{"id":916,"date":"2025-08-30T10:14:02","date_gmt":"2025-08-30T08:14:02","guid":{"rendered":"https:\/\/www.yelloworb.com\/orbblog\/?p=916"},"modified":"2025-08-30T10:14:54","modified_gmt":"2025-08-30T08:14:54","slug":"mm-radar-in-home-assistant","status":"publish","type":"post","link":"https:\/\/www.yelloworb.com\/orbblog\/mm-radar-in-home-assistant\/","title":{"rendered":"mm radar in Home Assistant"},"content":{"rendered":"\n

Hi-Link<\/a> manufactures a number of different sensor modules with millimeter wavelength radars<\/a> which are great to detect humans with.<\/p>\n\n\n\n

Some time ago I read about these and they were did not cost much. I bought these from AliExpress. So I ordered some different ones. Recently I found some time to experiment with one of them, the LD2450<\/a> (The AliExpress item<\/a> I bought). On the product page there is a link to a Google drive with documents<\/a> and software for this module. <\/p>\n\n\n\n

I had previously tried one of the others briefly but unsuccessfully. So this time I took a bit different path.<\/p>\n\n\n\n

I read that several (maybe all?) of these has built in Bluetooth so I downloaded the HLKRadarTool (iOS <\/a>or Android<\/a>) to my phone and powered up the module and connected the phone to it. It worked directly and it was easy to evaluate how the device performed.<\/p>\n\n\n\n

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Once I know it worked well it was time to connect it to an ESP32. The manual<\/a> made it easy to understand what pins to use on the radar module. I had some ESP32-C3<\/a> modules at home so I decided to use it. The model I had was Tenstar Robot Super Mini<\/a> and the pinout <\/a>made it easy to figure out how to connect RX and TX on the sensor to TX and RX on the ESP32.<\/p>\n\n\n\n

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I then used ESPHome device builder<\/a> in Home Assistant<\/a> and the information on the ESPHome LD2450 page<\/a> to create and install a configuration for the sensor. And soon it appeared in Home Assistant.<\/p>\n\n\n\n

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After that I looked for a case and found a nice simple case<\/a> that could easily be pointed in different directions but was not too bulky.<\/p>\n\n\n\n

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Hi-Link manufactures a number of different sensor modules with millimeter wavelength radars which are great to detect humans with. Some time ago I read about these and they were did not cost much. I bought these from AliExpress. So I ordered some different ones. Recently I found some time to experiment with one of them, […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[29,86],"tags":[],"class_list":["post-916","post","type-post","status-publish","format-standard","hentry","category-hardware-projects","category-home-assistant"],"_links":{"self":[{"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/posts\/916","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/comments?post=916"}],"version-history":[{"count":2,"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/posts\/916\/revisions"}],"predecessor-version":[{"id":922,"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/posts\/916\/revisions\/922"}],"wp:attachment":[{"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/media?parent=916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/categories?post=916"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yelloworb.com\/orbblog\/wp-json\/wp\/v2\/tags?post=916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}