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Controlling a LED number display with JavaFX and Python on Raspberry Pi

2019-12-18 07:31:44
This is an example application from my book-in-progress Getting started with Java on the Raspberry Pi.
There is a lot more info about this topic and other code examples in the book!
You can already buy it on Leanpub and will receive all future updates!

THIS IS JUST A SNEAK PEAK!
Complete detailed description covers 17 pages in the book... :-)
In my book I explain the use of bits and bytes by using a shift register SN74HC595 IC and 5101AS LED number display.



Defining the bytes for each number

In the table below the bits are defined to get the hex/number value needed to light up the required segments (A - H) of the LED segment display:


JavaFX application

Here a little movie with the end result, sorry for the shaky breadboard recording, I should have used a tripod ;-)

The sources are available on GitHub to build and run this application which uses the LEDNumberDisplay Maven dependency I wrote about before:



Also included in the sources is a Python script which is copied to the tmp-directory on the Pi and then gets called whenever the selected bits change in the JavaFX application.

Wiring

To setup the experiment you'll need a lot of wires and a breadboard. The end result will look like this:



To make things more clear the same setup in a wiring diagram:



Conclusion

It's a really fun experiment to go through this process of setting up the components on the breadboard, writing the Python script and building a JavaFX application on top of that.

Full info is part of "Chapter 8: Bits and bytes" in "Getting started with Java on the Raspberry Pi".