--- product_id: 95440958 title: "3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 70cm Line IR Counter Module" brand: "biaobiao" price: "$2.03" currency: USD in_stock: false reviews_count: 8 url: https://www.desertcart.us/products/95440958-3-pack-optical-limit-switches-endstop-with-comparison-circuit-lm393 store_origin: US region: United States of America --- # 5+ Year Lifespan 0.002mm Accuracy 3D Printer Ready 3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 70cm Line IR Counter Module **Brand:** biaobiao **Price:** $2.03 **Availability:** ❌ Out of Stock ## Summary > 🔌 Plug into Precision! ## Quick Answers - **What is this?** 3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 70cm Line IR Counter Module by biaobiao - **How much does it cost?** $2.03 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/95440958-3-pack-optical-limit-switches-endstop-with-comparison-circuit-lm393) ## Best For - biaobiao enthusiasts ## Why This Product - Trusted biaobiao brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable Design:** Enjoy a long-lasting photoelectric module with a lifespan exceeding 5 years—no wear and tear! - • **Easy Installation:** Comes with a 70cm line for hassle-free plug-and-play setup—get started in no time! - • **No Mechanical Hassles:** Say goodbye to mechanical limits—no deformation or resistance, just smooth operation. - • **Precision Engineering:** Experience repeatable trigger accuracy of less than 0.002mm for flawless operation. - • **Versatile Applications:** Perfect for 3D printers, Arduino projects, and DIY electronics—limit switch, motor counter, and more. ## Overview The 3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 is designed for 3D printers and DIY electronics, offering a long lifespan, high precision, and versatile applications without the mechanical drawbacks. ## Description Optical endstop limiters / photoelectric limit switches are much more accurate than mechanical switches, which is essential for printing certain precision instruments. This module is different from the mechanical micro switch, and it will not cause errors due to deformation of the mechanical structure for a long time. The integrated high-precision comparison IC LM393 has higher precision than the simple photoelectric switch. The ordinary photoelectric switch will generate current and voltage fluctuations during the process of approaching the closing, which will cause some circuits to generate false triggers. This module will only be in LOW and Change between HIGH. This is especially important for the Z axis of 3D printers. Size:21.1mm * 25.3mm *14mm Voltage: DC 5V Package Include: Photoelectric Switches module * 3pcs 70cm Line * 3pcs Review: Works great with Duet controller board's 3.3V at the endstop connector. - I used these to replace the microswitch endstops in my printer. Having the LED on the endstop module makes setting the endstop trigger point very easy. Be careful if using with Duet- the signal and VCC leads are swapped compared to the the terminals on the endstop module- you'll have to swap the wires in the connector at the controller board end of the cable. These are active high endstops, so make sure your config file is set correctly. Review: Decent! Works fine for the price - Decent! Works fine for the price ## Features - Best for 3D Printer: No mechanical and physical contact, no deformation like mechanical limit, no resistance to mechanical knot operation - Long life: Photoelectric module has long life over 5 years, Not fail or cause errors on Long term use . - High resolution: With LM393 Comparison IC, Repeatable trigger accuracy is less than 0.002mm - Multi-Function: Can be used for 3D Printer, Arduino or other DIY as Endstop,Motor Counter, Electronic Counter, Limit Switcher - With 70cm Line, Just buy it and plug-in your machine. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07JMDLD84 | | Brand Name | BIAOBIAO | | Color | Onecolor | | Connectivity Protocol | X-10 | | Connector Type | Plug In | | Contact Type | Normally Open | | Customer Reviews | 4.6 4.6 out of 5 stars (17) | | International Protection Rating | IP68 | | Manufacturer | BIAOBIAO | | Material Type | absylux | | Mounting Type | Plug-In Mount | | Operating Voltage | 5 Volts | | Operation Mode | Mechanical | | Part Number | BB-IM-S14 | | Switch Type | Limit Switch | | Unit Count | 3.0 Count | ## Product Details - **Brand:** BIAOBIAO - **Connectivity Protocol:** X-10 - **Connector Type:** Plug In - **Contact Type:** Normally Open - **International Protection Rating:** IP68 - **Material:** absylux - **Mounting Type:** Plug-In Mount - **Operating Voltage:** 5 Volts - **Operation Mode:** Mechanical - **Switch Type:** Limit Switch ## Images ![3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 70cm Line IR Counter Module - Image 1](https://m.media-amazon.com/images/I/81pDMWZPpkL.jpg) ![3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 70cm Line IR Counter Module - Image 2](https://m.media-amazon.com/images/I/81-RknizGeL.jpg) ![3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 70cm Line IR Counter Module - Image 3](https://m.media-amazon.com/images/I/71UwVBZPlmL.jpg) ![3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 70cm Line IR Counter Module - Image 4](https://m.media-amazon.com/images/I/71GAwkNRQUL.jpg) ![3 Pack Optical Limit Switches Endstop with Comparison Circuit LM393 70cm Line IR Counter Module - Image 5](https://m.media-amazon.com/images/I/61YykPdkolL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great with Duet controller board's 3.3V at the endstop connector. *by M***T on January 21, 2020* I used these to replace the microswitch endstops in my printer. Having the LED on the endstop module makes setting the endstop trigger point very easy. Be careful if using with Duet- the signal and VCC leads are swapped compared to the the terminals on the endstop module- you'll have to swap the wires in the connector at the controller board end of the cable. These are active high endstops, so make sure your config file is set correctly. ### ⭐⭐⭐⭐ Decent! Works fine for the price *by T***Y on December 15, 2019* Decent! Works fine for the price ### ⭐⭐ 2 of 3 Did Not Work *by J***J on February 12, 2020* Only one of the three Optical Limit Switches worked. Other two were defective. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/95440958-3-pack-optical-limit-switches-endstop-with-comparison-circuit-lm393](https://www.desertcart.us/products/95440958-3-pack-optical-limit-switches-endstop-with-comparison-circuit-lm393) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-28*