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You need some kind of interface chip to do this. FTDI make suitable chips with easy to use drivers and sell several little boards so you don't need to build anything. You can also do the same thing with several development boards and with Arduino as well. If you are a total beginner the Arduino is probably the easiest way to start.
As a much smaller alternative to the Arduino you might also want to look at the Teensy (just google it).
hi i want to know how can i send some signal like or similar through my USB data ports to a output device.Like i want to use my pc to control some thing trough USB and seance USB do not have many io pins so i want to use a multiplexer to multiplex the data to control some device.So how can i do that?And what Programming langues will i need C or Assemble My pc configuration is Core i3 6100 MSI H110m Pro-VH and win10 and i think you need to know ram or etc