ALLNET 4duino Photoresistor (4duino_B30) - Light-Dependent Resistor for Arduino, Raspberry Pi, ESP32

The ALLNET 4duino Photoresistor (4duino_B30) is a high-quality light-dependent resistor (LDR) designed for use with Arduino, Raspberry Pi, ESP32, ESP8266, and other microcontroller platforms. It detects ambient light levels by changing its resistance, making it ideal for light sensing, automatic lighting control, and brightness adjustment projects.

Advantages

This photoresistor offers high sensitivity to visible light, a wide operating temperature range, and fast response times. Its through-hole package and epoxy coating ensure easy integration and durability. Compatible with all major microcontroller boards, it simplifies adding light detection to your electronics projects.

Suitable for

• Light detection and automatic lighting systems
• Street light control and brightness adjustment
• Arduino, Raspberry Pi, ESP32/ESP8266 projects
• Educational electronics and DIY sensor kits

Key specifications

• Sensor Type: Photoresistor (Light Dependent Resistor - LDR)
• Technology: Cadmium Sulfide (CdS)
• Resistance in Dark (0 Lux): >1 MΩ
• Resistance at 10 Lux: 10-20 kΩ (typical)
• Resistance at 100 Lux: 1-2 kΩ (typical)
• Spectral Peak: 540 nm (Visible Light Spectrum)
• Maximum Voltage: 150 VDC
• Maximum Power Dissipation: 100 mW
• Operating Temperature Range: -30°C to +70°C
• Response Time (Rise): 20-30 ms
• Response Time (Fall): 20-30 ms
• Pin Count: 2
• Package Type: Through-hole, Epoxy Coated
• Output Type: Analog Resistance

Recommendations

For best results, use with a fixed resistor (e.g., 10 kΩ) to form a voltage divider circuit. Connect the analog output to your microcontroller's ADC pin for accurate light level readings. This sensor is a cost-effective solution for adding ambient light sensing to your projects.