Automatic lighting control. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Automatic lighting control. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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The scheme of the automaton is shown in fig. 1. It is included in the break of the wire marked with a cross connecting the EL1 lamp to the S1 wall switch. The device is controlled by the SF1 reed switch installed on the door frame leading to the room. A permanent magnet is attached to the door itself in such a way that the reed switch contacts are closed if the door is closed and open otherwise.

Automatic lighting control

Suppose the trigger DD1.2 is in a state corresponding to a high voltage level at pin 12. In this case, the transistor VT1 is open, the resistance of the control circuit of the switch DA1 is minimal (which corresponds to a break in its output circuit) and the lamp EL1 does not light. If you change the state of the trigger, the level at its output will become low, the transistor VT1 will be closed and the switch will close the lamp supply circuit. Due to the fact that the control circuit of the DA1 switch is shunted by the capacitor C1, when turned on, the current through the EL1 lamp increases smoothly, which increases its service life.

While the door remains closed, the reed switch SF1 is closed and the voltage across the capacitor C6 is close to zero. With the opening of the door, the charging of the capacitor begins and after a while the voltage on it reaches the trigger threshold DD1.1, as a result of which the low level at its output 2 is replaced by a high one. When the door is closed, the capacitor quickly discharges through the closed reed contacts and the level at the trigger output goes low again. Short-term opening of the reed switch contacts, necessarily preceding their final closing or opening (the so-called "bounce"), does not interfere with the operation of the machine, since the voltage on the capacitor C6 does not have time to change noticeably.

Since the output of the trigger DD1.1 is connected to the counting input of the trigger DD1.2, each opening of the door leads to a change in the state of the trigger DD1.2, and with it the transistor VT1 and the switch DA1. If the light in the room was turned off, it will be on, and when it is on, it will be off. In case of an accidental failure, the normal operation of the machine can be easily restored by opening and closing the door "once" again.

The supply voltage of the DD1 microcircuit is obtained from a rectifier on diodes VD2, VD3. It is stabilized by the Zener diode VD1, and the excess extinguishes the resistor R2. On fig. 2. shows the appearance of the machine, assembled in a plastic case with dimensions of 30x55x18 mm.

Automatic lighting control

Author: S.Gabov, Yekaterinburg

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