Bukkit

Pre-alpha release for brave souls.

craft detectors like plus-signs with a watch at the center + x4 the detection item, shape:
_A_
ABA
_A_

iron detector crafted from iron ore
gold detector crafted from gold ore
diamond detector crafted from diamonds
lapis detector crafted from lapis
emerald detector crafted from emerald

range is currently hard coded to an 8 block radius (sphere-shape)

a player can only have 1 detector active at a time!

toggle the detector by holding it and right-clicking (on a non-interactive block, i.e. right clicking a door or workbench wont toggle the detector)

once activated, the detector must remain in the players item hotbar to remain active (you can move it around, but if you move it away from your item hotbar it will deactivate on the next "blip")

there are no commands / permissions!

There are a lot of possible situations where the detector will still display itself as "[ON]" despite being deactivated. This doesn't affect gameplay.
(I'm not tracking all the events needed for this because small visual glitches like this is very low priority in a pre-alpha: the plugin can "loose track of" the detector item --> it will deactivate the detection mechanic, but the actual item wont have it's lore-text updated.)