A walking four legged robot "mammal style." 3DOF legs, IR receiver all connected to a Pro Mini. Material cost less than $100.
Project tutorial by StaffanEk
Wow! This is a really good example of hard work and a step-wise evolution of the design. And without loosing sight of the original goal. I did something quite similar but much simpler myself so I really can imagine the efforts behind this Robot Cat.
I am feeling very humble when I add a link to my own "pet":
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