{"id":2344,"date":"2016-02-23T10:29:26","date_gmt":"2016-02-23T17:29:26","guid":{"rendered":"https:\/\/www.circuitspecialists.com\/blog\/?p=2344"},"modified":"2022-07-29T12:00:47","modified_gmt":"2022-07-29T19:00:47","slug":"getting-started-with-an-led-matrix-tutorial","status":"publish","type":"post","link":"https:\/\/www.circuitspecialists.com\/blog\/getting-started-with-an-led-matrix-tutorial\/","title":{"rendered":"GETTING STARTED WITH AN LED MATRIX TUTORIAL"},"content":{"rendered":"<p>Now that we&#8217;ve covered &#8220;<a href=\"https:\/\/www.circuitspecialists.com\/blog\/build-8x8-led-matrix\/\" target=\"_blank\" rel=\"noopener\">How to Build Your Own 8&#215;8 LED Matrix<\/a>&#8221; and learned <a href=\"https:\/\/www.circuitspecialists.com\/blog\/8x8-led-matrix-beating-heart-tutorial\/\" target=\"_blank\" rel=\"noopener\">how to program a&nbsp;matrix using the&nbsp;OSEPP Uno arduino device<\/a>; we&#8217;re going to take a step in the other direction and learn a little bit about the &#8220;off the shelf&#8221; class of&nbsp;LED Matrices.<\/p>\n<p>Today we&#8217;ll be using the&nbsp;<a href=\"https:\/\/www.circuitspecialists.com\/25-5970_8x8_red_led_matrix.html\" target=\"_blank\" rel=\"noopener\">KWN-30881CVB&nbsp;1.2&#8243; 8X8 Red LED Matrix<\/a>. This matrix is Common-Row Cathode arrangement, but the pins do NOT correspond in a very straight forward manner.&nbsp;<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2347\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Luckylight-KWM-30881CVB-LED-Matrix-Datasheet-Diagram.jpg\" alt=\"Luckylight KWM-30881CVB LED Matrix Datasheet Diagram\" width=\"600\" height=\"666\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Luckylight-KWM-30881CVB-LED-Matrix-Datasheet-Diagram.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Luckylight-KWM-30881CVB-LED-Matrix-Datasheet-Diagram-270x300.jpg 270w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Looking at the diagram, we see that the rows correspond to the under-side pins: 9, 14, 8, 12, 1, 7, 2, and 5. The columns correspond to pins: 13, 3, 4, 10, 6, 11, 15, and 16.<\/p>\n<p><strong>What does this mean?&nbsp;<\/strong><\/p>\n<p>When we look at this, we start to understand that in order to illuminate a particular LED in the matrix, we must send power to the correct column, and ground to the proper row. But, how do we know which pin is which??<\/p>\n<p>Fortunately for this LED matrix, Luckylight was kind enough to let us know which side is the front&nbsp;of the unit&nbsp;(based on the location of the model number).<\/p>\n<p><strong>But what if I need to find&nbsp;which matrix pin is #1?<\/strong><\/p>\n<p>You can do a quick test!<\/p>\n<p>If you take a look at the wiring diagram for the CVB model, you will see that pins 1 and 16 lead to bulb (5,8) or row 5, column 8.<\/p>\n<p>Almost all matrices will have the first and last pins in the corners of the matrix, so we can use this knowledge to find our pin 1, by attempting to light up bulb (5,8).<\/p>\n<p>Because there is only 4 possible options for pins #1 and #16, it shouldn&#8217;t take us more than a few attempts to light up bulb (5,8).<\/p>\n<p>We&#8217;ll be using a small&nbsp;adjustable <a href=\"https:\/\/www.circuitspecialists.com\/power-supplies-2\" target=\"_blank\" rel=\"noopener\">power supply<\/a> and a couple resistors mounted to the <a href=\"https:\/\/www.circuitspecialists.com\/wb-108+j.html\" target=\"_blank\" rel=\"noopener\">WB-108 breadboard<\/a> for this test. (do not forget the <a href=\"https:\/\/www.circuitspecialists.com\/resnewsec\" target=\"_blank\" rel=\"noopener\">resistors<\/a>!)<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2353\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-Pin-1.jpg\" alt=\"LED Matrix Breadboard Testing Pin 1\" width=\"600\" height=\"449\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-Pin-1.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-Pin-1-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/>Based on the schematics, this should be the &#8220;front&#8221; side of the matrix.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2349\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Find-Pin-1.jpg\" alt=\"LED Matrix Breadboard Find Pin 1\" width=\"600\" height=\"449\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Find-Pin-1.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Find-Pin-1-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Keeping the direction constant, we will now begin sending power and ground through the pins closest to the sides of the matrix, until we find which combination illuminates light (5,8)&#8230;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2352\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-Find-Pin-1.jpg\" alt=\"LED Matrix Breadboard Testing Find Pin 1\" width=\"600\" height=\"546\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-Find-Pin-1.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-Find-Pin-1-300x273.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/>Not quite&#8230;&nbsp;<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2354\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-to-find-Pin-1.jpg\" alt=\"LED Matrix Breadboard Testing to find Pin 1\" width=\"600\" height=\"449\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-to-find-Pin-1.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Testing-to-find-Pin-1-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/>Almost&#8230;<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2350\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Finding-Pin-1-and-16.jpg\" alt=\"LED Matrix Breadboard Finding Pin 1 and 16\" width=\"600\" height=\"528\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Finding-Pin-1-and-16.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Finding-Pin-1-and-16-300x264.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/>There it is!<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2348\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Find-LED-Matrix-Pin-1-and-16-Circuit-Specialists.jpg\" alt=\"Find LED Matrix Pin 1 and 16 - Circuit Specialists\" width=\"600\" height=\"449\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Find-LED-Matrix-Pin-1-and-16-Circuit-Specialists.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Find-LED-Matrix-Pin-1-and-16-Circuit-Specialists-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>With the LED in Row 5, Column 8 illuminated, we can now safely assume that the&nbsp;pin connected to black lead (ground) is Pin #1, and the pin connected to the red lead (power) is Pin #16.<\/p>\n<p><strong>You may be wondering why they&#8217;re on the same side of the board&#8230; <\/strong><\/p>\n<p>As it turns out, most matrices order their pins in a clockwise motion (with pins facing up, starting at #1).<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2360 size-full\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Finding-Pin-1-1.jpg\" alt=\"\" width=\"600\" height=\"800\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Finding-Pin-1-1.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/LED-Matrix-Breadboard-Finding-Pin-1-1-225x300.jpg 225w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/> This is important to note, as well as it&#8217;s important to mark your pins #1 and #16 for reference while programming.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2355\" src=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Mark-Matrix-Pins-1-and-16-Circuit-Specialists-How-to.jpg\" alt=\"Mark Matrix Pins 1 and 16 Circuit Specialists How to\" width=\"600\" height=\"450\" srcset=\"https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Mark-Matrix-Pins-1-and-16-Circuit-Specialists-How-to.jpg 600w, https:\/\/www.circuitspecialists.com\/blog\/wp-content\/uploads\/2016\/02\/Mark-Matrix-Pins-1-and-16-Circuit-Specialists-How-to-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Now that we understand the way the pins work, we can begin programming the matrix to create displays!<\/p>\n<p>Make sure you subscribe to our <a href=\"https:\/\/www.facebook.com\/CircuitSpecialists\/\" target=\"_blank\" rel=\"noopener\">facebook<\/a>, <a href=\"https:\/\/twitter.com\/CircuitSpecial\" target=\"_blank\" rel=\"noopener\">twitter<\/a>, and <a href=\"https:\/\/circuitspecialists.us5.list-manage.com\/subscribe\/post?u=90c415bae67da76dd0e2410e2&amp;id=dd242259e3\" target=\"_blank\" rel=\"noopener\">newsletter<\/a> to keep yourself updated! We will be launching new blogs, reviews, and tutorials each week!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Now that we&#8217;ve covered &#8220;How to Build Your Own 8&#215;8 LED Matrix&#8221; and learned how to program a&nbsp;matrix using the&nbsp;OSEPP<\/p>\n","protected":false},"author":4035,"featured_media":7882,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[1,27,8,134,4,16],"tags":[172,170,131,171],"class_list":["post-2344","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-all-posts","category-breadboards","category-diy","category-led-matrix-tutorials","category-power-supplies","category-resistors","tag-electronics","tag-led-matrix","tag-matrix","tag-programming"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Getting Started with and LED Matrix Tutorial - Find Pin #1<\/title>\n<meta name=\"description\" content=\"Programming an LED Matrix as a display starts with finding the right pins for the job. 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