Logic Sensor (Day)

This is how a build reacts to the clock without you standing there. It fires when the world flips over to daytime, which is the cue for shutting off lamps, opening shutters, retracting a defensive wall, or resetting a farm at the top of a cycle. You get the one transition, not a signal that stays on all day, so anything that needs both edges wants the Logic Sensor (Night) wired alongside it.

Treat the pulse like any other signal on the line: everything attached toggles, whatever state it was in. That is fine for a lamp bank and awkward for a door that someone may have opened by hand, so wire it to devices whose position you control and not into a chain that can drift out of step by nightfall.

The rest of the family covers other triggers, including liquid contact and the Player Above sensor, which is the multiplayer-friendly replacement for a pressure plate under a doorway.