Ir transmitter to send hex signals at certain times

Using Arduino Project Guidance
2

You have to track two events:

  • what to do next
  • when to do it
    For the "what" a state machine may be a good solution. Then determine the interval after which the next step shall be taken, and wait for that time - see BlinkWithoutDelay.

For the IR part you need the IRremote library, I think that you found it already.