Evolution of a Blog

This blog has evolved as I have as a maker. It starts at the beginning of my journey where I began to re-tread my tires in the useful lore of micro electronics and the open-source software that can drive them. While building solutions around micro-electronics are still an occasional topic my more recent focus has been on the 3D Printing side of making.

Saturday, November 3, 2012

Python to Arduino Interface - Part 3 - Version 2

This is an update to the posts that described my original Python to Arduino Interface.  I upgraded the interface to add an option for generating exceptions on error and to return values directly from a read function.

The download includes a script named zzTestVoltage.py that illustrates the use of exceptions for error processing:

    print "Throw error exception test"
        testVoltage = float(my_board.analogRead(999)) * .0049
    except interfaceError as err:
        print err.message

The other change implemented in this version is to return values from functions such as analogRead directly rather than as an attribute to the class.   This is illustrated above as well. 

If you would rather not throw exceptions you will need to check the value of the returnStatus attribute to ensure there has not been an error:

    testVoltage = float(my_board.analogRead(5)) * .0049
    if my_board.returnStatus != 0:
        print "Error on analogRead = " + my_board.returnDebug

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