{"product_id":"m5stack-hall-unit-a3144e-magnetic-sensor-u084","title":"M5Stack Hall Unit – A3144E Magnetic Sensor | U084","description":"\u003cp\u003e\u003cvideo controls muted playsinline style=\"width:100%;height:auto;border-radius:8px;\"\u003e\u003csource src=\"https:\/\/m5stack.oss-cn-shenzhen.aliyuncs.com\/video\/Product_example_video\/Unit\/HALL_Unit.mp4\" type=\"video\/mp4\"\u003e\u003c\/video\u003e\u003c\/p\u003e\u003cp\u003eThe M5Stack Hall Unit detects a nearby magnet without mechanical contact, making it useful for door, lid, position, wheel-pulse, and rotational-event sensing. Three A3144E unipolar Hall switches feed onboard 74HC08D logic and produce a low-active digital output with a red indicator LED. Reliable operation depends on magnet pole orientation, alignment, enclosure material, and installed switching distance, so the final mechanism should be tested before thresholds or safety-related actions are assigned.\u003c\/p\u003e\u003ch2\u003eDetect Magnetic Position with the M5Stack Hall Unit\u003c\/h2\u003e\u003ch3\u003eSense a Magnet with Three A3144E Switches\u003c\/h3\u003e\u003cp\u003eThe three unipolar Hall switches provide a contactless digital detection state when the correct magnetic pole approaches.\u003c\/p\u003e\u003ch3\u003eRead a Low-Active Digital Output\u003c\/h3\u003e\u003cp\u003eThe onboard logic combines the sensor state into a low-level active output for a host GPIO.\u003c\/p\u003e\u003ch3\u003eVerify Magnet Orientation and Installed Distance\u003c\/h3\u003e\u003cp\u003eUse the supplied magnet and test the complete mechanical travel because pole direction, alignment, and mounting affect switching.\u003c\/p\u003e\u003ch2\u003eWhat You Can Build with M5Stack Hall Unit\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDoor and lid detection\u003c\/li\u003e\n\u003cli\u003eContactless position switches\u003c\/li\u003e\n\u003cli\u003eWheel-speed pulse detection\u003c\/li\u003e\n\u003cli\u003eRotational event counting\u003c\/li\u003e\n\u003cli\u003eMagnetic proximity sensing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eIntegration and Workflow\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003eMount the magnet and sensor so the correct pole approaches the intended face.\u003c\/li\u003e\n\u003cli\u003eConnect the Grove cable to a compatible digital input and confirm the low-active logic.\u003c\/li\u003e\n\u003cli\u003eMove the mechanism through its full travel and verify switching after final enclosure assembly.\u003c\/li\u003e\n\u003cli\u003eApply debounce or stable-state timing before logging or acting on each transition.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch2\u003eDeployment Notes\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eThe S pole should approach the front, or the N pole should approach the rear.\u003c\/li\u003e\n\u003cli\u003eSwitching distance varies with magnet strength, alignment, enclosure material, and temperature.\u003c\/li\u003e\n\u003cli\u003eThe output indicates magnetic proximity; it does not measure field strength.\u003c\/li\u003e\n\u003cli\u003eThe unit is not a certified guard switch or safety interlock.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDevelopment Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.m5stack.com\/en\/products\/sku\/U084\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eM5Stack U084 Documentation\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/uiflow2.m5stack.com\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eM5Stack UiFlow2 Development Environment\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.arduino.cc\/software\/ide\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eArduino IDE Documentation\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LogicBoundless","offers":[{"title":"Default Title","offer_id":49240338432215,"sku":"LB-M5-U084","price":8.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/8952\/2135\/files\/1_dce1afae-e774-4ea9-87e5-60529298deb2.jpg?v=1783243268","url":"https:\/\/logicboundless.com\/products\/m5stack-hall-unit-a3144e-magnetic-sensor-u084","provider":"LogicBoundless","version":"1.0","type":"link"}