table of contents
- Raspberry Pi: Access the GPIO interface with Java
- Set up the working environment
- Design of a GPIO-JNI worker
- An oscilloscope comes into play
- There is no one-size-fits-all solution
The Raspberry Pi is one of the most popular experimentation platforms for makers, developers and programmers. The small computer is varied, inexpensive and powerful. In addition, a huge and extremely active community ensures a steady flow of know-how, application scenarios, software and program code.
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A special highlight of the “Raspi” is the GPIO – a pin header on the circuit board, via which signals can be sent and received. GPIO can be used to query data from sensors, control servos and stepper motors or trigger switching processes. Model cars learn autonomous driving and robots are brought to life. In short: GPIO is a universal interface for MSR (measurement, control, regulation).
The range of programming languages with which one can communicate via GPIO is large. The Python language is also a favorite in Raspberry circles. However, Java is still strongly represented in the professional environment, a language that is not necessarily the first choice when it comes to MSR. But it works: With JNI (Java Native Interface) a powerful method for communication and interaction via GPIO is available. Setting up a JNI toolchain is not easy, but it is feasible. The following article will help you get started: Using the example of a Raspberry Pi, it will facilitate the first steps into the world of JNI.
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