{"id":2563,"date":"2017-07-12T16:34:42","date_gmt":"2017-07-12T15:34:42","guid":{"rendered":"http:\/\/www.robertprice.co.uk\/robblog\/?p=2563"},"modified":"2017-07-12T16:34:42","modified_gmt":"2017-07-12T15:34:42","slug":"using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu","status":"publish","type":"post","link":"https:\/\/www.robertprice.co.uk\/robblog\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\/","title":{"rendered":"Using an i2c 128&#215;64 OLED display with Lua on a NodeMCU"},"content":{"rendered":"<p>Small <a href=\"https:\/\/www.amazon.co.uk\/gp\/search\/ref=as_li_qf_sp_sr_tl?ie=UTF8&#038;tag=robertprcouk-21&#038;keywords=B011AVLUCO&#038;index=aps&#038;camp=1634&#038;creative=6738&#038;linkCode=ur2&#038;linkId=422e24bfb1d5b87d9c667ae14490b173\">128&#215;64 OLED i2c displays<\/a> can picked up for just over \u00a33 on Amazon, and they are great for interfacing with a <a href=\"https:\/\/www.amazon.co.uk\/gp\/search\/ref=as_li_qf_sp_sr_tl?ie=UTF8&#038;tag=robertprcouk-21&#038;keywords=B01JFK35Y8&#038;index=aps&#038;camp=1634&#038;creative=6738&#038;linkCode=ur2&#038;linkId=d1c69f05d13504a02e40f1d8f100f175u\">NodeMCU<\/a> IoT device.<\/p>\n<p>Wiring is simple&#8230;<\/p>\n<ul>\n<li>NodeMCU 3.3v &#8211; OLED VCC<\/li>\n<li>NodeMCU GND &#8211; OLED GND<\/li>\n<li>NodeMCU D1 &#8211; OLED SDA<\/li>\n<li>NodeMCU D2 &#8211; OLED SCL or SCK<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.robertprice.co.uk\/robblog\/assets\/nodemcu-oled.png\" alt=\"Wiring an i2c OLED display to a NodeMCU\" width=\"909\" height=\"645\" class=\"aligncenter size-full wp-image-2565\" srcset=\"https:\/\/www.robertprice.co.uk\/robblog\/assets\/nodemcu-oled.png 909w, https:\/\/www.robertprice.co.uk\/robblog\/assets\/nodemcu-oled-300x213.png 300w, https:\/\/www.robertprice.co.uk\/robblog\/assets\/nodemcu-oled-768x545.png 768w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/p>\n<p>Your NodeMCU firmware must have been compiled with the <a href=\"https:\/\/nodemcu.readthedocs.io\/en\/master\/en\/modules\/i2c\/\">i2c<\/a> and <a href=\"https:\/\/nodemcu.readthedocs.io\/en\/master\/en\/modules\/u8g\/\">u8g<\/a> modules included. If you need to add these, see my previous post &#8211; <a href=\"\/robblog\/nodemcu-lua-setup-using-mac\/\">NodeMCU Lua setup using a Mac<\/a>. It also explains how to upload the example Lua code below.<\/p>\n<p>The u8g module comes with some great examples. I&#8217;ve taken some of the relevant parts for a simple two page Lua script that prints out two alternating screens of text.<\/p>\n<pre>\r\nsda = 1 -- SDA Pin\r\nscl = 2 -- SCL Pin\r\n\r\nfunction init_display(sda,scl) --Set up the u8glib lib\r\n     sla = 0x3C\r\n     i2c.setup(0, sda, scl, i2c.SLOW)\r\n     disp = u8g.ssd1306_128x64_i2c(sla)\r\n     disp:setFont(u8g.font_6x10)\r\n     disp:setFontRefHeightExtendedText()\r\n     disp:setDefaultForegroundColor()\r\n     disp:setFontPosTop()\r\nend\r\n\r\nfunction updateDisplay(func)\r\n  -- Draws one page and schedules the next page, if there is one\r\n  local function drawPages()\r\n    func()\r\n    if (disp:nextPage() == true) then\r\n      node.task.post(drawPages)\r\n    end\r\n  end\r\n  -- Restart the draw loop and start drawing pages\r\n  disp:firstPage()\r\n  node.task.post(drawPages)\r\nend\r\n\r\nfunction drawScreen1()\r\n     disp:drawFrame(2,2,126,62)\r\n     disp:drawFrame(5,5,121,57)\r\n     disp:drawStr(5, 20, \"  RobertPrice.co.uk\")\r\n     disp:drawStr(5, 35, \"    @robertprice\")\r\nend\r\n\r\nfunction drawScreen2()\r\n     disp:drawFrame(2,2,126,62)\r\n     disp:drawFrame(5,5,121,57)\r\n     disp:drawStr(5, 20, \"  NodeMCU OLED Test\")\r\n     disp:drawStr(5, 35, \"   12th July 2017\")\r\nend\r\n\r\nlocal drawDemo = { drawScreen1, drawScreen2 }\r\n\r\nfunction demoLoop()\r\n  -- Start the draw loop with one of the demo functions\r\n  local f = table.remove(drawDemo,1)\r\n  updateDisplay(f)\r\n  table.insert(drawDemo,f)\r\nend\r\n\r\ninit_display(sda,scl)\r\ndemoLoop()\r\ntmr.alarm(4, 5000, 1, demoLoop)\r\n<\/pre>\n<p>This may look a bit complex for just displaying text, but it aims to be reusable. We use the <a href=\"https:\/\/nodemcu.readthedocs.io\/en\/master\/en\/modules\/tmr\/#tmralarm\">tmr.alarm<\/a> to avoid bogging the CPU down in a loop. <\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.robertprice.co.uk\/robblog\/assets\/oled-example.jpg\" alt=\"NodeMCU driving an i2c OLED display\" width=\"1200\" height=\"600\" class=\"aligncenter size-full wp-image-2567\" srcset=\"https:\/\/www.robertprice.co.uk\/robblog\/assets\/oled-example.jpg 1200w, https:\/\/www.robertprice.co.uk\/robblog\/assets\/oled-example-300x150.jpg 300w, https:\/\/www.robertprice.co.uk\/robblog\/assets\/oled-example-768x384.jpg 768w, https:\/\/www.robertprice.co.uk\/robblog\/assets\/oled-example-1024x512.jpg 1024w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/p>\n<p>I&#8217;ve tried this with two different i2c OLED displays, and they both work.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Small 128&#215;64 OLED i2c displays can picked up for just over \u00a33 on Amazon, and they are great for interfacing with a NodeMCU IoT device. Wiring is simple&#8230; NodeMCU 3.3v &#8211; OLED VCC NodeMCU GND &#8211; OLED GND NodeMCU D1 &#8211; OLED SDA NodeMCU D2 &#8211; OLED SCL or SCK Your NodeMCU firmware must have &hellip; <a href=\"https:\/\/www.robertprice.co.uk\/robblog\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Using an i2c 128&#215;64 OLED display with Lua on a NodeMCU&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":2568,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[2,84],"tags":[94,92,91,93],"class_list":["post-2563","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev","category-hardware","tag-i2c","tag-lua","tag-nodemcu","tag-oled"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Using an i2c 128x64 OLED display with Lua on a NodeMCU - Robert Price<\/title>\n<meta name=\"description\" content=\"A working example of how to wire a NodeMCU device to an i2c 128x64 OLED display. The example Lua script alternates between two different displays.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.robertprice.co.uk\/robblog\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using an i2c 128x64 OLED display with Lua on a NodeMCU - Robert Price\" \/>\n<meta property=\"og:description\" content=\"A working example of how to wire a NodeMCU device to an i2c 128x64 OLED display. The example Lua script alternates between two different displays.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.robertprice.co.uk\/robblog\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\/\" \/>\n<meta property=\"og:site_name\" content=\"Robert Price\" \/>\n<meta property=\"article:published_time\" content=\"2017-07-12T15:34:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.robertprice.co.uk\/robblog\/assets\/oled-example3.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"rob\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rob\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\\\/\"},\"author\":{\"name\":\"rob\",\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/#\\\/schema\\\/person\\\/fac6d5b076e0e14e1fb13e15b542a6c5\"},\"headline\":\"Using an i2c 128&#215;64 OLED display with Lua on a NodeMCU\",\"datePublished\":\"2017-07-12T15:34:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\\\/\"},\"wordCount\":183,\"image\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/assets\\\/oled-example3.jpg\",\"keywords\":[\"i2c\",\"Lua\",\"NodeMCU\",\"OLED\"],\"articleSection\":[\"Dev\",\"Hardware\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\\\/\",\"url\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\\\/\",\"name\":\"Using an i2c 128x64 OLED display with Lua on a NodeMCU - Robert Price\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/using-an-i2c-128x64-oled-display-with-lua-on-a-nodemcu\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/assets\\\/oled-example3.jpg\",\"datePublished\":\"2017-07-12T15:34:42+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/#\\\/schema\\\/person\\\/fac6d5b076e0e14e1fb13e15b542a6c5\"},\"description\":\"A working example of how to wire a NodeMCU device to an i2c 128x64 OLED display. 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