Logi Escalier ✔

Every time you walk into a stairwell, press a button, and the light greets you—then politely leaves when you are gone—you are witnessing a piece of logical poetry. It is a conversation between you, a timer, and a relay, written in the language of common sense.

What was needed was a logic —a set of rules for the electricity to follow. This was the birth of the . The Core Principle: Temporary Presence The logic is simple, elegant, and almost human: When a person requests light, provide it, but do not waste it. Assume they only need enough time to climb one flight of stairs. logi escalier

The solution was a more advanced : the impulse relay with a "staircase" function . Every time you walk into a stairwell, press

Imagine an apartment building in the 1920s. A resident finishes their shift at the factory and climbs the dark stairs to the fourth floor. At the top, there is a switch. But the entrance? That switch is at the bottom. To turn on the light before ascending, they had to walk into the pitch-black stairwell, feel for the switch, turn it on, run up the stairs, and then… the light stayed on. All night. All morning. Wasting electricity and burning out bulbs. This was the birth of the