Photo Resistor Sensor LDR 10mm

Photo Resistor Sensor LDR 10mm is a high-quality electronic component designed for Arduino, prototyping, and educational electronics.

These small 10mm LDR (Light Dependent Resistor) are also called a photoresistor.  An LDR is a resistor whose resistance changes with the amount of light striking it.
Key Features of Light Depentent Resistor:
As the strength of the light falling on the LDR increases, the resistance of the LDR gets lower.

It is typical to put the LDR in series with a resistor to create a voltage divider and feed that output to an analog input on an MCU.  The output will be a lower voltage when no light is striking the sensor and the voltage will increase as the light intensity increases.

These can be used in a variety of applications such as monitoring a pilot light, night light control or anywhere that you want to detect a basic threshold of light and take some action.

LDR Resistance Value
Light Intensity

20K
Sensor blocked

17K
Very dim room

3K
Moderate room light

950
Overcast daylight

400
Next to fluorescent bulb

Size: 10mmx 2 (D x No. of Pins)
Technical Specifications

Operating Ratings
Max Voltage
250V

Max Power Dissipation
200mW

Peak Detection Wavelength
540nm (similar to human eye)

Dimensions
Sensor Diameter
10mm

It’s perfect for DIY makers, students, and anyone building custom electronic circuits or STEM kits.