Light dependent relays 

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Light dependent relays - twilight switches and detectors

Twilight switch also known as a twilight switch - this is a type of electrical switch that is designed to switch on and off another device depending on the intensity of light. Twilight switches are usually used to turn on lighting after dark.
The twilight switch is equipped with a special photoresistor that analyzes the light intensity level. The decrease in illumination intensity causes an increase in the resistance in the photoresistor, as a result of which the dusk sensor activates the flip-flop, which causes the supply of electricity to the electric circuit in which the twilight switch is connected.
The appearance of morning sun rays forces the twilight switch to work in reverse. The increased level of illuminance causes a decrease in the resistance in the photoresistor, which in turn turns off the flip-flop and cuts off the power supply, turning off the lighting.
The most common use of a twilight switch (twilight automaton) is to control the lighting of advertisements, neon lights, lighting of shop windows, gardens, driveways in properties.
The general division of twilight automatons (twilight switches) results from the location of the sensor (probe). There are twilight switches with an external probe - on a cable or with a sensor built inside the twilight switch itself.

Twilight switches with internal probe:
AZH, AZH-106, AZH-C, AWZ, AWZ-30

Twilight switches with external probe:
AZH-S, AZ-B, AZ-B-UNI, AZ-112

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    What is worth knowing about twilight automata (sensors)?

    Twilight switches are also called twilight switches/switches or - colloquially - twilight switches. The term twilight sensor is also often used. All these names refer to a device that turns other receivers on and off according to the intensity of natural light. The condition for their proper operation is constant access to daylight. Dusk sensors are most often used to switch on the lighting after dark.

    The principle of operation of twilight sensors

    Twilight switch is equipped with a photoresistor. The photoresistor analyzes the level of daylight intensity. A decrease in its intensity causes an increase in the resistance in the photoresistor. The relay is activated. The relay supplies electricity to the receiver connected to the twilight switch. The lighting is turned on.
    The arrival of the morning sun forces the twilight switch to work in reverse. An increased level of natural light intensity causes a decrease in the resistance in the photoresistor. The relay is deactivated and, as a result, the lighting is switched off.

    Application of twilight sensors

    The most common use of twilight automatons is:

    • control of highlighted ads,
    • lighting of shop windows,
    • turning on lights in gardens and parks after dusk,
    • illuminating driveways and paths.