TriggersAdded in 1.11
OBSERVER
Detects block state changes in front of its face and emits a 1-tick pulse from its back. Detects placement, removal, growth, state changes, and more.
Crafting Recipe
6 Cobblestone + 2 Redstone Dust + 1 Nether Quartz → 1 Observer
Signal Behavior
Input
Block state change in front of face
Output
1-tick pulse (signal 15) from back
Max Signal Strength
15
Delay
2 game ticks (1 redstone tick) pulse
Modes
- Pulse on block update detection
Common Uses
- ▸Block update detection
- ▸Crop growth detection
- ▸Sugarcane/bamboo farms
- ▸BUD switches
- ▸Flying machines
Common Mistakes
- !Only detects block in front of face, not adjacent
- !Emits from back, not the detecting face
- !1-tick pulse is very short, may need extension