{"product_id":"a3144-hall-effect-sensor-unipolar-switch-for-magnetic-sensing","title":"A3144 Hall Effect Sensor – Unipolar Switch for Magnetic Sensing","description":"\u003ch1\u003eA3144 Unipolar Hall Effect Sensor – Magnetic Digital Switch\u003c\/h1\u003e\n\u003cp\u003eThe A3144 is a unipolar Hall effect switch that senses magnetic fields and provides a digital output. It is widely used in contactless switching, position detection, and speed measurement applications. Its open-collector output and wide operating voltage make it easy to integrate with microcontrollers and embedded systems.\u003c\/p\u003e\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e4.5 V to 24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eDigital (open-collector sinking)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensing Magnetic Polarity\u003c\/td\u003e\n\u003ctd\u003eSouth pole only (unipolar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical Operate Flux (Bop)\u003c\/td\u003e\n\u003ctd\u003e35 mT (350 Gauss)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Output Current\u003c\/td\u003e\n\u003ctd\u003e25 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eTO-92 (3‑pin)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eContactless magnetic door\/window open‑close detector\u003c\/li\u003e\n\u003cli\u003eRPM counter for motors and rotating shafts\u003c\/li\u003e\n\u003cli\u003eProximity sensor for limit switches in automation\u003c\/li\u003e\n\u003cli\u003eSpeedometer or odometer for bicycle or robotics projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe A3144 works directly with any 5 V microcontroller including Arduino Uno, Nano, and Mega. It also functions with 3.3 V boards like ESP32 or Raspberry Pi Pico when using a pull‑up resistor to the respective voltage rail. A small neodymium magnet (south pole facing the branded side) is all that’s needed for activation.\u003c\/p\u003e\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect Vcc to 3.3–5 V, GND to ground, and the output (pin 2) to a digital input through a 10 kΩ pull‑up resistor. When a south‑pole magnet is brought near the sensor’s face, the output goes low. Many pre‑built modules already include the resistor and a status LED.\u003c\/p\u003e\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\n\u003cp\u003eYes, the A3144 outputs a digital signal that Arduino reads directly. Power it from the 5 V pin and connect the output to any digital I\/O with an external or onboard pull‑up resistor.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat type of magnet should I use?\u003c\/summary\u003e\n\u003cp\u003eUse a standard neodymium disc magnet with the south pole facing the sensor’s labelled side. North‑pole magnets will not trigger the output.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eDoes this sensor need a pull‑up resistor?\u003c\/summary\u003e\n\u003cp\u003eThe bare A3144 has an open‑collector output that requires an external pull‑up resistor (10 kΩ is typical). Complete sensor modules usually include this resistor and an indicator LED.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top: 24px; padding: 16px; background: #f0f4ff; border-left: 4px solid #2B4D8F; border-radius: 4px;\"\u003e\n\u003cp style=\"margin: 0 0 6px 0; font-weight: 600; color: #1a3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 0.95em; color: #333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53444960485741,"sku":"CDN-0381","price":10.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/download_847acba8-1a1e-4a2f-b2d6-8162cf21c744.jpg?v=1781523251","url":"https:\/\/compoden.com\/products\/a3144-hall-effect-sensor-unipolar-switch-for-magnetic-sensing","provider":"Compoden","version":"1.0","type":"link"}