Check out how to build an IR Remote for Nikon Camera using the Raspberry Pi from Mayank Joneja:
I finally came around to trying out LIRC on the Raspberry Pi to use it to trigger my Nikon D5100. 😀
I haven’t fully utilized the capabilities provided by it yet, but I’ve managed to get it up and running quite easily thanks to a lot of great posts and troubleshooting guides on some blogs and the Raspberry Pi forum.
I mainly followed these links:
To make a very simple remote using the Raspberry Pi, all you have to do is follow the steps given on either of these links.