20 pieces of 5518 Light Dependent Resistors LDRs 5 mm Photoresistor Photoconductive resistance Product overview This listing includes 20 pieces of the 5518 light dependent resistor LDRs. Each unit is a 5 mm photoresistor with photoconductive resistance. The device is a simple, passive component that changes its resistance in response to ambient light. It is designed for easy inclusion in through hole circuits and is suitable for a wide range of light sensing applications. Key benefits Simple light sensing solution The LDR provides a direct and reliable way to detect ambient light without complex circuitry. Passive and power efficient No active circuitry is required to sense light, making it ideal for low power designs when used in a voltage divider. Compact 5 mm size The 5 mm disk form factor fits easily into compact projects and standard through hole layouts. Inexpensive and versatile A cost effective component suitable for hobby electronics, education, and professional prototypes. Easy to integrate Two lead through hole design allows straightforward insertion into PCBs or breadboard experiments. Key attributes Model: 5518 Type: Light dependent resistor LDR Size: 5 mm disk Function: Photoconductive resistance that varies with light intensity Configuration: Through hole, two leads Quantity: 20 pieces per package Typical use and integration notes Light sensing circuits Use the LDR in a resistive divider with a fixed resistor and feed the output to an analog input of a microcontroller or measurement circuit to monitor ambient light levels. Automatic lighting control Pair the LDR with a comparator or microcontroller to trigger lighting or shading based on ambient brightness. Environmental monitoring and exposure sensing Incorporate into devices that need to respond to changing light conditions such as cameras, display brightness control, or outdoor electronic enclosures. Two to three use cases Arduino or microcontroller projects Detect ambient light variation to adjust display brightness or trigger events in a DIY sensor project. Automatic daylight responsive systems Use in garden or outdoor lighting to switch lights on or off in response to dusk and dawn without complex sensors. Ambient light monitoring for electronics Integrate into enclosures or devices to log light levels or provide feedback for environmental sensing applications. Compatibility and handling Through hole mounting Designed for standard through hole PCB assembly and breadboard experiments. Electrical considerations The LDR is a variable resistance device. It should be used as part of a resistive divider or similar circuit to produce a measurable signal. Handling Handle with care to avoid mechanical stress on the leads. The 5 mm disk is robust for typical prototype and light industrial use. Quality and sourcing notes The product consists of 20 pieces of the 5518 LDR in a single package. Each unit provides consistent photoconductive behavior suitable for educational, hobbyist, and development applications. This description reflects the product as described by the title: 20PCS x 5518 Light Dependent Resistor LDR 5MM Photoresistor Photoconductive resistance.