LDR 20mm 8-20K ohm - 20528
LDR 20mm 8-20KΩ (GL20528) Light Dependent Resistor is a highly sensitive photoresistor designed to detect changes in ambient light intensity. Its resistance varies according to the amount of light falling on the sensor, decreasing as illumination increases and increasing in darker conditions. With a 20mm sensing surface, 560nm peak spectral response, and simple two-pin interface, it is ideal for automatic lighting systems, light meters, security devices, and microcontroller-based projects. The sensor provides an easy and cost-effective solution for measuring light levels and implementing intelligent light-responsive electronic systems.
حساس الضوء LDR 20mm 8-20KΩ (GL20528) هو مقاومة ضوئية حساسة للضوء مصممة لاكتشاف التغيرات في شدة الإضاءة المحيطة. تتغير قيمة المقاومة حسب كمية الضوء الساقط عليها، حيث تنخفض المقاومة مع زيادة الإضاءة وترتفع في الظلام. يتميز بسطح استشعار كبير بقطر 20 مم واستجابة طيفية عند 560 نانومتر مع واجهة بسيطة مكونة من طرفين فقط. يُستخدم على نطاق واسع في أنظمة الإضاءة التلقائية، وأجهزة قياس الضوء، وأنظمة الأمان، ومشاريع الأردوينو والإلكترونيات الذكية التي تعتمد على استشعار شدة الإضاءة.
The GL20528 LDR 20mm Light Dependent Resistor is a cadmium sulfide (CdS) photoresistor designed to detect and respond to changes in ambient light levels. Its resistance changes automatically according to the intensity of incident light, making it an effective and economical solution for light-sensing applications.
The sensor features a large 20mm photosensitive surface and a spectral peak response of 560nm, closely matching the visible light spectrum. As illumination increases, the resistance decreases, allowing the device to be used in analog and digital light-control circuits.
The GL20528 is commonly used in automatic lighting systems, streetlight controllers, security devices, industrial automation, exposure control systems, and educational electronics projects. Its simple two-terminal design enables easy integration with Arduino, ESP32, Raspberry Pi ADC modules, and other microcontroller platforms.
Specifications
| Specification | Details |
|---|---|
| Product Name | GL20528 Light Dependent Resistor |
| Sensor Type | Light Dependent Resistor (LDR) |
| Diameter | 20 mm |
| Resistance Range | 8KΩ – 20KΩ |
| Spectral Peak Response | 560 nm |
| Number of Pins | 2 |
| Dark Resistance | Up to 2MΩ |
| Light Resistance | 10KΩ – 20KΩ |
| Maximum Operating Voltage | 500V DC |
| Maximum Power Dissipation | 0.5W |
| Response Time | 30μs |
| Material | Cadmium Sulfide (CdS) |
| Output Type | Variable Resistance |
Applications
Analog Applications
- Camera exposure control
- Automatic slide focus systems
- Photocopy machine toner density control
- Colorimetric test equipment
- Densitometers
- Electronic weighing scales
- Automatic gain control systems
- Automatic rear-view mirror dimming
Digital Applications
- Automatic headlight dimmers
- Nightlight control systems
- Streetlight automation
- Beam-break object detection
- Position sensing
- Presence and absence detection
- Oil burner flame monitoring
General Applications
- Arduino and ESP32 projects
- Light-controlled switches
- Industrial automation
- Photoelectric control systems
- Security and burglar alarms
- Smoke detection systems
- Electronic toys
- Ambient light measurement
- Smart lighting systems
- Energy-saving control circuits