{"id":52647,"date":"2017-04-10T23:20:36","date_gmt":"2017-04-10T22:20:36","guid":{"rendered":"https:\/\/www.microplanet.ma\/?post_type=product&#038;p=52647"},"modified":"2026-10-19T16:35:49","modified_gmt":"2026-10-19T16:35:49","slug":"ky-025-reed-magnetic-switch-module","status":"publish","type":"product","link":"https:\/\/www.microplanet.ma\/en\/produit\/ky-025-reed-magnetic-switch-module\/","title":{"rendered":"KY-025 Reed Magnetic Switch Module"},"content":{"rendered":"<h3>KY-025 Reed Magnetic Switch Module<\/h3>\n<p>The KY-025 uses a reed switch that is activated when a magnetic field is applied. This module is suitable for proximity detection, security and contactless control applications.<\/p>\n<h4>Detailed specifications<\/h4>\n<ul>\n<li><strong>Operating voltage:<\/strong> 3.3\u20135 V DC<\/li>\n<li><strong>Output:<\/strong> Digital (open\/closed circuit)<\/li>\n<li><strong>Dimensions:<\/strong> 22 \u00d7 15 \u00d7 7 mm<\/li>\n<li><strong>Weight:<\/strong> 5 g<\/li>\n<li><strong>Main components:<\/strong> Reed switch, LM393 comparator, sensitivity-adjustment potentiometer, LED and resistors<\/li>\n<\/ul>\n<h4>How it works<\/h4>\n<p>The reed switch on the KY-025 closes when a magnet is nearby, creating a closed circuit. The onboard comparator provides a digital output when the magnetic field exceeds the threshold adjusted with the potentiometer.<\/p>\n<h4>Applications<\/h4>\n<ul>\n<li>Security and alarm systems<\/li>\n<li>Proximity detection for doors and windows<\/li>\n<li>Liquid-level sensors<\/li>\n<li>Contactless-control projects<\/li>\n<li>Interactive art installations<\/li>\n<\/ul>\n<h4>Pinout<\/h4>\n<p>The KY-025 module has three pins:<\/p>\n<ol>\n<li><strong>VCC:<\/strong> Power supply (3.3\u20135 V)<\/li>\n<li><strong>GND:<\/strong> Ground<\/li>\n<li><strong>D0:<\/strong> Digital output<\/li>\n<\/ol>\n<h4>How to use it<\/h4>\n<p>Connect the KY-025 reed module as follows:<\/p>\n<ol>\n<li><strong>VCC<\/strong> to 5 V on the Arduino<\/li>\n<li><strong>GND<\/strong> to GND on the Arduino<\/li>\n<li><strong>D0<\/strong> to a digital pin (for example, D3) to read the digital values<\/li>\n<\/ol>\n<h4>Using it with an Arduino Uno<\/h4>\n<h5>Basic Arduino code example<\/h5>\n<div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-cpp\" data-lang=\"C++\"><code>const int led = 13; \/\/ LED sur l'Arduino\r\nconst int digitalPin = 3; \/\/ Interface num\u00e9rique du capteur Reed\r\nint digitalVal; \/\/ Valeurs num\u00e9riques\r\n\r\n\r\nvoid setup() {\r\n\u00a0 pinMode(led, OUTPUT);\r\n\u00a0 pinMode(digitalPin, INPUT);\r\n\u00a0 Serial.begin(9600);\r\n}\r\n\r\n\r\nvoid loop() {\r\n\u00a0 \/\/ Lecture de l'interface num\u00e9rique\r\n\u00a0 digitalVal = digitalRead(digitalPin);\r\n\u00a0 if (digitalVal == HIGH) {\r\n\u00a0 \u00a0 digitalWrite(led, HIGH);\r\n\u00a0 \u00a0 Serial.println(\"Magnet detected\");\r\n\u00a0 } else {\r\n\u00a0 \u00a0 digitalWrite(led, LOW);\r\n\u00a0 \u00a0 Serial.println(\"No magnet\");\r\n\u00a0 }\r\n\u00a0 delay(100);\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n<p><strong>What the code does:<\/strong> It reads the KY-025 digital output, turns on the Arduino LED when a magnetic field is detected, and displays the status in the serial monitor.<\/p>\n<h5>Components required for the basic example<\/h5>\n<ul>\n<li>Arduino Uno<\/li>\n<li>KY-025 module<\/li>\n<li>Connecting wires<\/li>\n<\/ul>\n<h5>Basic code explained<\/h5>\n<ol>\n<li><strong>Pin initialization:<\/strong> The LED pin is set as an output and the sensor pin as an input.<\/li>\n<li><strong>Reading and displaying data:<\/strong> The sensor\u2019s digital value is read and displayed in the serial monitor. The LED turns on when a magnetic field is detected.<\/li>\n<\/ol>\n<h5>Basic wiring<\/h5>\n<ul>\n<li><strong>VCC (KY-025):<\/strong> 5 V (Arduino)<\/li>\n<li><strong>GND (KY-025):<\/strong> GND (Arduino)<\/li>\n<li><strong>D0 (KY-025):<\/strong> D3 (Arduino)<\/li>\n<\/ul>\n<h5>Advanced Arduino code example<\/h5>\n<div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-cpp\" data-lang=\"C++\"><code>#include &lt;Wire.h&gt;\r\n#include &lt;LiquidCrystal_I2C.h&gt;\r\n\r\n\r\nLiquidCrystal_I2C lcd(0x27, 16, 2);\r\nconst int led = 13;\r\nconst int digitalPin = 3;\r\nint digitalVal;\r\n\r\n\r\nvoid setup() {\r\n\u00a0 lcd.begin();\r\n\u00a0 lcd.backlight();\r\n\u00a0 pinMode(led, OUTPUT);\r\n\u00a0 pinMode(digitalPin, INPUT);\r\n\u00a0 Serial.begin(9600);\r\n}\r\n\r\n\r\nvoid loop() {\r\n\u00a0 digitalVal = digitalRead(digitalPin);\r\n\u00a0 if (digitalVal == HIGH) {\r\n\u00a0 \u00a0 digitalWrite(led, HIGH);\r\n\u00a0 \u00a0 lcd.setCursor(0, 0);\r\n\u00a0 \u00a0 lcd.print(\"Magnetic: YES \");\r\n\u00a0 \u00a0 Serial.println(\"Magnet detected\");\r\n\u00a0 } else {\r\n\u00a0 \u00a0 digitalWrite(led, LOW);\r\n\u00a0 \u00a0 lcd.setCursor(0, 0);\r\n\u00a0 \u00a0 lcd.print(\"Magnetic: NO\u00a0 \");\r\n\u00a0 \u00a0 Serial.println(\"No magnet\");\r\n\u00a0 }\r\n\u00a0 delay(100);\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n<p><strong>What the code does:<\/strong> It reads the KY-025 digital output, displays it on an I2C LCD, controls the Arduino LED and reports the status in the serial monitor.<\/p>\n<h5>Components required for the advanced example<\/h5>\n<ul>\n<li>Arduino Uno<\/li>\n<li>KY-025 module<\/li>\n<li>1602 I2C LCD<\/li>\n<li>Connecting wires<\/li>\n<\/ul>\n<h5>Advanced code explained<\/h5>\n<ol>\n<li><strong>Including libraries:<\/strong> <code>#include &lt;Wire.h&gt;<\/code> and <code>#include &lt;LiquidCrystal_I2C.h&gt;<\/code> add the libraries required for the LCD.<\/li>\n<li><strong>Initialization:<\/strong> Communication with the LCD and sensor is set up in <code>setup()<\/code>.<\/li>\n<li><strong>Reading and displaying data:<\/strong> The digital value is read and displayed on the LCD. The LED turns on when a magnetic field is detected.<\/li>\n<\/ol>\n<h5>Advanced wiring<\/h5>\n<ul>\n<li><strong>VCC (KY-025):<\/strong> 5 V (Arduino)<\/li>\n<li><strong>GND (KY-025):<\/strong> GND (Arduino)<\/li>\n<li><strong>D0 (KY-025):<\/strong> D3 (Arduino)<\/li>\n<li><strong>VCC (LCD):<\/strong> 5 V (Arduino)<\/li>\n<li><strong>GND (LCD):<\/strong> GND (Arduino)<\/li>\n<li><strong>SCL (LCD):<\/strong> A5 (Arduino)<\/li>\n<li><strong>SDA (LCD):<\/strong> A4 (Arduino)<\/li>\n<\/ul>\n<h4>Installing the driver\/library<\/h4>\n<p>To use the KY-025 module and LCD with Arduino, install the LiquidCrystal I2C library through the Arduino IDE:<\/p>\n<ol>\n<li><strong>Open the Arduino IDE:<\/strong> Make sure you are using a recent version.<\/li>\n<li><strong>Open the Library Manager:<\/strong> From the menu, choose Sketch \u2192 Include Library \u2192 Manage Libraries.<\/li>\n<li><strong>Search for \u201cLiquidCrystal I2C\u201d:<\/strong> Use the search box to find the library.<\/li>\n<li><strong>Install the library:<\/strong> Click Install to add it to your IDE.<\/li>\n<\/ol>\n<p><span style=\"font-size: 8pt\">Keywords: switch, magnetic, sensor, reed switch, KY-025, Arduino, magnetic detection, sensor module.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The KY-025 uses a reed switch that closes when a magnet is nearby. Its digital output is useful for proximity detection, security and contactless control.<\/p>\n","protected":false},"featured_media":52648,"template":"","meta":[],"product_brand":[],"product_cat":[314,316],"product_tag":[],"class_list":["post-52647","product","type-product","status-publish","has-post-thumbnail","product_cat-developpement-en","product_cat-modules-capteurs-en","first","instock","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>KY-025 Reed Magnetic Switch Module | MicroPlanet<\/title>\n<meta name=\"description\" content=\"KY-025 magnetic reed switch module with digital output, LM393 comparator and adjustable sensitivity.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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