Taking advantage of object-oriented code to control digital outputs

The previous example just turns on the LEDs. Thus, in case we want to count in a reverse order, that is, from 9 to 1, the results are not going to be as expected. After the code turns on 9 LEDs, the code will turn on 8 LEDs but there are still going to be 9 LEDs turned. The problem is that we never turn off the LEDs that we don't need to be turned on, and therefore the 9 LEDs will stay on until the edited loop finishes its execution.

We are always talking about LEDs turning on and turning off LEDs. However, we have been using just instanced of the mraa.Gpio class and called the write method. Python is an object-oriented programming language, and therefore, we can definitely take advantage of its object-oriented features to write reusable, easier to understand and simpler to maintain code. For example, in this case, it makes a lot of sense to create an Led class to represent an LED connected to our board.

The following lines...