{"product_id":"5549-5mm-ldr-photosensitive-resistor","title":"5549 5MM LDR Photosensitive Resistor","description":"\u003cdiv class=\"product_info\"\u003e\n\u003ch2 class=\"sing--sub-heading\"\u003e\u003cspan style=\"font-size: 18.72px;\"\u003e5549 5MM Sensor Light Dependent Resistor\u003c\/span\u003e\u003c\/h2\u003e\nThe \u003cstrong\u003e5549 5MM LDR Photosensitive Resistor\u003c\/strong\u003e is a high-quality \u003cstrong\u003eLDR sensor\u003c\/strong\u003e that changes its resistance according to ambient light. This \u003cstrong\u003esensor light dependent resistor\u003c\/strong\u003e suits indoor and outdoor light-sensing—from automatic streetlights to night lamps—and integrates cleanly with an \u003cstrong\u003earduino ldr sensor\u003c\/strong\u003e setup. Thanks to a competitive \u003cstrong\u003eldr price\u003c\/strong\u003e, it remains a popular choice for DIY automation and education. \u003cbr\u003e\u003cbr\u003eWhen the surrounding light increases, the resistance across the sensor’s terminals decreases, allowing easy detection of brightness levels. Conversely, in darkness, the resistance rises significantly. This behavior makes the \u003cstrong\u003eLDR light sensor\u003c\/strong\u003e a staple in modern electronics for tasks such as light measurement, motion detection, and automation. \u003cbr\u003e\u003cbr\u003eConstructed using two Cadmium Sulphide (CdS) photo-conductive cells, this sensor exhibits a spectral response similar to that of the human eye. Its resistance drops rapidly with increasing light intensity, providing quick response and reliable output. Common applications include smoke detection, automatic lighting, batch counting, and burglar alarm systems.\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eTechnical Details – Arduino LDR Sensor Compatibility\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds ls-n\"\u003e\n\u003cli\u003eDiameter: 5mm\u003c\/li\u003e\n\u003cli\u003eMax Voltage: 150V DC\u003c\/li\u003e\n\u003cli\u003eMax Power: 100mW\u003c\/li\u003e\n\u003cli\u003eOperating Temp: -30°C to 70°C\u003c\/li\u003e\n\u003cli\u003eSpectrum Peak: 540nm\u003c\/li\u003e\n\u003cli\u003eLength with Terminals: 32mm\u003c\/li\u003e\n\u003cli\u003eDark Resistance: 10MΩ (0 Lux)\u003c\/li\u003e\n\u003cli\u003eLight Resistance: 100–200KΩ (10 Lux)\u003c\/li\u003e\n\u003cli\u003eModel: 5549\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eAnalog Applications\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cp\u003eThese use-cases show how a sensor light dependent resistor enables smooth analog control and consistent light tracking.\u003c\/p\u003e\n\u003cul class=\"pro-ds ls-n\"\u003e\n\u003cli\u003eCamera exposure control\u003c\/li\u003e\n\u003cli\u003eAuto slide focus – dual cell systems\u003c\/li\u003e\n\u003cli\u003ePhotocopy machines – toner density detection\u003c\/li\u003e\n\u003cli\u003eColorimetric test equipment\u003c\/li\u003e\n\u003cli\u003eDensitometers and exposure meters\u003c\/li\u003e\n\u003cli\u003eElectronic scales – dual cell balance\u003c\/li\u003e\n\u003cli\u003eAutomatic gain control – modulated light sources\u003c\/li\u003e\n\u003cli\u003eAutomated rear-view mirror brightness control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eDigital Applications – Using Arduino LDR Sensor\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003eIn digital circuits, the sensor light dependent resistor supports threshold-based switching and reliable event detection.\n\u003cul class=\"pro-ds ls-n\"\u003e\n\u003cli\u003eAutomatic headlight dimmers\u003c\/li\u003e\n\u003cli\u003eNightlight control circuits\u003c\/li\u003e\n\u003cli\u003eOil burner flame detection\u003c\/li\u003e\n\u003cli\u003eStreetlight control systems\u003c\/li\u003e\n\u003cli\u003ePresence or absence detection (beam breaker)\u003c\/li\u003e\n\u003cli\u003ePosition and proximity sensors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eFeatures\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cp\u003eThe sensor light dependent resistor offers practical advantages for both prototyping and production designs.\u003c\/p\u003e\n\u003cul class=\"pro-ds ls-n\"\u003e\n\u003cli\u003eAccurate and consistent light detection\u003c\/li\u003e\n\u003cli\u003eSimple to interface with microcontrollers and analog circuits\u003c\/li\u003e\n\u003cli\u003eCompact 5mm package, easy to mount on breadboards or PCBs\u003c\/li\u003e\n\u003cli\u003eFast response time with high safety and reliability\u003c\/li\u003e\n\u003cli\u003eEco-friendly design with low power consumption\u003c\/li\u003e\n\u003cli\u003eDurable, low-cost, and easy to integrate into projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eApplications – Affordable LDR Price\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds ls-n\"\u003e\n\u003cli\u003eAutomatic streetlight and nightlight systems\u003c\/li\u003e\n\u003cli\u003eCamera exposure and brightness control\u003c\/li\u003e\n\u003cli\u003eFlame and light detection in safety circuits\u003c\/li\u003e\n\u003cli\u003ePresence and position sensing in automation\u003c\/li\u003e\n\u003cli\u003eLight-activated alarms and security devices\u003c\/li\u003e\n\u003cli\u003eSolar-powered lighting and energy systems\u003c\/li\u003e\n\u003cli\u003eBrightness adjustment for displays and screens\u003c\/li\u003e\n\u003cli\u003eIndustrial and smart lighting control systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\n\u003ctable class=\"styled-table-rahul\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eMax Pressure (VDC)\u003c\/th\u003e\n\u003cth\u003eMax Power (mW)\u003c\/th\u003e\n\u003cth\u003eAmbient Temp (°C)\u003c\/th\u003e\n\u003cth\u003eSpectral Peak (nm)\u003c\/th\u003e\n\u003cth\u003eBright Resistance (Ω)\u003c\/th\u003e\n\u003cth\u003eDark Resistance (MΩ)\u003c\/th\u003e\n\u003cth\u003eResponse Time (ms)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5506\u003c\/td\u003e\n\u003ctd\u003e150\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e-30~+70\u003c\/td\u003e\n\u003ctd\u003e540\u003c\/td\u003e\n\u003ctd\u003e4-7\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003eRise:30 Fall:30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5516\u003c\/td\u003e\n\u003ctd\u003e150\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e-30~+70\u003c\/td\u003e\n\u003ctd\u003e540\u003c\/td\u003e\n\u003ctd\u003e5-10\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003eRise:30 Fall:30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5528\u003c\/td\u003e\n\u003ctd\u003e150\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e-30~+70\u003c\/td\u003e\n\u003ctd\u003e540\u003c\/td\u003e\n\u003ctd\u003e10-20\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eRise:20 Fall:30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5537\u003c\/td\u003e\n\u003ctd\u003e150\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e-30~+70\u003c\/td\u003e\n\u003ctd\u003e540\u003c\/td\u003e\n\u003ctd\u003e20-30\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eRise:20 Fall:30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5549\u003c\/td\u003e\n\u003ctd\u003e150\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e-30~+70\u003c\/td\u003e\n\u003ctd\u003e540\u003c\/td\u003e\n\u003ctd\u003e100-200\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003eRise:20 Fall:30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\" style=\"text-align: center;\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eDrawing (mm)\u003c\/h3\u003e\n\u003cp\u003e\u003cimg alt=\"Dimension diagram of 5mm 5549 LDR for circuit planning\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/files\/LDR-Dimensions_480x480.png?v=1694415531\" style=\"float: none;\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePackage Includes\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds ls-n\"\u003e\n\u003cli\u003e1 × 5549 5MM LDR Photosensitive Resistor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"Default Title","offer_id":46950816579836,"sku":"KG1051","price":5.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/files\/5mm-5549-light-dependent-resistor-front.jpg?v=1762254487","url":"https:\/\/kitsguru.com\/es\/products\/5549-5mm-ldr-photosensitive-resistor","provider":"KitsGuru","version":"1.0","type":"link"}