How to make the simplest software-controlled ON/OFF hardware with Java? [closed]

Question

Closed. This question needs to be more focused. It is not currently accepting answers.

---

Want to improve this question? Update the question so it focuses on one problem only by editing this post.

Closed 8 years ago.

Improve this question

I want to make the simplest and most reliable on/off device controlled from a compuer software (Java).

I was thinking about sinus sound singnal + RC filter with relay for specific frequency, but unfortunatelly I can't use sound card - it is already occupied for different purposes.

How can I achieve this without much compatibility/reliability issues. It should work both on Unix and Windows

I mean an output device, so I want to turn on/off relay from Java software.

Answer 1

USB MIDI adapter and then midi to relay .

Answer 2

Maybe use a Raspberry Pi (includes GPIO controller). Put a web service to control the GPIO. The web service is accesable from any HTTP client.

http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/