Accurate Ambient Light Detection! Photoresistor Light Sensor Module, LM393 Comparator Output, Adjustable Sensitivity, 3.3V-5V – Perfect for Smart Lighting & Automation Projects.

Key Features & Benefits

🔆 High-Sensitivity Photoresistor: Responds quickly to ambient light changes, outputs a digital switch signal based on brightness.

⚡ Wide Voltage, Strong Compatibility: 3.3V–5V operation – connects directly to Arduino, Raspberry Pi, ESP32, and other popular boards.

🎛️ LM393 Comparator Output: Digital output (0/1) with adjustable sensitivity potentiometer for fine‑tuning.

🛡️ Strong Output Drive: TTL switch output can directly drive relay modules or trigger MCU interrupts.

📏 Compact Size, Easy Mounting: Only 32×14mm with mounting holes – perfect for smart car or enclosure installation.

🔌 Plug & Play: 3‑pin interface (VCC, GND, DO) – just connect with jumper wires.

Product Description

Want your project to sense ambient light and automatically turn lights on/off? This photoresistor light sensor module is the answer. It detects ambient brightness using a photoresistor and outputs a digital signal when brightness crosses the set threshold. The built‑in LM393 comparator and sensitivity adjustment let you fine‑tune the trigger point for different lighting conditions. Ideal for smart lighting control, light‑activated switches, light‑following smart cars, and environmental monitoring.

⚡ Quick Start Guide & Important Tips

🔹 What You Get & What You Need
✅ This board does: Detects ambient light brightness, outputs digital switch signal (HIGH/LOW)
❌ This board is NOT: An analog output sensor (no AD value), nor a linear brightness sensor
🔧 You will need: Microcontroller (Arduino/Raspberry Pi/etc.), jumper wires, 3.3V-5V power supply
New to this? Check our Wire Kit – includes female‑to‑female jumper wires

🔹 Wiring in 3 Steps

1.Power: VCC → 3.3V or 5V, GND → GND
2.Signal: DO → microcontroller digital input pin
3.Adjust Sensitivity: Place the sensor under your target lighting condition, turn the potentiometer until the output state changes (LED on/off)
⚠️ Note: When ambient brightness exceeds the set threshold, DO outputs LOW (0); when below threshold, DO outputs HIGH (1). Test by covering or shining light on the sensor.
🔹 Common Questions
❓ Output stuck HIGH or LOW?
Check power supply, then adjust the potentiometer while observing the LED. If still stuck, the ambient light may be too bright or too dark – adjust the potentiometer or change lighting conditions.
❓ Sensitivity adjustment range insufficient?
This module detects relative brightness changes. The potentiometer sets the trigger point. For extremely bright or dark environments, consider other sensor types.
❓ Unstable output?
Ensure a clean power supply, avoid rapid flickering light sources, and try lowering sensitivity with the potentiometer.