Digital light intensity light sensor BH1750FVI module GY-30

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Digital light intensity detection module: GY-30

 

Use Rohm original BH1750FVI chip

Power supply : 3-5V

Light degree range: 0-65535 lx

Sensor built -in 16BITAD converter

Direct digital output, omitting complex calculations, omitting calibration

Not distinguishing environmental light sources

Close to the visual sensitivity of the lighting characteristics

You can measure the high precision of 1 Lax

 

 

Standard NXP IIC communication protocol

 

Inside the module contains communication level conversion, directly connected to 5V single -chip machine IO

Provide STC 51  C language test code

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Large price

 

Related knowledge

background

1967FranceThirteenInternational Measurement ConferenceStipulate Khandella, Kandla/square meter, lingering, Lax as a luminous intensity,brightnessUnits of optical flux and light degree are of great significance for optical measurement units used in unified engineering technology.In order to make you understand and use convenient, the following will be briefly introduced:

1. Definition of Candela

1. Definition of Candlelight, International Candlelight, Candela)

101325 per square meterNewtonThe standard atmosphere is pressed, and the area is equivalent to 1/60 square centimeter absolute“ black body&Rdquo; (that is, an ideal object that can absorb all foreign light without reflection), when the solidifying temperature (about 2042K obtains 1769 ° C) in pure platinum (PT), the light emitting intensity along the vertical direction is 1 Kandera.In addition, there are three concepts of candlelight, international candlelight, and Kandla, which should not be equivalent.In terms of quantity, 60 Candra is equal to 58.8 international candlelight, and the 1 candlelight of Hoffner Lantern is equal to 0.885 international candlelight or 0.919 Candra.

2. Lighting intensity and brightness

The light emitting intensity is referred to as light, and the international unit is CANDELA (Kandera) abbreviation CD.LCD refers to the flux of light from the three -dimensional corner of the unit in the specified direction.When the light source radiation is uniform, the light strong is i = f/&Osga ;,Ω the three -dimensional angle, the unit is the spherical degree (SR), F is the optical flux, the unit is the lumen, and the light source is from i = f/4.The brightness of the light indicates the brightness of the light, refers to the ratio of the light of the light in the specified direction to the area of ​​the lighting surface of the glowing surface in the specified direction.For a scattered scattering surface, although the light strength and light flux in all directions are different, the brightness of each direction is equal.The fluorescent screen of the TV is similar to such a scattered face, so watching images in all directions has the same brightness.

Here are the brightness values of some light sources: unit CD/M⊃2;

Sun: 1.5*10; Sunlight: (5— 10)*10⊃3; Moonlight (full moon): 2.5*10⊃3; Black and white TV fluorescent screen: about 120; color TV fluorescent screen: about 80.

3. Light flux and lumens

Emitted by light sourcesLight energyIt is radiated in all directions. For the light energy of a certain area in the unit time, it is called through this area.Radiation energyPlum volume.The frequency of all color light is different, and the sensitivity to the light of the eyes is different. Even if the radiation energy of the various color light is equal,VisionOn -the -wayThe same brightness cannot be produced. In all colors, yellow and green light can arouse the greatest bright feeling.If green light is used as a standard, it makes its optical flux equal to the radiation energy flux, which is smaller than the green light of the bright light, and the light flux is less than the radiation energy flux than the green light.The units of the optical flux are lumen, the transliteration of the English Lumen, as abbreviated as LM.Absolutely black body at 5.305*10 under the solidification temperature of platinum⊃3;cm&The luminous flux radiated over the area is 1lm.To indicate the relationship between light intensity and luminous flux, the luminous flux emitted by a point light source with a luminous intensity of 1 candela within a unit stereo angle (1 spherical degree) is 1 lumen.The output of a 40W fluorescent lamp is approximately 2100 lumens.

4. Lightness and Lx

The lighting degree can be measured directly.The unit of light is Lax, the transliteration of the English LUX, which can also be written as LX.Objects that are uniformly irradiated by light, the light flux obtained on the area of 1 square meter is 1 Lax.Sometimes in order to make full use of the light source, a reflection device is often added to the light source, so that some directions can get more light flux to increase the illuminance of this face.Such as car headlights, flashlights, photography lights, etc.

The following is a variety of environmental values: unit LUX

Night: 0.001— 0.02; Moon Night: 0.02— 0.3; cloudy indoor: 5— 50; overcast outdoor: 50— 500; sunny room: 100— 1000; the illuminance in the sun at noon in summer: about 10*6 squares;— 60; Home Camera Standard Photo: 1400

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