{"id":1292,"date":"2015-05-30T04:10:47","date_gmt":"2015-05-30T08:10:47","guid":{"rendered":"http:\/\/commons.pratt.edu\/open-source\/?p=517"},"modified":"2015-05-30T04:10:47","modified_gmt":"2015-05-30T08:10:47","slug":"74hc595-serial-arduino-display","status":"publish","type":"post","link":"https:\/\/www.kornequipped.com\/blog\/?p=1292","title":{"rendered":"74HC595 Shift Register Arduino Display"},"content":{"rendered":"\n<p>I got this display&nbsp; by mistake. I was buying a bunch of the MAX7219 displays and mistakenly added this one to the cart too.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/es.pratt.edu\/Commons\/Images\/arduino\/8-digit.jpg\" alt=\"\" \/><\/figure>\n\n\n\n<p>MAX7219 have internal multiplexing these 74HC595 ones need external multiplexing code. I&#8217;m no stranger to that since I have done it for Futaba displays. The schematic looks simple enough&#8230;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/es.pratt.edu\/Commons\/Images\/arduino\/8-digit-1.jpg\" alt=\"\" \/><\/figure>\n\n\n\n<p>At least it was only $2 lost. Returning it would cost more so I tried to make it work. I checked the Arduino forum and all the posted solutions did not work. I cobbled this test program together from all those posts and revised the display mapping to make it work.<\/p>\n\n\n\n<p>I probably wont use it since it takes too much processing power to update it but it does work. I&#8217;ll leave it in the PDL for someone else to play with.<\/p>\n\n\n\n<p>Here&#8217;s the code:<\/p>\n\n\n\n<p>https:\/\/github.com\/rjkorn\/Cheapie_8x7_Segment_Display<\/p>\n\n\n\n<p>Now if someone wants to make an interrupt driven library that would be nice&#8230;. Just not me&#8230;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I got this display&nbsp; by mistake. I was buying a bunch of the MAX7219 displays and mistakenly added this one to the cart too. MAX7219 have internal multiplexing these 74HC595 ones need external multiplexing code. I&#8217;m no stranger to that since I have done it for Futaba displays. The schematic looks simple enough&#8230; At least [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1292","post","type-post","status-publish","format-standard","hentry","category-arduino"],"_links":{"self":[{"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1292"}],"version-history":[{"count":0,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1292\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}