{"product_id":"ky-003-hall-effect-magnetic-sensor-module-compoden","title":"KY-003 Hall Effect Magnetic Sensor Module - Compoden","description":"\u003ch1\u003eKY-003 Hall Effect Magnetic Sensor Module – Digital Output\u003c\/h1\u003e\n\n\u003cp\u003eThe KY-003 is a Hall effect sensor module that detects magnetic fields and provides a digital output. It is widely used for proximity sensing, position detection, and RPM measurement in DIY electronics and robotics. The module includes a built-in LED indicator and an adjustable potentiometer for sensitivity control.\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\u003eSensor Type\u003c\/td\u003e\n\u003ctd\u003eHall Effect (SS49E or equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003ctd\u003eDigital (TTL level, active low)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3V - 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCurrent Draw\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;10mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDetection Range\u003c\/td\u003e\n\u003ctd\u003eUp to 2cm (depends on magnet strength)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIndicator\u003c\/td\u003e\n\u003ctd\u003eRed LED (ON when magnet detected)\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\u003e\u003ca href=\"\/products\/wifi-window-alarm-and-garage-door-controller-kit-esp8266\"\u003eMagnetic door\/window alarm system\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eRPM counter for motors using a magnet on shaft\u003c\/li\u003e\n  \u003cli\u003eProximity sensor for robot obstacle detection with magnets\u003c\/li\u003e\n  \u003cli\u003eLatching switch for hidden compartments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis sensor module works with any microcontroller or single-board computer with 3.3V or 5V logic, including Arduino Uno, Nano, Mega, ESP8266, ESP32, and Raspberry Pi. It requires only one digital input pin to read the magnetic field state.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 5V (or 3.3V), GND to ground, and the digital output pin to any digital I\/O on your board. No pull-up resistor is needed as the module includes an internal pull-up. Keep magnet within 2 cm for reliable detection.\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, the KY-003 operates at 5V logic and works directly with Arduino Uno. Connect VCC to 5V, GND to GND, and the output pin to any digital pin.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use this to measure RPM?\u003c\/summary\u003e\u003cp\u003eAbsolutely. Attach a small magnet to a rotating shaft and position the sensor close to it. Each time the magnet passes, the output goes low. Count the pulses per minute to calculate RPM. Code examples are available in the Arduino community.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I adjust the detection range?\u003c\/summary\u003e\u003cp\u003eThe small trimmer potentiometer on the module can be turned clockwise to decrease sensitivity or counterclockwise to increase it. This adjusts the threshold for magnetic field strength needed to trigger the output.\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":53445016912237,"sku":"CDN-0710","price":25.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_79346bf1-e012-418e-bd0c-9bbfa1ecdbe5.jpg?v=1781512837","url":"https:\/\/compoden.com\/products\/ky-003-hall-effect-magnetic-sensor-module-compoden","provider":"Compoden","version":"1.0","type":"link"}