I spent the past few weeks going over a few iterations of a Minecraft Creeper robot. Emphasis on making the build as simple as possible while providing a fairly accurate rendition of the Creeper Skin. A LEGO EV3 Mindstorm using two large motors and tracks allows the Creeper basic movement. A medium sized motor attached within the body going into the head provides the ability for the head to have infinite rotation, definitely adding to the creeper feel : ) By default the robot walks a ~3' perimeter (forward, rotate left x4). A light sensor allows the creeper to 'wake up' only when the ambient light drops below a certain threshold, and an ultrasonic sensor changes its default perimeter walk by having it charge towards anything that comes within ~2 feet of it. The design was created to make it possible for anyone comfortable using a utility knife, glue, and LEGOs to construct. I've had a couple test runs with a group as young as 10 build one. So far it seems doable. I would love to build another one using cheaper parts. As much as I love LEGO, the startup cost of an EV3 kit can be quite the inhibitor.
Navigates a default path using treads, charges upon anything coming within 2ft in front of it, plays audio.
This is a companion discussion topic for the original entry at https://community.robotshop.com/robots/show/lego-ev3-minecraft-creeper