{"id":2076,"date":"2022-07-06T15:34:06","date_gmt":"2022-07-06T22:34:06","guid":{"rendered":"https:\/\/www.crystalfontz.com\/blog\/?p=2076"},"modified":"2025-05-01T14:07:09","modified_gmt":"2025-05-01T21:07:09","slug":"flexible-oled-smart-watch","status":"publish","type":"post","link":"https:\/\/www.crystalfontz.com\/blog\/flexible-oled-smart-watch\/","title":{"rendered":"Flexible OLED Smart Watch"},"content":{"rendered":"\n<div class=\"wp-block-media-text alignwide has-media-on-the-right is-stacked-on-mobile\" style=\"grid-template-columns:auto 25%\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"500\" src=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0253-Edit-kz.jpg\" alt=\"\" class=\"wp-image-2088 size-full\" srcset=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0253-Edit-kz.jpg 400w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0253-Edit-kz-240x300.jpg 240w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0253-Edit-kz-120x150.jpg 120w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\"><\/figure><div class=\"wp-block-media-text__content\">\n<p>Kevin Choi is back at it with neat projects. Last time, it was <a href=\"https:\/\/www.crystalfontz.com\/blog\/transparent-oled-glasses\/\" target=\"_blank\" rel=\"noreferrer noopener\">Transparent OLED smart glasses<\/a>, this time a <a href=\"https:\/\/www.instagram.com\/p\/Ceg8hnHPCkn\/\">cuff-style watch with an embedded flexible OLED<\/a>!<\/p>\n\n\n\n<p>This watch uses our <a href=\"https:\/\/www.crystalfontz.com\/product\/cfal16032a0018pw-flexible-oled-display-160x32\">flexible OLED<\/a> bent into the cuff chassis. A button on an attached ring allows Kevin to turn the <a href=\"https:\/\/www.crystalfontz.com\/blog\/glossary\/oled\/\" target=\"_self\" title=\"OLED stands for Organic Light Emitting Diode. OLEDs are used to make OLED Displays, which can either be PMOLED (Passive Matrix OLED) or AMOLED (Active Matrix OLED). Crystalfontz carries a full line of OLED modules. Detailed Definition What makes OLEDs useful for display construction is that they can be fabricated in bulk. For instance, to&hellip;\" class=\"encyclopedia\">OLED<\/a> on and off (a smart way to conserve battery life and extend the OLED lifetime!)<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Kevin&rsquo;s Description of His Build<\/h2>\n\n\n\n<p>The inspiration for this watch came from the Cuff Links from Hideo Kojima&rsquo;s&nbsp;<em>Death Stranding<\/em>&nbsp;and&nbsp;the black and gold aesthetic from&nbsp;<em>Deus Ex<\/em>.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-media-text alignwide has-media-on-the-right is-stacked-on-mobile\" style=\"grid-template-columns:auto 41%\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"800\" src=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/pro-sketch-1.jpg\" alt=\"\" class=\"wp-image-2079 size-full\" srcset=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/pro-sketch-1.jpg 640w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/pro-sketch-1-240x300.jpg 240w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/pro-sketch-1-120x150.jpg 120w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\"><\/figure><div class=\"wp-block-media-text__content\">\n<h3 class=\"wp-block-heading\">Part List:<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.crystalfontz.com\/product\/cfal16032a0018pw-flexible-oled-display-160x32\">160&times;32 Flexible OLED Display<\/a><\/li><li>SparkFun SSD1320 breakout<\/li><li>Arduino Nano Every<\/li><li>Adafruit DS3231 RTC module<\/li><li>Adafruit DIY Magnetic 3 Pin Connector<\/li><li>3.7v 280mAh battery<\/li><li>TP4056 battery charge protection circuit<\/li><li>3D printed PLA inner chassis<\/li><li>Brass sheet metal outer chassis<\/li><\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Build Description<\/h3>\n\n\n\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"533\" src=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0322-Edit.jpg\" alt=\"\" class=\"wp-image-2085 size-full\" srcset=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0322-Edit.jpg 800w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0322-Edit-300x200.jpg 300w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0322-Edit-120x80.jpg 120w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0322-Edit-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\"><\/figure><div class=\"wp-block-media-text__content\">\n<p>The watch is running on an Arduino Nano Every, wired up to a breakout board to drive the flexible OLED, an RTC module to keep time, and a lithium ion battery for power.&nbsp;<\/p>\n\n\n\n<p>The breakout board from SparkFun uses <a href=\"https:\/\/www.crystalfontz.com\/blog\/glossary\/spi\/\" target=\"_self\" title='SPI stands for Serial Peripheral Interface. SPI is a simple serial bus that is often used by LCD or OLED controllers. SPI as implemented for OLED and LCD controllers typically uses a \"3-wire SPI\" or \"4-wire SPI\" scheme. Detailed Definition SPI was originally championed by Motorola (now Freescale). In its original \"pure\" form SPI uses&hellip;' class=\"encyclopedia\">SPI<\/a> protocol, so in addition to Vin and GND wires to power the display, SCLK, SDIN, CS, and RES on the breakout board are wired and soldered to pins D13, D11, D8, and D9 on the Nano Every respectively. <em>Note &ndash; the CS pin on the Nano Every is on D8 rather than D10, like it is on other Arduino controllers. It took me a while to figure that out.<\/em>&nbsp;<\/p>\n\n\n\n<p>The Adafruit DS3231 RTC module, which was the smallest I could find, uses the <a href=\"https:\/\/www.crystalfontz.com\/blog\/glossary\/i2c\/\" target=\"_self\" title='I2C or IIC stands for \"Inter-Integrated Circuit,\" and was originally intended as a way to communicate from one IC to another, usually on the same PCB. I2C is a bi-directional serial bus that was originally created by Philips (now NXP). Detailed Definition In a typical I2C application, there will be one master, and one or&hellip;' class=\"encyclopedia\">I2C<\/a> interface, so its SDA and SCL pins are connected to the Nano Every&rsquo;s D18 and D19 pins. All pin headers were removed from these boards and modules to maximize space efficiency.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-media-text alignwide has-media-on-the-right is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"533\" src=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0332.jpg\" alt=\"\" class=\"wp-image-2091 size-full\" srcset=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0332.jpg 800w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0332-300x200.jpg 300w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0332-120x80.jpg 120w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0332-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\"><\/figure><div class=\"wp-block-media-text__content\">\n<p>Pin D14 is wired to one terminal of a push button mounted on the back of the brass chassis, with Pins D6 and GND wired to the button&rsquo;s opposite terminal. Pressing this button tells the Arduino to print the current time and date to the display and clear on a 5 second delay. The wires leading to the button terminals also split off to two pins on the 3 pin &ldquo;female&rdquo; mag connector, which is exposed on the top of the 3D printed inner chassis. Its corresponding &ldquo;male&rdquo; connector is wired to another push button mounted on a 3D printed ring, so when this ring is connected to the watch, pressing it also prints the time. This lets me wake the display without having to reach over to press the chassis button with my other hand, and also because I didn&rsquo;t want to have to deal with any sort of annoying wrist-lifting gesture to try and wake the display.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:47% auto\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"533\" src=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0330.jpg\" alt=\"\" class=\"wp-image-2093 size-full\" srcset=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0330.jpg 800w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0330-300x200.jpg 300w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0330-120x80.jpg 120w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0330-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\"><\/figure><div class=\"wp-block-media-text__content\">\n<p>The lithium ion battery used to power the watch is connected to a TP4056 battery charge protection circuit, and the positive and negative out pins from that are connected to the Nano Every&rsquo;s Vin and GND pins. The TP4056 typically charges with a micro-USB cable, but because it is inside the watch the charging port wouldn&rsquo;t be able to be used, so I desoldered that micro-USB connector, and soldered positive and negative wires that run to another 3 pin mag connector, which is mounted on the bottom side of the inner chassis. Its corresponding mag connector will be placed in a 3D printed charging dock.<\/p>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Chassis Build<\/h3>\n\n\n\n<div class=\"wp-block-media-text alignwide has-media-on-the-right is-stacked-on-mobile\" style=\"grid-template-columns:auto 41%\"><figure class=\"wp-block-media-text__media\"><img decoding=\"async\" src=\"blob:https:\/\/www.crystalfontz.com\/5d2586c1-9b6f-4b33-a3ad-134c757860db\" alt=\"\"><\/figure><div class=\"wp-block-media-text__content\">\n<p>The 3D printed inner chassis was modeled in Rhino using custom measurements from my wrist. I used this 3D model to verify that all the PCBs and components would properly fit before purchasing them. The inner chassis was then printed on a Creality Ender 3 printer with black PLA with a print-in-place hinge and a basic latch design. Because I wanted it to be a smooth finish, I sanded the final print down starting from around 300 grit and worked up to 1000 grit.<\/p>\n\n\n\n<p>The outer chassis was made with .016&Prime; thick brass sheet metal. I decided to use brass for this portion because instead of welding, it can easily be soldered instead to the same effect. Other metals like copper and aluminum could theoretically work as well.&nbsp;<\/p>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Future Improvements <\/h3>\n\n\n\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:33% auto\"><figure class=\"wp-block-media-text__media\"><img decoding=\"async\" src=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/IMG_0254-Edit-kz.jpg\" alt=\"\" class=\"wp-image-2084 size-full\"><\/figure><div class=\"wp-block-media-text__content\">\n<p>At the moment, this smart watch is honestly not that smart, as it is currently only running on an Arduino Nano Every which lacks any WiFi or Bluetooth connectivity. However, the Every will soon be replaced with an ESP32 TinyPICO, which should be able to be used in tandem with the Blynk app for some smart functionality. Other features that I will start working into V2 include other basic watch functionality such as timers and alarms, low-power mode for better battery life, LEDs for a built-in flashlight, and possibly a heart-rate monitor.<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Other Projects<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-crystalfontz-lcd-blog wp-block-embed-crystalfontz-lcd-blog\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"azWgQmRaci\"><a href=\"https:\/\/www.crystalfontz.com\/blog\/transparent-oled-glasses\/\">Transparent OLED Smart Glasses<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&ldquo;Transparent OLED Smart Glasses&rdquo; &mdash; Crystalfontz LCD Blog\" src=\"https:\/\/www.crystalfontz.com\/blog\/transparent-oled-glasses\/embed\/#?secret=B0BpzbSf3f#?secret=azWgQmRaci\" data-secret=\"azWgQmRaci\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-crystalfontz-lcd-blog wp-block-embed-crystalfontz-lcd-blog\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"FXIJwUbRQF\"><a href=\"https:\/\/www.crystalfontz.com\/blog\/small-full-color-oled\/\">Tiny OLED Full Color Slideshow<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&ldquo;Tiny OLED Full Color Slideshow&rdquo; &mdash; Crystalfontz LCD Blog\" src=\"https:\/\/www.crystalfontz.com\/blog\/small-full-color-oled\/embed\/#?secret=C9xnMDAVlQ#?secret=FXIJwUbRQF\" data-secret=\"FXIJwUbRQF\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-crystalfontz-lcd-blog wp-block-embed-crystalfontz-lcd-blog\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"TwrWqgy1AJ\"><a href=\"https:\/\/www.crystalfontz.com\/blog\/diy-transparent-display\/\">Transparent Display: How to Hack Together Your Own Transparent Display<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&ldquo;Transparent Display: How to Hack Together Your Own Transparent Display&rdquo; &mdash; Crystalfontz LCD Blog\" src=\"https:\/\/www.crystalfontz.com\/blog\/diy-transparent-display\/embed\/#?secret=cbcZEOOmtE#?secret=TwrWqgy1AJ\" data-secret=\"TwrWqgy1AJ\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Contact Us<\/h3>\n\n\n\n<p class=\"has-black-color has-text-color\">If you have any questions, we can be reached at support@crystalfontz.com, we also provide <a href=\"https:\/\/www.crystalfontz.com\/contact.php\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\" (opens in a new tab)\">chat and telephone support<\/a> Monday through Friday during our open hours.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color\">We love to hear about your projects! Find us around the web (<a href=\"https:\/\/www.youtube.com\/user\/CrystalfontzAmerica\/?mc_cid=364fa8437c&amp;mc_eid=%5BUNIQID%5D\" target=\"_blank\" rel=\"noreferrer noopener\">YouTube<\/a>,&nbsp;<a href=\"https:\/\/www.facebook.com\/CrystalfontzAmericaInc\/?mc_cid=364fa8437c&amp;mc_eid=%5BUNIQID%5D\" target=\"_blank\" rel=\"noreferrer noopener\">Facebook<\/a>,&nbsp;<a href=\"https:\/\/www.instagram.com\/crystalfontz\/?mc_cid=364fa8437c&amp;mc_eid=%5BUNIQID%5D\" target=\"_blank\" rel=\"noreferrer noopener\">Instagram<\/a>,&nbsp;<a href=\"https:\/\/www.linkedin.com\/company\/crystalfontz-america-inc\/?mc_cid=364fa8437c&amp;mc_eid=%5BUNIQID%5D\" target=\"_blank\" rel=\"noreferrer noopener\">LinkedIn<\/a>, &nbsp;<a href=\"https:\/\/twitter.com\/Crystalfontz?mc_cid=364fa8437c&amp;mc_eid=%5BUNIQID%5D\" target=\"_blank\" rel=\"noreferrer noopener\">Twitter<\/a>, <a href=\"https:\/\/forum.crystalfontz.com\" target=\"_blank\" rel=\"noreferrer noopener\">Forum<\/a>) and let us know what you&rsquo;re working on.<\/p>\n\n\n\n<!-- Begin Mailchimp Signup Form -->\n<link href=\"\/\/cdn-images.mailchimp.com\/embedcode\/horizontal-slim-10_7.css\" rel=\"stylesheet\" type=\"text\/css\">\n<style type=\"text\/css\">\n\t#mc_embed_signup{background:#fff; clear:left; font:14px Helvetica,Arial,sans-serif; width:100%;}\n<\/style>\n<div id=\"mc_embed_signup\">\n<form action=\"https:\/\/crystalfontz.us17.list-manage.com\/subscribe\/post?u=8a880dec17face7992ae6ef10&amp;id=7268847031\" method=\"post\" id=\"mc-embedded-subscribe-form\" name=\"mc-embedded-subscribe-form\" class=\"validate\" target=\"_blank\" novalidate=\"\">\n    <div id=\"mc_embed_signup_scroll\">\n\t<label for=\"mce-EMAIL\">Subscribe to our Newsletter<\/label>\n\t<input type=\"email\" value=\"\" name=\"EMAIL\" class=\"email\" id=\"mce-EMAIL\" placeholder=\"email address\" required=\"\">\n    <!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->\n    <div style=\"position: absolute; left: -5000px;\" aria-hidden=\"true\"><input type=\"text\" name=\"b_8a880dec17face7992ae6ef10_7268847031\" tabindex=\"-1\" value=\"\"><\/div>\n    <div class=\"clear\"><input type=\"submit\" value=\"Subscribe\" name=\"subscribe\" id=\"mc-embedded-subscribe\" class=\"button\"><\/div>\n    <\/div>\n<\/form>\n<\/div>\n\n<!--End mc_embed_signup-->\n","protected":false},"excerpt":{"rendered":"<p>Kevin Choi is back at it with neat projects. Last time, it was Transparent OLED smart glasses, this time a cuff-style watch with an embedded flexible OLED! This watch uses our flexible OLED bent into the cuff chassis. A button on an attached ring allows Kevin to turn the OLED on and off (a smart [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":2084,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[59,31],"tags":[157,159,158],"class_list":["post-2076","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-in-the-wild","category-oled","tag-flexible-oled","tag-oled-project","tag-smart-watch"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Flexible OLED Smart Watch<\/title>\n<meta name=\"description\" content=\"Flexible OLED Smart Watch : Kevin Choi is back at it with neat projects. 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