This extra large 20mm LDR (Light Dependent Resistor) is also called a photoresistor. An LDR is a resistor whose resistance changes with the amount of light striking it.
Key Features of Light Depentent Resistors:
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, auto chicken coup door opener or anywhere that you want to detect a basic threshold of light and take some action.
Technical Specifications
| Operating Ratings | Max Voltage | 250V |
| Max Power Dissipation | 200mW | |
| Peak Detection Wavelength | 540nm (similar to human eye) | |
| Dimensions | Sensor Diameter | 20mm |
| Lead Diameter | 0.9mm (0.36″) | |
| Lead Length | 14mm (1″) |
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