Can we get some more information?
Like what Arduino board?
Your test code. Please read the forum guidelines to see how to properly post code and some good information on making a good post.
Use the IDE autoformat tool (ctrl-t or Tools, Auto format) before posting code in code tags.
A circuit diagram, Hand drawn, photographed and posted is fine. Include all pin names/numbers, components, their part numbers and/or values and power supplies.
How did you obtain that IR remote code?