{"id":826,"date":"2020-10-13T14:26:37","date_gmt":"2020-10-13T18:26:37","guid":{"rendered":"https:\/\/dc540.org\/xxx\/?p=826"},"modified":"2020-10-13T14:28:17","modified_gmt":"2020-10-13T18:28:17","slug":"further-rfid-reader-explorations","status":"publish","type":"post","link":"https:\/\/dc540.org\/xxx\/2020\/10\/further-rfid-reader-explorations\/","title":{"rendered":"Further RFID Reader Explorations"},"content":{"rendered":"\n<p>Last night I successfully modified my RFID Arduino demonstration code to use the MFRC522 chip, by way of the RFID-RC522 module which was included with my CrowPi.  Thanks, CrowPi!<\/p>\n\n\n\n<p>The whole point of all of this exploration is for possible use in #badgelife, and the MFRC522 is a sea change from the commercial RFID reader in my last post. I&#8217;m not saying interfacing the Arduino with commercial readers isn&#8217;t useful, there are probably a number of people out there interested in DIY physical access control at a DIY-friendly price point. In fact, I found an electromagnetic cabinet lock for $6 from China! <\/p>\n\n\n\n<p><a href=\"https:\/\/www.newegg.com\/p\/0X6-04KT-2B699?Description=magnetic%20door%20locks&amp;cm_re=magnetic_door%20locks--0X6-04KT-2B699--Product\">https:\/\/www.newegg.com\/p\/0X6-04KT-2B699?Description=magnetic%20door%20locks&amp;cm_re=magnetic_door%20locks&#8211;0X6-04KT-2B699&#8211;Product<\/a><\/p>\n\n\n\n<p>But now that that point has been made, we&#8217;re on to exploring other creative uses.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Most importantly, the MFRC522 reads HF (13.56MHz) MIFARE tags rather than LF (125KHz) tags. This changes the game a little bit.  It allows us to scan hotel room keys, which from my explorations are ALL HF tags nowadays, and the vast majority are MIFARE.  <\/li><li>LF reader chips are more expensive and less available &#8212; generally&#8230;<\/li><li>Due to the size of the wavelength (125KHz LF wavelength is ~2400m, while 13.56MHz HF wavelength is more along the lines of 22m), it seems like it&#8217;s WAY easier to design a PCB-printed antenna for HF than LF. <\/li><\/ol>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Last night I successfully modified my RFID Arduino demonstration code to use the MFRC522 chip, by way of the RFID-RC522 module which was included with my CrowPi. Thanks, CrowPi! The &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/dc540.org\/xxx\/2020\/10\/further-rfid-reader-explorations\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Further RFID Reader Explorations&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":827,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5,73],"tags":[],"class_list":["post-826","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardware","category-rfid"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/dc540.org\/xxx\/wp-content\/uploads\/2020\/10\/rfid-rc522.jpg","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/posts\/826","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/comments?post=826"}],"version-history":[{"count":2,"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/posts\/826\/revisions"}],"predecessor-version":[{"id":829,"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/posts\/826\/revisions\/829"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/media\/827"}],"wp:attachment":[{"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/media?parent=826"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/categories?post=826"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dc540.org\/xxx\/wp-json\/wp\/v2\/tags?post=826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}