This is a small set of instructions on how to build a nose poke device for rats, using an arduino, some 3D printed parts (in this case a printrbot LC) and some cheap electronic components.
All the files necessary to reproduce this can be found at: https://github.com/amchagas/poke_device_arduino
Go to the readme.md file for the description.
The description is still not very detailed, but if something is not clear, do not hesitate to make contact! firstname.lastname@example.org