Those looking to tinker with humanoid robots aren't exactly lacking for options these days, but Cognitive Spring is taking a slightly different approach than most with its Arduino-based cSpring bipedal robot -- one of the semifinalists in the Insert Coin competition here at Expand.

ENGADGET: Insert Coin semifinalist: cSpring bipedal robot platform hands-on (video)

Check out the full list of Insert Coin: New Challengers semifinalists here -- and don't forget to pick a winner!

ENGADGET