How to check data of pixel el connected ?

Hi everybody,
I try to use an old pixel led string (8mm, 5Vdc, 3 wires, rgb) in my arduino project.
But I don't find the good IC reference to work it fine. (each try show dirty experience)
Is there any code to show IC data's IC in IDE monitor ?

You are on the french part of the forum.
Either you use french or you ask moderator to move your post to the international part of the forum.