{"product_id":"a3144-hall-effect-sensor-module-unipolar-magnetic-switch","title":"A3144 Hall Effect Sensor Module – Unipolar Magnetic Switch","description":"\u003ch1\u003eA3144 Hall Effect Sensor Module – Unipolar Magnetic Switch for Position and Speed Sensing\u003c\/h1\u003e\n\n\u003cp\u003eThe A3144 Hall Effect Sensor Module is a digital magnetic switch built around the A3144 unipolar Hall effect IC. It detects the presence of a magnetic South pole and outputs a logic low signal. This makes it ideal for non-contact position sensing, RPM measurement, and proximity detection in robotics and automation projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIC\u003c\/td\u003e\n\u003ctd\u003eA3144\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eUnipolar Hall Effect Sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003ctd\u003eDigital, active low (0V when South pole detected)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e4.5V – 24V DC (module typically operated at 5V)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eQuiescent Current\u003c\/td\u003e\n\u003ctd\u003e~10 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e15 mm × 10 mm (approx.)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBicycle or motor RPM counter using a magnet on the wheel\u003c\/li\u003e\n  \u003cli\u003eMagnetic door or window open\/close sensor for security systems\u003c\/li\u003e\n  \u003cli\u003eLimit switch replacement in CNC machines or 3D printers\u003c\/li\u003e\n  \u003cli\u003eProximity detector to trigger actions when a magnet comes near\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis module works directly with any microcontroller that has 5V tolerant digital inputs, such as Arduino Uno, Mega, and Nano. It can also be used with 3.3V boards like ESP32, ESP8266, or Raspberry Pi Pico if you add a level shifter or voltage divider on the output to avoid overvoltage on the GPIO pin.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 5V, GND to ground, and OUT to a digital input pin. The module includes an onboard pull-up resistor on the open-collector output, so no external components are needed. For 3.3V systems, power the module from 5V and use a 10kΩ\/20kΩ voltage divider on the OUT pin to step the signal down to 3.3V.\u003c\/p\u003e\n\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\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes, it works without additional components. Wire VCC to 5V, GND to GND, and OUT to any digital pin. The onboard pull-up ensures a clean high signal when no magnet is present.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow close does the magnet need to be?\u003c\/summary\u003e\u003cp\u003eDetection distance varies with magnet strength. A typical neodymium disc magnet (10×3 mm) triggers the sensor from 5–10 mm away. For reliable operation, mount the magnet within this range.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use this with a 3.3V microcontroller?\u003c\/summary\u003e\u003cp\u003eYes, but with caution. Power the module at 5V and use a voltage divider (e.g., 10kΩ from OUT to GPIO, 20kΩ from GPIO to GND) to step the output down to a safe 3.3V level. Do not power the module at 3.3V, as the sensor requires at least 4.5V to operate reliably.\u003c\/p\u003e\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\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445022941549,"sku":"CDN-0749","price":35.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_a1aca1aa-b5a1-4312-beb8-5d690028cc65.jpg?v=1781512882","url":"https:\/\/compoden.com\/products\/a3144-hall-effect-sensor-module-unipolar-magnetic-switch","provider":"Compoden","version":"1.0","type":"link"}