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Photoresistor LDR 10K
Photoresistor LDR 10K
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Item no: F23106706

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Grove - Light sensor (v1.2), LS06-S, compatible with Arduino
Grove - Light sensor (v1.2), LS06-S, compatible...
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Item no: F23109296

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Light intensity sensor with photoresistor - JST XH2.54 3P socket
Light intensity sensor with photoresistor - JST...
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Item no: F23106310

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Grayscale sensor, color sensor on a breakout board
Grayscale sensor, color sensor on a breakout board
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Item no: F23106531

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TEMT6000 - analog light intensity sensor with XH2.54 connector
TEMT6000 - analog light intensity sensor with...
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Item no: F23108989

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Photoelectric switch, light barrier - ITR20403
Photoelectric switch, light barrier - ITR20403
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Item no: F23109086

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GY-31 TCS3200 Color sensor
GY-31 TCS3200 Color sensor
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Item no: F23107380

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GY-33 TCS34725 Color Sensor Module (Replaces TCS230 TCS3200)
GY-33 TCS34725 Color Sensor Module (Replaces...
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Item no: F23106473

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Wemos D1 mini Pro - 15 in 1 Sensor Kit
Wemos D1 mini Pro - 15 in 1 Sensor Kit
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Item no: F23108668

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Light sensor with LED technology for Arduino - digital and analogue
Light sensor with LED technology for Arduino -...
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Item no: F23107040

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UV Sensor - Budget - For Arduino
UV Sensor - Budget - For Arduino
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Item no: F23106492

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Light sensor BH1750, BH1750FVI chip Light intensity sensor
Light sensor BH1750, BH1750FVI chip Light...
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Item no: F23107581

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Color sensors: Detecting colors

With a color sensor for microcontrollers, you can determine colors relatively easily using the RGB color spectrum, emitting light via the white LEDs located on the board. In the center of the usually four LEDs is a photodiode. This filters the reflected light optically and divides it into red (R), yellow (G) and blue (B) light components and measures the intensity (i.e. the ratio) of the individual color components. By measuring the intensity of the color components, the color of the object is accurately determined.

Photoresistor: Determine brightness with an Arduino microcontroller

The function of photoresistors is very similar to that of color sensors. However, unlike color sensors, with photoresistors we measure the intensity of ambient light. It is not possible to determine the exact color.

Functionality of photoresistors

With increasing light irradiation, the resistance drops. This effect is also called photoelectric effect. When the conductivity of the resistor increases, the measured value at the analog input of the microcontroller increases. When the light intensity decreases, the measured value decreases again and the resistance increases. 

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