Automatic lighting switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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I have tried many schemes of devices for automatically turning off lighting in utility rooms (pantry, bathroom, toilet, etc.), but none of them worked stably with temperature changes in different seasons of the year. Due to the large number of electronic components. these circuits had to be repaired frequently. Over time, I had to develop my own scheme with a minimum number of radio components.
Three devices were manufactured and installed in all utility rooms of the apartment. And during the operation (more than nine years), these devices have never been repaired and there have been no malfunctions.
(click to enlarge)
The proposed device works as follows. A magnet is installed on the door of the room, and a reed contact is attached to the door frame. It is convenient to use a reed switch-magnet kit from a burglar alarm. The magnet, when the door is closed, acts on the reed switch SF1. In this case, the reed switch contacts are closed, and the logic level "1" appears at the output of the trigger DD1, opening the transistor VT1, which in turn opens the thyristor VS1. Lights are turned on in the room.
The HL1 light bulb stays on until the door is closed a second time. Then the effect of the magnet on the reed switch switches the trigger to the second stable state. A logical "1" appears at the output of DD0, the transistor VT1 closes, the thyristor VS1 turns off, and the light goes out.
Author: V. Lazovik, Makeevka; Publication: N. Bolshakov, rf.atnn.ru
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