The door controls the light. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The door controls the light. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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Devices for automatically turning on / off the light in the bathroom (toilet) room are designed to seamlessly resolve the following everyday situations:

1. There is no one in the room they serve, the door is closed or locked from the outside, the light is off.

2. There is still no one in the bathroom (toilet). However, the door is open and the lights are on. This situation arises when they intend to take something in the bathroom (toilet): for example, a rag or a bucket, or to clean it.

3. There is a person inside behind the locked door and the light in this room must be turned on (the EL1 lamp is on).

Schematic diagram of an automat for controlling the lighting of a bath or toilet room, features of its installation and the possibility of using a latch instead of a microswitch SB1 (click to enlarge): 1 - wall; 2 - door frame; 3 - pressure bracket; 4 - L-shaped bracket; 5 - microswitch MP7 or MP2101 (2 pcs.); 6 - relay block; 7 - latch; 8 - locking plate; 9 - Z-shaped bracket; material parts pos. 3, 4, 9 - steel 1,5 mm sheet

Based on the emerging specific situation - and the corresponding sequence of actions of the lighting control machine. In particular, the situation indicated above under paragraph 2 logically determines for the scheme I propose (Fig. a) a simple, clear algorithm, when the device (for many it is the most common latch), locking the door, presses the switch button SB1 with the end of its latch (Fig. b), thus providing a break in the coil circuit of relay K1.

And what about the "limit switch" SB2? The contact pair 1 - 3 turns out to be open, since the pressure bracket attached to the door (which in this case is open) is removed from the button head. As a result, the relay is de-energized and the lamp is not turned on.

When the latch is moved to the other side to close the door from the inside, the pressure on the "espagnolette" button disappears. Under the action of a straightening internal spring, the contact pair 1 - 2 at SB1 closes, causing relay K1 to operate. Lamp EL1 turns on and stays on until the door is opened again. But there already - the prerogative of the "limit switch" SB2. Like the "espagnolette" SB1, this is a microswitch of the MP7 or MP2101 type. However, SB2 is not located on the door itself, but on an angle bracket fixed in the upper jamb of the door block, in order to turn on the light when paired with a push bracket when the bathroom (toilet) room is open.

Both homemade parts, which ensure proper fastening and reliable operation of the SB1 "limit switch", are made of 1,5 mm steel sheet. The push tab is bent at an angle of 45° so as not to inadvertently damage the button head when closing the door.

Protruding 55 mm above the plane of the door, the bracket ensures that the head of the “limit switch” SB1 is held pressed, and in combination with the position of the microswitch itself, it also creates a kind of “dead zone” of the machine to a situation where the door, due to someone’s negligence, remains not completely closed .

It is also worth noting that with the introduction of a step-down transformer into this device, it is permissible to abandon the microswitch located near the latch. It is understandable: in the absence of dangerous voltages, the latch itself can serve as a switch (Fig. c). It is this machine that has been working properly for the author for more than a quarter of a century.

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