Example software for interfacing Minecraft with the real world.
Uses the Minecraft Pi Edition Python API. Load up a world and run build TNT. Press input 0 on PiFace Digital to activate TNT, destroy the TNT in-game to turn on Relay 0 (which is connected to real TNT!).
Place and run build_tnt.py in the mcpi/api/python/ directory.
Example video: http://youtu.be/n_3vt6RORb0