{"product_id":"ldr-light-sensor-module-photoresistor","title":"LDR Light Sensor Module (Photoresistor)","description":"\u003ch5\u003eOverview \u0026amp; Features\u003c\/h5\u003e\n\u003cp\u003eThe \u003cstrong\u003eImported LDR Sensor Module\u003c\/strong\u003e is a highly versatile and easy-to-use light detection board designed for microcontrollers and DIY robotics. Utilizing a high-quality Light Dependent Resistor (Photoresistor), this module measures ambient light intensity and outputs the data in both digital and analog formats.\u003c\/p\u003e\n\n\u003cp\u003eEquipped with an onboard LM393 dual differential comparator, the module provides a clean, reliable Digital Output (DO) that triggers when the ambient light drops below or rises above a specific threshold. This threshold is fully adjustable via the onboard multi-turn potentiometer. Additionally, the Analog Output (AO) provides a real-time, variable voltage reading relative to the exact light intensity, making it an essential input device for Arduino, Raspberry Pi, and smart home automation projects.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e light dependent resistor module, photoresistor sensor board, lm393 light sensor, arduino day night sensor, ldr module imported.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch5\u003eTechnical Specifications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Light Dependent Resistor (LDR \/ Photoresistor)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComparator IC:\u003c\/strong\u003e LM393\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e 3.3V to 5V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Format:\u003c\/strong\u003e Digital (High\/Low logic) and Analog (Variable voltage)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensitivity Adjustment:\u003c\/strong\u003e Onboard Trimpot \/ Potentiometer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicators:\u003c\/strong\u003e Power Status LED and Digital Output Trigger LED\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eCommon Applications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomated Lighting Systems:\u003c\/strong\u003e Triggering relays to turn on street lamps, garden lights, or indoor lighting automatically at dusk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobotics \u0026amp; Sun Tracking:\u003c\/strong\u003e Providing directional light data for solar panel tracking systems or light-seeking mobile robots.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecurity Systems:\u003c\/strong\u003e Functioning as a simple laser-tripwire detector or cabinet-opening alarm in security systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay Brightness Control:\u003c\/strong\u003e Supplying ambient light levels to microcontrollers to auto-dim LCD screens or LED matrices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eFrequently Asked Questions\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between the Analog (AO) and Digital (DO) outputs?\u003c\/strong\u003e\u003cbr\u003e\nA: The Digital Output (DO) acts like a simple switch, giving a logic HIGH or LOW signal (1 or 0) based on whether the light crosses the threshold set by the blue potentiometer. The Analog Output (AO) bypasses the LM393 chip and gives a continuous, varying voltage reading that represents the exact brightness of the room.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I change when the digital output triggers?\u003c\/strong\u003e\u003cbr\u003e\nA: Use a small flathead or Phillips screwdriver to turn the brass screw on the blue potentiometer block. Turning it changes the resistance threshold of the LM393 comparator, making the sensor more or less sensitive to the surrounding light.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I connect this directly to a 220V\/240V AC lightbulb?\u003c\/strong\u003e\u003cbr\u003e\nA: No. This module operates on 3.3V or 5V DC and outputs a low-current logic signal. To control a mains AC lightbulb, you must route the sensor's output to a microcontroller or a transistor circuit, which then triggers a power relay (like a 12V SPDT relay) to handle the AC load safely.\u003c\/p\u003e","brand":"Generic","offers":[{"title":"Default Title","offer_id":49534847353070,"sku":"SEN-27591","price":34.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2132\/9029\/files\/LDR_SENSOR_MODULE_IMPORTED.jpg?v=1788508135","url":"https:\/\/www.tomsonelectronics.com\/products\/ldr-light-sensor-module-photoresistor","provider":"Tomson Electronics ","version":"1.0","type":"link"}