--- product_id: 567544725 title: "HiLetgo 2pcs NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open" brand: "hiletgo" price: "€ 34.36" currency: EUR in_stock: true reviews_count: 5 category: "Hi Letgo" url: https://www.desertcart.sk/products/567544725-hiletgo-2pcs-njk-5002c-hall-effect-sensor-proximity-switch-npn store_origin: SK region: Slovakia --- # 5-30VDC wide voltage range 10mm precise detection distance LED output indicator HiLetgo 2pcs NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open **Brand:** hiletgo **Price:** € 34.36 **Availability:** ✅ In Stock ## Summary > 🔍 Elevate your sensing game with precision and style! ## Quick Answers - **What is this?** HiLetgo 2pcs NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open by hiletgo - **How much does it cost?** € 34.36 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/567544725-hiletgo-2pcs-njk-5002c-hall-effect-sensor-proximity-switch-npn) ## Best For - hiletgo enthusiasts ## Why This Product - Trusted hiletgo brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Clear Visual Feedback:** Integrated red LED indicator confirms sensor activation instantly - • **Compact & Durable Design:** Sleek 12mm diameter metal body built to last in demanding environments - • **Plug & Play Magnetic Sensing:** Effortlessly detect metal objects with a reliable 10mm proximity range - • **Robust Voltage Compatibility:** Operates seamlessly between 5 to 30 volts DC for versatile applications - • **Perfect for Smart DIY Projects:** Easily integrates with Raspberry Pi and other microcontrollers for next-level automation ## Overview The HiLetgo NJK-5002C Hall Effect Sensor is a compact, metal-bodied proximity switch designed for detecting metal objects within a 10mm range. Operating on a wide 5-30V DC supply, it features an NPN open-collector output and a handy red LED indicator for real-time status. Ideal for smart home automation and DIY electronics, it integrates smoothly with platforms like Raspberry Pi, making it a must-have for tech-savvy professionals seeking reliable, precise sensing solutions. ## Description Description: Model: NJK-5002C Supply voltage 5-30VDC Detection distance 10mm (effective detection distance 0-10mm) Load current 150MA (no more than) Output form NPN three lines Output state normally open (NO) Detect objects metal material Product Material Metal parts: Copper plastic components: PBT External leads 1.2 m (standard, others according to customer requirements) Output indication LED (red) Factor Diameter: 12MM; Thread length: 12MM; Overall Length: 37MM Package Include: 2* NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open Review: I'm currently using one of these to sense the state of my overhead garage door. It is behaving and functioning as a Hall Effect Proximity Sensor should. Each one comes with a small magnet for activation. I found a location where I could mount the sensor on a bracket the holds the garage door tracks. I just needed to enlarge a hole a bit to hold the sensor. I epoxied a magnet to the edge of the garage door where it would be aligned with the sensor when the door is closed. I have about 3/8" (about 9 - 10 mm) air gap between the magnet and sensor, and it is working fine. I have the sensor connected directly to the Raspberry Pi as follows: The sensor's brown wire connects to pin 2 of the GPIO header for the +5V supply. The sensor's blue wire connects to pin 6 of the GPIO header for the ground connection. The sensor's black wire connects to pin 8 (or any input of your choice -- configure your software to match.) The black wire/Pin 8 also needs to connect to a resistor (2200 - 4700 ohm is fine) and the other side of that resistor connects to pin 1 (3.3 V) of the Raspberry Pi GPIO connector. The black wire in the sensor provides an open-drain output, which means that it can provide a ground-level signal to pin 8 in one state, but to provide a voltage to pin 8 in the other state, you need to use the resistor (pull-up resistor) that connects to the Pi's 3.3V The Raspberry Pi inputs cannot tolerate more than 3.3 volts on an input pin. The specifications state that it has an NPN transistor output, and that configuration would be called open-collector, which in this application, works the same as the open drain output on what is clearly a FET: The on-state (conducting) voltage drop from black to blue wire was measured at about 20 millivolts. Review: It requires a magnetic field to change state. If a magnetic field is not involved -- NO WORKY PEOPLE! Magnets work well! ## Features - NJK-5002C Hall Effect Sensor Proximity Switch - Model: NJK-5002C - Supply voltage 5-30VDC - Detection distance 10mm (effective detection distance 0-10mm) - Factor Diameter: 12MM; Thread length: 12MM; Overall Length: 37MM ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01MZYYCLH | | Customer Reviews | 4.1 4.1 out of 5 stars (82) | | Date First Available | 28 Nov. 2016 | | Item Weight | 82 g | | Item model number | 3-01-1229 | | Other display features | Wireless | | Package Dimensions | 10.9 x 7.9 x 2.9 cm; 82 g | ## Images ![HiLetgo 2pcs NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open - Image 1](https://m.media-amazon.com/images/I/31Nwgc2EDRL.jpg) ![HiLetgo 2pcs NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open - Image 2](https://m.media-amazon.com/images/I/31qWJcDHPaL.jpg) ![HiLetgo 2pcs NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open - Image 3](https://m.media-amazon.com/images/I/41I+YcTZd5L.jpg) ![HiLetgo 2pcs NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open - Image 4](https://m.media-amazon.com/images/I/41LU0pBmXcL.jpg) ![HiLetgo 2pcs NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open - Image 5](https://m.media-amazon.com/images/I/51+Du5sRIiL.jpg) ## Questions & Answers **Q: Would this work for a kill switch?** A: Depends upon what you trying to ‘kill’. The short answer is NO. This would need to control a relay that you would use in the kill circuit as this device is limited on the power it is able to handle. **Q: Could this be used as a reverse light switch on a side by side?** A: Yes but you will need to add some electronic circuitry for this. **Q: Does this need to use a resistor between V+ and Data out? If it does, what resistor did you use** A: A pull up resistor wasn’t needed for my application ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by C***8 on 4 October 2021* I'm currently using one of these to sense the state of my overhead garage door. It is behaving and functioning as a Hall Effect Proximity Sensor should. Each one comes with a small magnet for activation. I found a location where I could mount the sensor on a bracket the holds the garage door tracks. I just needed to enlarge a hole a bit to hold the sensor. I epoxied a magnet to the edge of the garage door where it would be aligned with the sensor when the door is closed. I have about 3/8" (about 9 - 10 mm) air gap between the magnet and sensor, and it is working fine. I have the sensor connected directly to the Raspberry Pi as follows: The sensor's brown wire connects to pin 2 of the GPIO header for the +5V supply. The sensor's blue wire connects to pin 6 of the GPIO header for the ground connection. The sensor's black wire connects to pin 8 (or any input of your choice -- configure your software to match.) The black wire/Pin 8 also needs to connect to a resistor (2200 - 4700 ohm is fine) and the other side of that resistor connects to pin 1 (3.3 V) of the Raspberry Pi GPIO connector. The black wire in the sensor provides an open-drain output, which means that it can provide a ground-level signal to pin 8 in one state, but to provide a voltage to pin 8 in the other state, you need to use the resistor (pull-up resistor) that connects to the Pi's 3.3V The Raspberry Pi inputs cannot tolerate more than 3.3 volts on an input pin. The specifications state that it has an NPN transistor output, and that configuration would be called open-collector, which in this application, works the same as the open drain output on what is clearly a FET: The on-state (conducting) voltage drop from black to blue wire was measured at about 20 millivolts. ### ⭐⭐⭐⭐⭐ Review *by W***M on 27 November 2023* It requires a magnetic field to change state. If a magnetic field is not involved -- NO WORKY PEOPLE! Magnets work well! ### ⭐⭐⭐⭐ Review *by C***Z on 30 August 2019* I like these sensors because they are sealed hall effect sensors. The cylindrical shape makes them easy to mount with just a drill. They respond to the south pole of a magnet. However, if you need to interface them to 3V logic, you need to level shift, current limit, or use a blocking diode. --- ## 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.sk/products/567544725-hiletgo-2pcs-njk-5002c-hall-effect-sensor-proximity-switch-npn](https://www.desertcart.sk/products/567544725-hiletgo-2pcs-njk-5002c-hall-effect-sensor-proximity-switch-npn) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-06-08*