Bicycle leg rigging/animation

Hi All,
I’m trying to achieve this:
[video]https://www.facebook.com/100012610771649/videos/405370389893317/[/video]
Working in Illustrator and Photoshop gets tedious when making changes.
I can’t figure out how this was accomplished:
https://blender.stackexchange.com/questions/28120/creating-a-simple-bicycle-pedal-motion
I’ve tried everything I can think of but all I get is the crank arm moving along the path and not actually rotating.

Your facebook links are dead :frowning: