Cool post on Medium from Simon Prickett.Having written guides describing how to use the Low Voltage Labs traffic lights with the Raspberry Pi for Python (read Python article), Node.js (read Node.js article), C (read C article), Bash scripting (read Bash article) and Go (read Go article), it’s definitely time to check out how to access the GPIO pins from the Java programming language.
To make this a standalone guide, there will be some re-use of content from the prior articles in this one..

Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time! // Read more: original article.

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