Here's a simple video on how to make a drawbridge using sticky pistons in Minecraft
It can be made in 1.4.7 and unless they drastically change something it should always work even in later versions.
It is a two part video
Part 1: Make a 1 wide drawbridge
Part 2: Make the 1 wide drawbridge be 2 wide
Follow me on Twitter: http://www.twitter.com/Aerophite
I'm on Facebook too!: https://www.facebook.com/pages/Aerophite/109858952517740
Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.