{"product_id":"door-opening-alarm-hall-sensor","title":"Door Opening Alarm (Hall Sensor)","description":"This \u003cstrong\u003esimple Kit door-opening alarm\u003c\/strong\u003e uses a hall sensor to produce sound when someone opens the door. The circuit can be installed at a workshop, office, or home for security purposes. The \u003cstrong\u003e3-terminal hall sensor\u003c\/strong\u003e is easily available in the market. When the door is closed, neither the buzzer sounds nor LED glows. But when the door is opened, the buzzer sounds and LED glows. \u003cbr\u003e\u003cbr\u003e \u003cstrong\u003eHall sensor MH183\u003c\/strong\u003e is a magnet-operated solid-state sensor. When the magnet is brought near the sensor, its output goes low. This low output is amplified by the NPN transistor. NPN transistor inverts the operation. The magnet should be fitted on the moving part of the door and the sensor at the door frame. When the door is closed, the magnet comes close to the sensor and the alarm is off. But when the door is opened, the alarm makes a sound. The\u003cstrong\u003e Door Opening Alarm Sensor\u003c\/strong\u003e buzzer can be replaced with a 5V relay to control a mains alarm. \u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eBlock Diagram\u003c\/h3\u003e\n\u003cdiv id=\"p_info\" style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/files\/Door-opening-alarm.jpg?v=1633521485\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 20 x 15 x 5\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 200\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/RMa_2M88_gQ\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/6rmErwU5E-k\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/Fp37DPZVdRI\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF","offer_id":40708890624181,"sku":"LGKT123","price":349.0,"currency_code":"INR","in_stock":true},{"title":"READY TO USE","offer_id":40708890656949,"sku":"LGKT123_R","price":499.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/door-opening-alarm-mini-project.jpg?v=1633521700","url":"https:\/\/kitsguru.com\/fr\/products\/door-opening-alarm-hall-sensor","provider":"KitsGuru","version":"1.0","type":"link"}