1Channel Photoresistor Sensor Module with Adjustable Sensitivity and 4Wire Interface Overview This compact photoresistor sensor module detects changes in ambient light and provides both analog and digital outputs for flexible use in electronics and prototyping. It features an adjustable sensitivity control for precise threshold setting and a simple 4wire connection for quick integration. Key benefits Precise light detection: Built around a photoresistor element, the module measures ambient light and converts it to an analog voltage for accurate monitoring. Simple threshold switching: A builtin comparator provides a digital output that changes state when light intensity crosses the useradjusted threshold, enabling automatic switching and event triggering. Easy integration: The 4wire interface allows straightforward wiring to microcontrollers and development boards. Use the analog output for proportional readings or the digital output for on off control. Adjustable sensitivity: The onboard potentiometer lets you finetune response to match different lighting conditions and applications without circuit changes. Compact and lowprofile: Small PCB size and lightweight construction make it suitable for tight spaces and portable projects. Main attributes Function: Light detection using a photoresistor; provides analog and digital outputs. Interface: Four wires for power and signals. Typical connections are VCC, GND, AO (analog out), DO (digital out). Controls: Onboard sensitivity adjustment via potentiometer to set the digital switching threshold. Materials: Standard PCB with photoresistor sensing element and precision potentiometer for stable adjustments. Performance: Fast response to changes in light intensity; analog output proportional to light level for monitoring; digital output for immediate switching when threshold is reached. Compatibility: Works with common microcontrollers and development boards such as Arduino and Raspberry Pi, and with other controllers that accept analog and digital sensor inputs. How it solves common problems Replaces complex lightsensing circuits with a single module that provides both analog measurement and threshold switching. Lets you tune sensitivity on the fly for different lighting conditions without modifying code or hardware. Reduces setup time and wiring complexity in prototypes and finished products by providing a readymade sensor that plugs into standard inputs. Typical applications Automatic lighting controls: Use the digital output to switch lamps or relays when ambient light falls below a set level, for dusk to dawn lighting or display backlight control. Environmental monitoring: Feed the analog output to a microcontroller to log ambient light for plant growth monitoring, display dimming, or power management. Prototyping and education: Ideal for classroom projects, hobby electronics, and proof of concept designs where quick, reliable light sensing is required. Basic hookup guidance Wire the module to your controller using the four wires: connect VCC to the module power, GND to ground, AO to an analog input for light level readings, and DO to a digital input for threshold events. Adjust the potentiometer until the digital output switches at the desired light level; read AO to obtain continuous light intensity values. What to expect A reliable, lowcost lightsensing module that offers both continuous analog measurement and a configurable digital switch. Suitable for a wide range of hobbyist and prototyping projects where compact size, simple wiring, and adjustable sensitivity are important.