{"product_id":"5mm-ldr-light-dependent-resistor","title":"5mm LDR (Light Dependent Resistor)","description":"\u003cmeta name=\"description\" content=\"Buy 5mm LDR Light Dependent Resistor online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n```html\n\u003ch1\u003e5mm LDR (Light Dependent Resistor)\u003c\/h1\u003e\n\u003cp\u003eA compact 5mm photoresistor that changes resistance based on ambient light intensity - essential for light-sensing circuits, automatic lighting systems, and Arduino\/microcontroller projects. Available at The Engineer Store, Bengaluru with fast shipping and full technical support.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eComponent Type\u003c\/td\u003e\n\u003ctd\u003eLight Dependent Resistor (Photoresistor)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Diameter\u003c\/td\u003e\n\u003ctd\u003e5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Resistance (10 Lux)\u003c\/td\u003e\n\u003ctd\u003e8-20 kOhm (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDark Resistance\u003c\/td\u003e\n\u003ctd\u003e1 MOhm (minimum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Wavelength\u003c\/td\u003e\n\u003ctd\u003e~540 nm (green light)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpectral Response\u003c\/td\u003e\n\u003ctd\u003eVisible light range (400-700 nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Voltage\u003c\/td\u003e\n\u003ctd\u003e150V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Power Dissipation\u003c\/td\u003e\n\u003ctd\u003e100 mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse Time (Rise)\u003c\/td\u003e\n\u003ctd\u003e~20 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse Time (Fall)\u003c\/td\u003e\n\u003ctd\u003e~30 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-30 degreesC to +70 degreesC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCadmium Sulfide (CdS) photoconductive cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eThrough-hole, 2-pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal \/ Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7-day warranty on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003eEmail \u0026amp; WhatsApp 24\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog Light Sensing:\u003c\/strong\u003e Resistance decreases smoothly as light intensity increases - provides a simple analog signal proportional to brightness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Resistance Range:\u003c\/strong\u003e From ~10 kOhm in bright light to over 1 MOhm in complete darkness, offering excellent sensitivity across lighting conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Polarity:\u003c\/strong\u003e A passive, non-polarized component - connect either lead to either side of your circuit without worrying about orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact 5mm Form Factor:\u003c\/strong\u003e The most popular LDR size, fitting easily into breadboards, PCBs, and enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreadboard \u0026amp; PCB Friendly:\u003c\/strong\u003e Standard through-hole leads plug directly into solderless breadboards or solder neatly onto perfboards and custom PCBs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Power Consumption:\u003c\/strong\u003e Draws minimal current, making it ideal for battery-powered and low-power IoT applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Response Time:\u003c\/strong\u003e ~20-30 ms response allows detection of rapid light changes for dynamic applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with All Microcontrollers:\u003c\/strong\u003e Pairs perfectly with Arduino, ESP32, Raspberry Pi Pico, STM32, and any platform with an analog input or ADC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eAn LDR is made from cadmium sulfide (CdS), a semiconductor material whose electrical resistance changes with light exposure. When photons strike the CdS surface, they free electrons, increasing conductivity and lowering resistance. In darkness, fewer electrons are free, so resistance climbs to over 1 MOhm. By placing the LDR in a voltage divider circuit with a fixed resistor, you can convert this resistance change into a measurable voltage that a microcontroller's analog-to-digital converter (ADC) can read - giving you a numerical light level in your code.\u003c\/p\u003e\n\n\u003ch2\u003eBasic Wiring Guide\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Divider (most common):\u003c\/strong\u003e Connect one LDR lead to VCC (3.3V or 5V), the other lead to a 10 kOhm fixed resistor going to GND. Read the voltage at the junction (middle node) using an analog input pin on your microcontroller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith Arduino:\u003c\/strong\u003e LDR -\u0026gt; A0 analog pin via voltage divider. Use \u003ccode\u003eanalogRead(A0)\u003c\/code\u003e to get values from 0 (dark) to 1023 (bright light).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith ESP32:\u003c\/strong\u003e Same voltage divider to any ADC-capable GPIO. Use 3.3V supply for accurate 12-bit ADC readings (0-4095).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandalone Trigger:\u003c\/strong\u003e Pair with a transistor or comparator (e.g., LM393) to create a simple light-activated switch without a microcontroller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip:\u003c\/strong\u003e Adjust the fixed resistor value (1 kOhm-100 kOhm) to shift the sensitivity range to match your target lighting conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProject Ideas\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Street Light:\u003c\/strong\u003e Build a circuit that turns on an LED or relay-controlled lamp at dusk and off at dawn - a classic embedded systems project.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart Plant Monitor:\u003c\/strong\u003e Measure sunlight exposure for indoor plants and alert via buzzer or app when light levels are too low.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine-Following Robot:\u003c\/strong\u003e Use multiple LDRs to detect contrast between a dark line and a light surface for basic robot navigation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight-Level Data Logger:\u003c\/strong\u003e Record ambient brightness over 24 hours using Arduino + SD card module for environmental studies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecurity Alarm:\u003c\/strong\u003e Detect\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eProducts ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs technical support available?\u003c\/summary\u003e\n\u003cp\u003eYes, 24\/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return policy?\u003c\/summary\u003e\n\u003cp\u003e7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2\u003eBuy 5mm LDR (Light Dependent Resistor) Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003e5mm LDR (Light Dependent Resistor)\u003c\/strong\u003e online at \u003ca href=\"https:\/\/theengineerstore.in\"\u003eThe Engineer Store\u003c\/a\u003e - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on \u003cstrong\u003e5mm LDR (Light Dependent Resistor)\u003c\/strong\u003e with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.\u003c\/p\u003e\n\u003cp\u003eLooking to buy \u003cstrong\u003e5mm LDR (Light Dependent Resistor)\u003c\/strong\u003e at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43773777051811,"sku":"TES-EV102622","price":15.16,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/ldr_big.jpg?v=1701074453","url":"https:\/\/www.theengineerstore.in\/zh-hant\/products\/5mm-ldr-light-dependent-resistor","provider":"The Engineer Store","version":"1.0","type":"link"}