The light turns on automatically. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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The apartment rang. And so, in the darkness of the hallway, you grope for the light switch and only then open the door. You do the same thing when you enter a house. Is it possible to turn on the lighting automatically, say, at the same time as a call or when opening the front door? It turns out that it is possible by installing a simple electrical device in the hallway.
If you press the bell button (Fig. 1) at the front door, relay K1 will immediately work, which, with its contact system K1.1, will close the electrical circuit of the H1 lamp located in the hallway. Moreover, a diode VI can be connected in series in the circuit to obtain incomplete (“standby”) lighting.
Fig. 1
As soon as the bell button is released, capacitor C1 gradually discharges through the winding of relay K1, delaying its reverse action for up to 30 seconds. This time is usually enough to get to the light switch S2 installed in the hallway.
The second device (Fig. 2) allows, in addition, to turn on the lighting when you open the door when you return home. Limit switch S3 is built into the door frame. When it is open, relay K1 is activated and capacitor C1 is charged. If you intend to linger in the hallway, press the light switch. Otherwise, after 30 seconds after you close the door, the light in the hallway will go out.
Fig. 2
The third device uses a dual switch S2, which allows you to switch the lamp from normal mode to "standby". Switch S2 is installed indoors. If it is closed, when the door is opened, the "end" S4 will trigger the relay K1, which, with its contact system K1.1, blocks S4 and at the same time turns on the B1 bell, warning that the door is open.
Fig. 3
In all devices, the REH18 relay (passport PX.564.510P) is used, C1 - capacitors K50-18 connected in parallel, limit switch - BK-1.
The elements of each device are placed together with the bell in a plastic case measuring 230x190x80 mm, installed in the hallway above the entrance door.
Author: A. Shvartsman, Vinnitsa
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