--- product_id: 41086123 title: "Adafruit IR Break Beam Sensor - 3mm LEDs [ADA2167]" brand: "adafruit" price: "HK$94" currency: HKD in_stock: true reviews_count: 13 url: https://www.desertcart.hk/products/41086123-adafruit-ir-break-beam-sensor-3mm-leds-ada2167 store_origin: HK region: Hong Kong --- # Ultra-fast <2ms response Precise 10" (25cm) detection range Dual voltage 3.3-5.5V power Adafruit IR Break Beam Sensor - 3mm LEDs [ADA2167] **Brand:** adafruit **Price:** HK$94 **Availability:** βœ… In Stock ## Summary > πŸš€ Detect motion at the speed of light β€” don’t let your projects lag behind! ## Quick Answers - **What is this?** Adafruit IR Break Beam Sensor - 3mm LEDs [ADA2167] by adafruit - **How much does it cost?** HK$94 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/41086123-adafruit-ir-break-beam-sensor-3mm-leds-ada2167) ## Best For - adafruit enthusiasts ## Why This Product - Trusted adafruit brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Flexible power options:** Runs efficiently on 3.3V or 5V, with enhanced range at 5V for professional-grade setups. - β€’ **Pinpoint sensing control:** Target exact zones with a focused 10Β° IR beam and 10-inch range for smarter monitoring. - β€’ **Robust output capability:** Open collector transistor output sinks up to 100mA, perfect for driving relays or LEDs directly. - β€’ **Compact & lightweight design:** Slim 20x10x8mm modules weighing just 3g each, ideal for sleek, unobtrusive installations. - β€’ **Lightning-fast motion detection:** Break beams react in under 2 milliseconds, leaving PIR sensors in the dust. ## Overview The Adafruit IR Break Beam Sensor (3mm LEDs) offers ultra-fast, precise motion detection with a 10-inch range and sub-2ms response time. Powered by 3.3-5.5V, it features an open collector output capable of sinking 100mA, making it ideal for professional and DIY security or automation projects requiring pinpoint accuracy and reliable performance. ## Description Infrared (IR) break-beam sensors are a simple way to detect motion. They work by having an emitter side that sends out a beam of human-invisible IR light, then a receiver across the way which is sensitive to that same light. When something passes between the two, and its not transparent to IR, then the 'beam is broken' and the receiver will let you know. Compared to PIR sensors, breakbeams are faster and allow better control of where you want to detect the motion. Compared to Sonar modules, they're less expensive. However, you do need both emitter and receiver on opposite sides of the area you want to monitor. This is the 3mm IR version. It works up to 25cm / 10". You can power it from 3.3V or 5V, but 5V will get you better range and is what we suggest. The receiver is open collector transistor output which means that you do need a pull up resistor if you want to read a digital signal off the signal wire. Most microcontrollers have the ability to turn on a built in pull up resistor. If you do not, connect a 10K resistor between the white wire of the receiver and the red wire. If you want to control a relay or LED or whatever, it can sink up to 100mA to ground Item Specifics Sensing Distance: Approx 25cm / 10" Power Voltage: 3.3 - 5.5VDC Emitter Current Draw: 10mA @ 3.3V, 20mA @ 5V Output Current Capability of receiver: 100mA sink Transmitter/Receiver LED Angle: 10Β° Response Time: <2 ms Dimensions: 20mm x 10mm x 8mm / 0.8" x 0.4" x 0.3" Cable Length: 234mm / 9.2" Weight (of each half): ~3g ## Features - Simple way to detect motion - Faster than PIR sensors and allow better control of where you want to detect the motion - Works up to 10 inches - Open collector transistor output receiver ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B01BU6YBWU | | Battery Type | battery not included | | Best Sellers Rank | #46,742 in Electronics (See Top 100 in Electronics) #190 in Motion Detectors (Electronics) | | Brand | Adafruit | | Color | Black | | Customer Reviews | 4.5 4.5 out of 5 stars (122) 4.5 out of 5 stars | | Date First Available | February 16, 2016 | | Is Discontinued By Manufacturer | No | | Item Model Number | 2167 | | Item Weight | 0.01 ounces | | Manufacturer | Adafruit | | Package Dimensions | 2.91 x 2.4 x 0.39 inches | | Power Source | Corded Electric | ## Product Details - **Brand:** Adafruit - **Color:** Black - **Item Weight:** 0.01 Ounces - **Maximum Range:** 25 Centimeters - **Power Source:** Corded Electric ## Images ![Adafruit IR Break Beam Sensor - 3mm LEDs [ADA2167] - Image 1](https://m.media-amazon.com/images/I/41yytLApGKL.jpg) ![Adafruit IR Break Beam Sensor - 3mm LEDs [ADA2167] - Image 2](https://m.media-amazon.com/images/I/41FEv0ZcTTL.jpg) ![Adafruit IR Break Beam Sensor - 3mm LEDs [ADA2167] - Image 3](https://m.media-amazon.com/images/I/41pBQEZVwwL.jpg) ## Questions & Answers **Q: Where is the IR breakbeam tutorial ?** A: https://learn.adafruit.com/ir-breakbeam-sensors/overview **Q: The holes under the emitter and receiver; are they screw holes for mounting? Or part of the system? Ie: can they be blocked without effecting the unit** A: Yes, they are for mounting and can be blocked without issue. **Q: 1 piece - does it mean that I need 2 items to implement a solution? The photos shows always 2 items. Or package includes sender and receiver as 1p.** A: Package Includes Send and Receive components as 1 piece. **Q: Does the ir breakbeam detect transparent objects? if so, how well does it tell the difference between tranparent and opaque?** A: They are quite sensitive they will definitely detect opaque and probably transparent ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works as Described *by on Reviewed in the United States August 7, 2025* Works as intended. Sensors are simple and easy to control with your favorite microcontroller. ### ⭐⭐⭐⭐⭐ Awesome. *by on Reviewed in the United States February 14, 2024* Someone wrote a review about small wires. Not sure what they are talking about. It comes with dupont pins as shown in pic and wires are smallish but are as expected. Everything is good and it works perfect for what I'm doing. ### ⭐⭐⭐⭐ Works well for triggering lights/audio handsfree - wiring is fragile! *by on Reviewed in the United States January 13, 2020* I used this break beam sensor in a musical project where I needed to run the lights and sound for my "One-Guitar Show" from the stage using an Arduino Nano and an nRF24L01 radio to relay the trigger to a Master Arduino Uno controlling an MP3 player and DMX controller (for lighting). I placed the sensors inside the guitar's sound hole (at 6:00 and 12:00). I could then trigger the cues while playing simply while dipping my fingers into the sound hole briefly. I also mounted a manual button on the outside of the guitar for times I wasn't playing. Worked great! My only issue is that the wires for these sensors are SUPER THIN and don't hold up well to repeated plugging and unplugging. Mount carefully and reinforce the wiring! Would like to see some sturdier wires on these guys. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hk/products/41086123-adafruit-ir-break-beam-sensor-3mm-leds-ada2167](https://www.desertcart.hk/products/41086123-adafruit-ir-break-beam-sensor-3mm-leds-ada2167) --- *Product available on Desertcart Hong Kong* *Store origin: HK* *Last updated: 2026-07-21*