Minecraft: How to build an Automatic Netherportal, Redstone Tutorial

I promised you a litle tutorial on the Netherportal i use in the Acrology upper level. Which bascially ensures you don't get unwanted visitors. It can be activated on Demand and automatically turns off after a few seconds if the chunks are still loaded. Works with one button toggles the netherportal just as long as you need to pass through it.

Associated Let's play episode:
http://youtu.be/OpgsIavo1fE

Worldfile download:
https://www.mediafire.com/?lyzo7g22l4nctet

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