{"product_id":"3mm-ir-pair","title":"3mm IR Pair","description":"\u003cmeta name=\"description\" content=\"Buy 3mm IR Pair online in India at best price from The Tech Depot, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\u003ch1\u003e3mm IR Pair - Infrared Emitter \u0026amp; Receiver LED Set\u003c\/h1\u003e\n\u003cp\u003eCompact 3mm infrared transmitter and receiver pair from The Tech Depot, Bengaluru. Ideal for object detection, line-following robots, proximity sensing, and optical communication projects. Operates at 940nm wavelength for reliable, invisible IR beam transmission. Fast shipping, 7-day warranty on manufacturing defects, and dedicated 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\u003eIR LED Emitter + IR Photodiode Receiver Pair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Diameter\u003c\/td\u003e\n\u003ctd\u003e3mm (T-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e940nm (Infrared, Invisible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmitter Forward Voltage\u003c\/td\u003e\n\u003ctd\u003e1.2V - 1.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmitter Forward Current\u003c\/td\u003e\n\u003ctd\u003e20mA (Max 50mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReceiver Reverse Voltage\u003c\/td\u003e\n\u003ctd\u003e5V Max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDetection Range\u003c\/td\u003e\n\u003ctd\u003eUp to 10-15cm (varies with circuit design)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e~20 degrees - 30 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmitter Color (Visible)\u003c\/td\u003e\n\u003ctd\u003eClear\/Transparent (slightly bluish tint)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReceiver Color (Visible)\u003c\/td\u003e\n\u003ctd\u003eClear\/Dark\/Smoky (blackish tint)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eThrough-Hole, 2-pin each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-25 degreesC to +85 degreesC\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\u003eWhy Choose This 3mm IR Pair?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatched Pair:\u003c\/strong\u003e Emitter and receiver are wavelength-matched at 940nm for optimal detection accuracy and signal strength\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact 3mm Form Factor:\u003c\/strong\u003e Small size fits easily on breadboards, PCBs, and tight robot chassis layouts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Power Consumption:\u003c\/strong\u003e Operates at just 20mA, making it perfect for battery-powered and microcontroller-driven projects\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInvisible IR Beam:\u003c\/strong\u003e 940nm wavelength is invisible to the human eye, enabling discreet sensing without visual interference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Works seamlessly with Arduino, ESP32, Raspberry Pi, STM32, PIC, and all common microcontrollers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreadboard Friendly:\u003c\/strong\u003e Standard through-hole pins plug directly into breadboards and perfboards for rapid prototyping\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Authentic:\u003c\/strong\u003e Sourced directly from trusted suppliers with verified quality\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-5 days shipping:\u003c\/strong\u003e Fast delivery from our Bengaluru warehouse across India\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eThe 3mm IR pair consists of two components that work together. The \u003cstrong\u003eIR emitter\u003c\/strong\u003e (transmitter LED) emits infrared light at 940nm when forward-biased with a current-limiting resistor. The \u003cstrong\u003eIR receiver\u003c\/strong\u003e (photodiode) detects this infrared light and changes its conductivity accordingly. When an object is placed between or in front of the pair, the IR beam is either blocked or reflected, causing a measurable change in the receiver's output. This change can be read by a microcontroller's analog or digital pin to detect presence, distance, or surface color (for line following).\u003c\/p\u003e\n\n\u003ch2\u003eProject Ideas\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine-Following Robot:\u003c\/strong\u003e Mount the IR pair facing downward to detect black lines on a white surface - the foundation of every classic robotics project\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eObject\/Obstacle Detection:\u003c\/strong\u003e Position emitter and receiver side by side to detect reflected IR light from nearby objects for collision avoidance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProximity Sensor:\u003c\/strong\u003e Build a simple proximity switch that activates when a hand or object comes within range - great for touchless switches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisitor Counter:\u003c\/strong\u003e Place the IR pair across a doorway to count people entering and exiting a room with microcontroller-based counting logic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed\/RPM Measurement:\u003c\/strong\u003e Use the IR pair with a slotted disc attached to a motor shaft to measure rotational speed for tachometer projects\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Encoder:\u003c\/strong\u003e Create a DIY rotary encoder by pairing with a coded disc for position feedback in motor control systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIR Communication Link:\u003c\/strong\u003e Transmit simple data wirelessly over short distances using modulated IR signals between two microcontrollers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Detection for Robots:\u003c\/strong\u003e Mount facing downward on a tabletop robot to detect table edges and prevent falls\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecurity Beam Break Alarm:\u003c\/strong\u003e Set up an invisible tripwire that triggers a buzzer or alert when the IR beam is interrupted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquid Level Sensor:\u003c\/strong\u003e Detect liquid levels in transparent containers by monitoring IR beam transmission through the container wall\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBasic Wiring Guide\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIR Emitter (Transmitter) Circuit:\u003c\/strong\u003e Connect the anode (longer leg) of the IR LED through a 220Ohm current-limiting resistor to 5V (or 3.3V with 100Ohm resistor). Connect the cathode (shorter leg) to GND. The IR LED will\u003c\/p\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 3mm IR Pair Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003e3mm IR Pair\u003c\/strong\u003e online at \u003ca href=\"https:\/\/thetechdepot.in\"\u003eThe Tech Depot\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\u003e3mm IR Pair\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\u003e3mm IR Pair\u003c\/strong\u003e at the best price in India? The Tech Depot 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":"The Tech Depot","offers":[{"title":"Default Title","offer_id":48746537058561,"sku":"TTD-17431","price":8.48,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/1577\/3185\/files\/40de83701bc183b6de582bba74fbd81b.jpg?v=1778107068","url":"https:\/\/techdepot.in\/products\/3mm-ir-pair","provider":"Tech Depot India","version":"1.0","type":"link"}