'Gember'

f = Foo()
dir(f)

results in the following output from dir

['__doc__', '__init__', '__module__', 'first', 'last']

Categories: Development

Tags: python

January 27, 2010

Phidgets are boards for sensing and control projects that are managed via a USB connection to a computer. I use the Phidget Interface Kit 0/0/4 for my Christmas light controllers. To control the boards from a Linux workstation, it is necessary to install the Phidgets driver. To allow connectivity to Phidgets from Fedora 12 (or Fedora 10 or 11):

1. Download the Phidget source: http://www.phidgets.com/drivers.php
2. Untar the contents and change to the phidget21 directory.
3. Run make, then sudo make install.
4. Copy the udev configuration file to the appropriate location.

   sudo cp udev/99-phidgets.rules /etc/udev/rules.d/

5. Restart udev.

   sudo /etc/init.d/udev-post reload

6. Connect (or unplug and reconnect) the Phidget board to an available USB port.

I typically control the Phidget board using Python. To install the necessary Python modules:

1. Download the Python module source: http://www.phidgets.com/programming_resources.php
2. Unzip the module.
3. Move the Phidgets directory to the standard location for Python modules.

   sudo mv Phidgets/ /usr/lib64/python2.6/

Categories: Development, Linux

Tags: fedora, phidgets, python