{"id":3222,"date":"2019-02-28T09:44:39","date_gmt":"2019-02-28T09:44:39","guid":{"rendered":"https:\/\/www.beaconzone.co.uk\/blog\/?p=3222"},"modified":"2019-02-28T09:44:41","modified_gmt":"2019-02-28T09:44:41","slug":"bluetooth-le-advertising-channels","status":"publish","type":"post","link":"https:\/\/www.beaconzone.co.uk\/blog\/bluetooth-le-advertising-channels\/","title":{"rendered":"Bluetooth LE Advertising Channels"},"content":{"rendered":"\n<p>Bluetooth LE works at 2.4GHz, the same frequency used for WiFi and microwave ovens! There are two main types of Bluetooth LE transmission: <a rel=\"noreferrer noopener\" aria-label=\"advertising (opens in a new tab)\" href=\"https:\/\/bluetoothle.wiki\/advertising\" target=\"_blank\">advertising<\/a> where the device only sends out data and connection-orientated using <a rel=\"noreferrer noopener\" aria-label=\"Generic Attributes (GATT) (opens in a new tab)\" href=\"https:\/\/bluetoothle.wiki\/gatt\" target=\"_blank\">Generic Attributes (GATT)<\/a> .<\/p>\n\n\n\n<p>Bluetooth LE uses frequency hopping for increased reliability when there might be noise on a particular channel. When advertising, it uses channels 37, 37 and 39. If subsequently connected, it uses other channels:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"506\" height=\"302\" src=\"https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2019\/02\/bluetoothlechannels.png\" alt=\"\" class=\"wp-image-3223\" srcset=\"https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2019\/02\/bluetoothlechannels.png 506w, https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2019\/02\/bluetoothlechannels-300x179.png 300w\" sizes=\"(max-width: 506px) 85vw, 506px\" \/><figcaption> <br>Frequency Channels from <a href=\"http:\/\/www.rfwireless-world.com\/Terminology\/BLE-Advertising-channels-and-Data-channels-list.html\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"RF Wireless-World (opens in a new tab)\">RF Wireless-World<\/a> <\/figcaption><\/figure><\/div>\n\n\n\n<p>When only advertising, the transmission is very short of the order of 1 or 2 milliseconds. In between advertising, there is no transmission which is one of the main reasons why Bluetooth LE has very low power use:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"463\" height=\"188\" src=\"https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2016\/03\/nordicadvertising.png\" alt=\"\" class=\"wp-image-190\" srcset=\"https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2016\/03\/nordicadvertising.png 463w, https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2016\/03\/nordicadvertising-300x122.png 300w\" sizes=\"(max-width: 463px) 85vw, 463px\" \/><figcaption>Power use over time<\/figcaption><\/figure><\/div>\n\n\n\n<p>Read about <a href=\"https:\/\/www.beaconzone.co.uk\/ibeaconadvertisinginterval\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Choosing an Advertising Interval (opens in a new tab)\">Choosing an Advertising Interval<\/a> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bluetooth LE works at 2.4GHz, the same frequency used for WiFi and microwave ovens! There are two main types of Bluetooth LE transmission: advertising where the device only sends out data and connection-orientated using Generic Attributes (GATT) . Bluetooth LE uses frequency hopping for increased reliability when there might be noise on a particular channel. &hellip; <a href=\"https:\/\/www.beaconzone.co.uk\/blog\/bluetooth-le-advertising-channels\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Bluetooth LE Advertising Channels&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117,4],"tags":[],"_links":{"self":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/3222"}],"collection":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=3222"}],"version-history":[{"count":5,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/3222\/revisions"}],"predecessor-version":[{"id":3264,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/3222\/revisions\/3264"}],"wp:attachment":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=3222"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=3222"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=3222"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}