{"id":292,"date":"2014-06-06T16:21:12","date_gmt":"2014-06-06T16:21:12","guid":{"rendered":"http:\/\/www.thinkering.de\/cms\/?p=292"},"modified":"2017-02-20T08:19:34","modified_gmt":"2017-02-20T08:19:34","slug":"arduino-7x20-led-matrix-marquee","status":"publish","type":"post","link":"http:\/\/www.thinkering.de\/cms\/?p=292","title":{"rendered":"Arduino 7&#215;20 LED Matrix Marquee"},"content":{"rendered":"<p>with serial interface and therefore Bluetooth capability \ud83d\ude42<br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\nThe circuit diagram for the Marquee can be found <a href=\"http:\/\/www.avrprojects.net\/images\/dot_matrix_display_sch.jpg\" title=\"here\" class=\"external external_icon\" rel=\"nofollow\">here<\/a><br \/>\nI&#8217;ve adapted some Arduino code discussed in the forum (see code below) to work with this device and added a serial interface. The rows are adressed directly via a ULN2003 chip and the colums are adressed through 74HC595 shift registers. The code multiplexes the rows and therefore has less flickering. The device uses a total of 10 microcontroller pins (1 per row and 3 for all the shift registers).<br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\nHere&#8217;s the project in its compact version with an Atmega328 (arduino bootloader) and a 5V Voltage regulator.<br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<a href=\"http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/matrixboard.jpg\"><img loading=\"lazy\" src=\"http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/matrixboard-300x225.jpg\" alt=\"matrixboard\" width=\"300\" height=\"225\" class=\"alignnone size-medium wp-image-293\" srcset=\"http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/matrixboard-300x225.jpg 300w, http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/matrixboard-1024x768.jpg 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>with serial interface and therefore Bluetooth capability \ud83d\ude42 The circuit diagram for the Marquee can be found here I&#8217;ve adapted some Arduino code discussed in the forum (see code below) to work with this device and added a serial interface. The rows are adressed directly via a ULN2003 chip and the colums are adressed through &hellip; <a href=\"http:\/\/www.thinkering.de\/cms\/?p=292\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Arduino 7&#215;20 LED Matrix Marquee<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/posts\/292"}],"collection":[{"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=292"}],"version-history":[{"count":5,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/posts\/292\/revisions"}],"predecessor-version":[{"id":924,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/posts\/292\/revisions\/924"}],"wp:attachment":[{"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=292"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}