title: USB HID Keyboard emulator
body: <p>I want to make hardware keylogger from my Raspberry Pi model B. I think that I can connect keyboard to raspberry and connect raspberry to computer, but how I can emulate keyboard output?</p>
  
  <p>I consider that here must be some low-level libraries for this purpose, but I can't find someone. </p>
  
  <p>Thanks!</p>