Description
The Senba GL5549 5mm LDR (Light Dependent Resistor / Photoresistor) is a light-sensitive semiconductor component manufactured by Senba Optical Electronic. It functions as a variable resistor whose resistance decreases as the intensity of incident light increases.
Key Features & Specifications
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Component Type: 5mm Photoresistor / Photo Cell (Epoxy resin encapsulation).
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Dark Resistance: Typically 100k$\Omega$ to 200k$\Omega$ (measured in total darkness after 10 seconds).
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Light Resistance: Ranges significantly lower (typically 10k$\Omega$ to 20k$\Omega$ at 10 Lux illumination, depending on specific lighting conditions).
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Spectral Response: Peak sensitivity around 540 nm, closely matching the human eye’s response to visible light.
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Maximum Ratings:
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Max Voltage: 150V DC/AC (Peak)
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Max Power Dissipation: 100 mW
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Operating Temperature: $-30^\circ\text{C}$ to $+70^\circ\text{C}$
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Common Applications
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Automatic Lighting Controls: Dusk-to-dawn switches, automatic night lights, and street light controllers.
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Optical Sensors & Detectors: Light-seeking robots, line trackers, and optical safety interlocks.
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Microcontroller Projects: Interfacing with analog input pins on development boards (like STM32 or Arduino) through a voltage divider circuit to measure ambient light levels.
Usage Tips
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Voltage Divider Circuit: Because an LDR only changes resistance, you must pair it with a fixed resistor (e.g., a $10\text{k}\Omega$ or $100\text{k}\Omega$ resistor) to form a voltage divider. This allows you to convert the changing resistance into a readable changing voltage for your microcontroller’s ADC pin.
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Handling: Keep the epoxy window clean and free of dust, oils, or fingerprints to ensure accurate and consistent light sensitivity.
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