
What you will need...
1.) A flash drive. I would recommend at least a one gigabyte.
2.) Shadow Keylogger (freeware) available for download from cnet.com here
You can see a 6 steps, detailed instructions on instructables on how to create a hardware Key logger using Shadow Keylogger portable.
Steps
1. What you need
2. optional requirement
3. Download and load
4. Make Autorun
5. Advanced options
6. Try it out
Read more here