5PCS Photosensitive Sensor Module 4Pin for Arduino DIY Projects Overview This set includes five compact photosensitive sensor modules that detect ambient light using a photosensitive resistor. Each module provides both analog and digital outputs through a standard 4pin header for straightforward integration with Arduino and other common microcontrollers. Key benefits Ready to use: Standard 4pin interface (VCC, GND, AO, DO) makes wiring and testing quick for prototyping and classroom use. Dual outputs: Analog output reports light intensity for measurement and logging. Digital output is configurable with an onboard potentiometer for thresholdbased switching. Adjustable sensitivity: Builtin potentiometer lets you set the trigger level without changing code, useful for rapidly tuning behavior in different environments. Pack of five: Multiple modules in one allow parallel sensing, experiments, or distributed sensing across a project. Compact and lightweight: Small PCB footprint fits easily into enclosures and breadboards for neat installations. Broad compatibility: Works with 3.3V and 5V microcontroller platforms, including Arduino boards and other development boards. Function and technical highlights Sensing element: Photosensitive resistor (LDR) measures ambient light level; resistance changes with illumination. Outputs: Analog output (AO) for continuous light level readings; digital output (DO) switches when light crosses the adjustable threshold. Interface: 4pin header with standard spacing for easy breadboard or jumper connection. Adjustment: Onboard trim potentiometer to set the switching point for the digital output without code changes. Ideal for prototyping: Simple hardware behavior lets you focus on application logic rather than sensor setup. Practical applications Automatic lighting control: Use the digital output to switch lights or relays when ambient light falls below a set threshold for dusk detection. Data logging and monitoring: Use the analog output with an Arduino analog input to record and graph ambient light levels over time. Robotics and automation: Integrate several modules to provide localized light sensing for line following, edge detection, or environmentaware behaviors. Simple connection example VCC to 3.3V or 5V power GND to system ground AO to analog input for continuous measurement DO to digital input for thresholdtriggered events Adjust the onboard potentiometer while monitoring the analog reading or digital state to set the desired response. What makes it stand out Combination of analog and digital outputs reduces the need for extra hardware when both measurement and event detection are required. Pack of five supports multipoint sensing or classroom and workshop projects without buying individual units. Straightforward, reliable operation with minimal setup, suitable for beginners and experienced makers. Contents 5 photosensitive sensor modules with 4pin headers Each module includes a photosensitive resistor and onboard potentiometer on a compact PCB Compatibility note Designed for use with Arduino and other 3.3V or 5V microcontroller platforms. Standard header spacing works with breadboards and common jumper wires. This module set is intended for electronics projects, prototyping, and learning applications where reliable light detection and easy integration are needed.