{"product_id":"ky-025-reed-switch-sensor-module-with-adjustable-digital-and-analog-output-magnetic-detection-module-for-arduino","title":"KY-025 Reed Switch Sensor Module with Adjustable Digital and Analog Output – Magnetic Detection Module for Arduino","description":"\u003cp\u003eThe \u003cstrong\u003eKY-025 Reed Switch Module\u003c\/strong\u003e is a compact magnetic detection sensor designed for Arduino, microcontrollers and electronic automation projects. It uses a glass-encapsulated reed switch to detect the presence of a nearby magnet without requiring physical contact.\u003c\/p\u003e\n\u003cp\u003eWhen a magnet approaches the reed switch, the internal metal contacts react to the magnetic field and change the module’s output state. This makes the sensor suitable for door-position detection, security alarms, magnetic counters, limit detection, speed measurement and other contactless switching applications.\u003c\/p\u003e\n\u003cp\u003eThe module includes an \u003cstrong\u003eLM393 comparator circuit\u003c\/strong\u003e and an adjustable onboard potentiometer. The potentiometer allows the user to set the digital-output switching threshold. Two onboard indicator LEDs commonly show power status and digital-output activity. \u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe KY-025 provides both \u003cstrong\u003eanalog and digital outputs\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog output (A0):\u003c\/strong\u003e Supplies the raw reed-switch signal for monitoring through an analog input.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital output (D0):\u003c\/strong\u003e Supplies a HIGH or LOW switching signal according to the comparator setting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts four-pin interface allows easy connection to Arduino UNO, Nano, Mega, ESP32, ESP8266, Raspberry Pi GPIO circuits and other compatible development boards. The module is commonly operated from approximately \u003cstrong\u003e3.3V to 5V\u003c\/strong\u003e, although exact specifications can vary between manufacturers. \u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe sensor is useful for detecting a magnet’s presence, but it does not measure an exact magnetic-field strength or distance. Detection range depends on the size and strength of the magnet, its orientation and the surrounding installation conditions.\u003c\/p\u003e\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDoor-open and door-closed detection\u003c\/li\u003e\n\u003cli\u003eWindow security alarms\u003c\/li\u003e\n\u003cli\u003eMagnetic proximity detection\u003c\/li\u003e\n\u003cli\u003eContactless limit switches\u003c\/li\u003e\n\u003cli\u003eBicycle wheel speed measurement\u003c\/li\u003e\n\u003cli\u003eRotation and RPM counting\u003c\/li\u003e\n\u003cli\u003ePosition detection\u003c\/li\u003e\n\u003cli\u003eMagnetic counters\u003c\/li\u003e\n\u003cli\u003eSmart-home projects\u003c\/li\u003e\n\u003cli\u003eRobot position sensing\u003c\/li\u003e\n\u003cli\u003eArduino security projects\u003c\/li\u003e\n\u003cli\u003eElectronic lock monitoring\u003c\/li\u003e\n\u003cli\u003eIndustrial model projects\u003c\/li\u003e\n\u003cli\u003eDIY automation systems\u003c\/li\u003e\n\u003cli\u003eStudent science projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1 × KY-025 Reed Switch Sensor Module\u003c\/p\u003e\n\u003ch2 class=\"PDq2pG_selectionAnchorContainer\"\u003eImportant Usage Notes\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHandle the glass reed switch carefully because it can break if bent or struck.\u003c\/li\u003e\n\u003cli\u003eUse only the pin labels printed on the module when wiring it.\u003c\/li\u003e\n\u003cli\u003eDo not exceed the recommended operating voltage.\u003c\/li\u003e\n\u003cli\u003eDetection distance is not fixed and depends on magnet strength and orientation.\u003c\/li\u003e\n\u003cli\u003eAdjust the potentiometer slowly while testing the digital output.\u003c\/li\u003e\n\u003cli\u003eKeep the sensor away from high-current wires and strong unwanted magnetic fields.\u003c\/li\u003e\n\u003cli\u003eThe module detects magnetic presence; it is not a precision magnetic-field measuring instrument.\u003c\/li\u003e\n\u003cli\u003eBoard layout, component markings and PCB colour may vary depending on available stock.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MAJESTRONICZ","offers":[{"title":"Default Title","offer_id":48091003388062,"sku":null,"price":55.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0661\/9257\/2574\/files\/f59uflgs_1.png?v=1786015937","url":"https:\/\/majestronicz.in\/products\/ky-025-reed-switch-sensor-module-with-adjustable-digital-and-analog-output-magnetic-detection-module-for-arduino","provider":"MAJESTRONICZ","version":"1.0","type":"link"}