{"product_id":"ldr-sensor-module-photosensitive-light-detection-sensor-module","title":"LDR Sensor Module - Photosensitive Light Detection Sensor Module","description":"\u003ch1\u003eLDR Sensor Module - Photosensitive Light Detection Sensor Module\u003c\/h1\u003e\n\u003cp\u003eThis LDR (Light Dependent Resistor) sensor module detects ambient light intensity and provides both analog and digital outputs. It uses a photoresistor as the sensing element and an LM393 comparator to generate a clean digital signal based on a user-adjustable threshold. The module is ideal for building light-sensitive switches, automatic lighting systems, and IoT light monitoring projects.\u003c\/p\u003e\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3V to 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eAnalog (0-5V) and Digital (TTL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity Adjustment\u003c\/td\u003e\n\u003ctd\u003eOnboard potentiometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComparator IC\u003c\/td\u003e\n\u003ctd\u003eLM393\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePCB Size\u003c\/td\u003e\n\u003ctd\u003eApprox. 32mm x 14mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kit-automatic-night-lamp\"\u003eAutomatic night lamp that turns on in darkness\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eLight intensity meter for classroom or lab experiments\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kit-arduino-laser-tripwire-alarm-kit\"\u003eLaser tripwire alarm system\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eLight-following robot or panel tracker\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis module works with any microcontroller that supports analog or digital inputs, including Arduino Uno, Nano, and Mega, ESP32, ESP8266, and Raspberry Pi. It operates at 3.3V to 5V, so no level shifting is required for most boards. Commonly paired with relay modules for switching AC loads.\u003c\/p\u003e\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 5V (or 3.3V), GND to ground, AO to an analog pin for continuous light readings, and DO to a digital pin for threshold detection. The onboard red LED lights when the digital output goes low (light exceeds threshold). Adjust the blue potentiometer to set the trip point.\u003c\/p\u003e\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, simply connect VCC to 5V, GND to GND, AO to A0, and DO to D2. It requires no special libraries.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I adjust the sensitivity?\u003c\/summary\u003e\u003cp\u003eUse a small screwdriver to turn the onboard potentiometer. Rotating clockwise increases the light level required to trigger the digital output; counterclockwise decreases it.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use both analog and digital outputs at the same time?\u003c\/summary\u003e\u003cp\u003eYes, the module provides simultaneous analog and digital outputs, so you can read light intensity while also monitoring a threshold event.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53444959633773,"sku":"CDN-0354","price":30.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_119767ec-b828-4160-aa91-43859c5ee1d6.jpg?v=1781512490","url":"https:\/\/compoden.com\/products\/ldr-sensor-module-photosensitive-light-detection-sensor-module","provider":"Compoden","version":"1.0","type":"link"}