{"id":780,"date":"2018-12-19T14:21:16","date_gmt":"2018-12-19T21:21:16","guid":{"rendered":"http:\/\/kjcrr.org\/?page_id=780"},"modified":"2020-05-15T22:04:23","modified_gmt":"2020-05-16T04:04:23","slug":"mqtt-wifi-rfid-reader","status":"publish","type":"page","link":"https:\/\/kjcrr.org\/?page_id=780","title":{"rendered":"MQTT WiFi RFID Reader"},"content":{"rendered":"<p>The design is very simple it is based on a ESP8266 development board like:<br \/>\n<img decoding=\"async\" src=\"https:\/\/kjcrr.org\/wp-content\/uploads\/2018\/12\/ESP8266dev.png\" alt=\"ESP8266 Development Board\"><br \/>\nThe circuit has a very few components:<\/p>\n<ul>\n<li>J1 &#8211; a 3 contact terminal strip for power and the output from the RFID reader<\/li>\n<li>R1 &#8211; a 3.3K 1\/4 watt resistor<\/li>\n<li>R2 &#8211; a 6.8K 1\/4 watt resistor, R1 and R2 protect the input of the ESP8266, which uses 3.3v, from the RFID reader, which uses 5v<\/li>\n<li>U1 &#8211; the ESP8266 component<\/li>\n<\/ul>\n<p>The follow schematic shows the circuit<br \/>\n<img decoding=\"async\" src=\"https:\/\/kjcrr.org\/wp-content\/uploads\/2018\/12\/circuit.png\" alt=\"circuit schematic\">. The PCB design can be found in <a href=\"https:\/\/github.com\/djbristow\/RAILS-HW\" target=\"_blank\" rel=\"noopener noreferrer\">my GitHub repository<\/a><br \/>\nThe source code for the ESP8266 can be found in the microcontroller folder of <a href=\"https:\/\/github.com\/djbristow\/RAILS-Micro\" target=\"_blank\" rel=\"noopener noreferrer\">my GitHub repository<\/a><br \/>\nAt this time the code supports either a ID12LA_Reader or a 7491E_Reader.<br \/>\nThe finished project<br \/>\n<img decoding=\"async\" src=\"https:\/\/kjcrr.org\/wp-content\/uploads\/2020\/04\/IMG_1229.png\" target=\"_blank\" rel=\"noopener noreferrer\"><\/p>\n<h3>RFID Components<\/h3>\n<li><a href=\"https:\/\/www.sparkfun.com\/products\/11827\" target=\"_blank\" rel=\"noopener noreferrer\">RFID Reader ID-12LA (125 kHz)<\/a><\/li>\n<li><a href=\"https:\/\/www.aliexpress.com\/item\/32831988522.html?spm=a2g0s.9042311.0.0.27424c4dT9ikSd\" target=\"_blank\" rel=\"noopener noreferrer\">RFID 7491E_Reader (125 kHz)<\/a><\/li>\n<li><a href=\"https:\/\/www.aliexpress.com\/item\/32469441553.html?spm=a2g0s.9042311.0.0.27424c4dT9ikSd\" target=\"_blank\" rel=\"noopener noreferrer\">ESP8266 CH340G NodeMcu V3 Lua Wireless WiFi Module<\/a><\/li>\n<li><a href=\"https:\/\/www.aliexpress.com\/item\/32809920087.html?spm=\" target=\"_blank\" rel=\"noopener noreferrer\">RFID glass tags<\/a><\/li>\n<li><a href=\"https:\/\/www.aliexpress.com\/item\/4000074664594.html?spm=a2g0o.productlist.0.0.17a242427R5yoK&#038;algo_pvid=847a7903-962f-48eb-a772-ac7483e107e3&#038;algo_expid=847a7903-962f-48eb-a772-ac7483e107e3-44&#038;btsid=434600fe-a55a-4cf0-b0ae-f5fc9dc21efd&#038;ws_ab_test=searchweb0_0,searchweb201602_1,searchweb201603_53\" target=\"_blank\" rel=\"noopener noreferrer\">RFID coin tags<\/a><\/li>\n<\/ul>\n<\/li>\n","protected":false},"excerpt":{"rendered":"<p>The design is very simple it is based on a ESP8266 development board like: The circuit has a very few components: J1 &#8211; a 3 contact terminal strip for power and the output from the RFID reader R1 &#8211; a 3.3K 1\/4 watt resistor R2 &#8211; a 6.8K 1\/4 watt resistor, R1 and R2 protect\u2026 <span class=\"read-more\"><a href=\"https:\/\/kjcrr.org\/?page_id=780\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":768,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-templates\/full-width.php","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-780","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/kjcrr.org\/index.php?rest_route=\/wp\/v2\/pages\/780","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kjcrr.org\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/kjcrr.org\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/kjcrr.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kjcrr.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=780"}],"version-history":[{"count":11,"href":"https:\/\/kjcrr.org\/index.php?rest_route=\/wp\/v2\/pages\/780\/revisions"}],"predecessor-version":[{"id":1046,"href":"https:\/\/kjcrr.org\/index.php?rest_route=\/wp\/v2\/pages\/780\/revisions\/1046"}],"up":[{"embeddable":true,"href":"https:\/\/kjcrr.org\/index.php?rest_route=\/wp\/v2\/pages\/768"}],"wp:attachment":[{"href":"https:\/\/kjcrr.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=780"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}