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Light sensor

Twilight sensor functioning

A twilight sensor or switch can be of the electrical or electromechanical type. The operation takes place thanks to a small photosensitive panel usually placed on the upper part of the same, which detects the percentage of brightness in the environment in which it has been placed and based on it activates or deactivates the circuit, which in turn powers or switches off a any light source connected to it. The more expensive models have a daily or weekly programmable part in order to program the switching on or off even independently of what is indicated above.In addition, this programming, combined with the photosensitive panel, allows you to avoid, for example, the switching on of a light during the day due to thunderstorms or low light. Surely the strong point of this device is to guarantee energy and economic savings, avoiding waste when energy is not needed. Non-programmable sensors cost around 8-15 euros while programmable ones can also cost under 60 euros, with variable programming from 4/6/8 and 12 hours.

Twilight sensor for outdoor use


On the market, outdoor crepuscular sensors of different shapes and sizes are manufactured and sold. There are those powered by 220 volts or those with 12 volt batteries. In the former, the installation involves bringing the electricity grid to the point where we want to mount it. For example, in a garden to create an illuminated walkway or illuminate plants and flowers, just power the twilight sensor with the electricity network and then with the 12 volt output from the same, you can access / turn off the various external bulbs in all safety to the low voltage. In the seconds, on the other hand, there is no need for the electricity network, but powering the lights takes place precisely from the batteries it contains.

Rechargeable twilight sensor


In addition to those with power supply or 12 volt batteries, there are also models of solar-powered rechargeable twilight sensor on the market. These models are mounted on beautifully crafted LED lamps ready to be placed for example in the garden and give a beautiful effect both visual and pleasant to see. In practice, through a small photovoltaic solar panel, in the morning the sunlight charges a small battery pack, so the twilight during the night is activated and feeds the circuit to turn on the power LED lamp that are usually used in these lamps. for the low consumption they have. In fact, the power supply voltage of these LEDs is very low between 0.9 times and 1.9 volts, so a 1, rechargeable battery is enough.

Proportional twilight sensor


On the market there are so-called proportional twilight sensors capable of gradually increasing the brightness of an incandescent bulb or any light source in an inversely proportional manner to the percentage of brightness received by the sensor itself. This is usually used with the aim of maintaining a constant brightness on a certain point that you want to illuminate. The operating principle is substantially the same as that of a normal twilight sensor, except that the output signal from the comparator is amplified and used to control a dimmer, i.e. an electronic regulator used to control the power absorbed by a load. The cost of this device can be around 25/30 euros.

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