{"id":2390,"date":"2025-07-05T18:26:38","date_gmt":"2025-07-05T18:26:38","guid":{"rendered":"https:\/\/learnbydoing.dev\/?p=2390"},"modified":"2026-01-10T22:30:21","modified_gmt":"2026-01-10T22:30:21","slug":"how-to-use-i2c-lcd-with-arduino","status":"publish","type":"post","link":"https:\/\/learnbydoing.dev\/how-to-use-i2c-lcd-with-arduino\/","title":{"rendered":"How to use i2c lcd with Arduino"},"content":{"rendered":"
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  • \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\tArduino<\/span>, Electronics<\/span>, Tutoriales<\/span>\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    In this tutorial, <\/span>you’ll<\/span> learn how to use a 16×2 LCD display with an I2C interface using the <\/span>Adafruit_LiquidCrystal<\/span> library. The code example shows how to display a counter that increments every second and blinks the backlight to create a visual effect.<\/span><\/span>\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    What is an I2C LCD Display?<\/strong><\/h3>

    When working with LCD screens and microcontrollers like Arduino, a common challenge is the number of pins required for communication. A standard 16×2 LCD display usually needs at least 6 digital pins<\/strong> to function properly, which can be quite limiting\u2014especially when your project includes many other components.<\/p>

    That’s where the I2C LCD<\/strong> comes in. I2C stands for Inter-Integrated Circuit<\/strong>, and it\u2019s a communication protocol that allows multiple devices to communicate using just two wires<\/strong>:<\/p>

    1. SDA (Serial Data Line)
      <\/strong><\/li>
    2. SCL (Serial Clock Line)

      <\/strong><\/li><\/ol>

      An I2C LCD display is essentially a regular LCD screen that comes with a small I2C backpack module<\/strong> soldered on the back. This backpack handles all the parallel-to-serial conversion, so you only need two pins (plus power and ground) from your Arduino to control the entire screen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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      \u00a0\ud83d\udcdd Required components<\/strong><\/span><\/span><\/span><\/span><\/h3>
      1. Arduino Uno<\/span><\/li>
      2. 16×2 LCD with I2C backpack<\/li>
      3. Jumper wires<\/li>
      4. Breadboard (optional)<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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        Step 1: wiring the electronics<\/span><\/span><\/span><\/b><\/h3>
        1. Connect GND of the LCD to GND on Arduino.

          <\/span><\/li>
        2. Connect VCC of the LCD to 5V on Arduino.

          <\/span><\/li>
        3. Connect SDA on the LCD to A4 on Arduino.

          <\/span><\/li>
        4. Connect SCL on the LCD to A5 on Arduino.<\/span><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          \ud83d\udda5\ufe0fStep 2: Writing the Code<\/span><\/b><\/h3>

          Below you will find the complete code to use the humidity sensor:<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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          \n\t\t\t\t\n\t\t\t\t\tUpload this sketch to display a message: \r\n\r\n \r\n#include <Wire.h> \r\n#include <LiquidCrystal_I2C.h> \r\n \r\nLiquidCrystal_I2C lcd(0x27, 16, 2);  \/\/ Set I2C address 0x27, 16 columns and 2 rows \r\n \r\nvoid setup() { \r\n  lcd.init();                       \/\/ Initialize the LCD \r\n  lcd.backlight();                  \/\/ Turn on the backlight \r\n  lcd.setCursor(0, 0);              \/\/ First column, first row \r\n  lcd.print(\"Hello, World!\");       \/\/ Print message on first row \r\n  lcd.setCursor(0, 1);              \/\/ First column, second row \r\n  lcd.print(\"I2C LCD Demo\");        \/\/ Print message on second row \r\n} \r\n \r\nvoid loop() { \r\n  \/\/ Nothing needed here \r\n} \r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a888ec elementor-widget elementor-widget-text-editor\" data-id=\"7a888ec\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3><b>\ud83d\udd0e\u00a0<\/b><b>Breaking down the Code<\/b><\/h3><p>Let\u2019s review the code section by section:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-01f8801 elementor-widget elementor-widget-code-highlight\" data-id=\"01f8801\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>#include <Adafruit_LiquidCrystal.h>\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-16783b7 elementor-widget elementor-widget-text-editor\" data-id=\"16783b7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><p data-start=\"436\" data-end=\"533\">Includes the <strong data-start=\"452\" data-end=\"478\">Adafruit_LiquidCrystal<\/strong> library that allows you to control the I2C LCD easily.<\/p><\/li><li><p data-start=\"436\" data-end=\"533\">Make sure to install this library via the <strong data-start=\"582\" data-end=\"609\">Arduino Library Manager<\/strong>.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7242351 elementor-widget elementor-widget-code-highlight\" data-id=\"7242351\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>int seconds = 0;\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0887672 elementor-widget elementor-widget-text-editor\" data-id=\"0887672\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"1016\" data-end=\"1071\">Declares a global variable <code data-start=\"675\" data-end=\"684\">seconds<\/code> to store the number of seconds that have passed.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-988ae1f elementor-widget elementor-widget-code-highlight\" data-id=\"988ae1f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>Adafruit_LiquidCrystal lcd_1(0);\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-455a2f8 elementor-widget elementor-widget-text-editor\" data-id=\"455a2f8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"1536\" data-end=\"1595\"><p data-start=\"784\" data-end=\"823\">Creates an LCD object named <code data-start=\"815\" data-end=\"822\">lcd_1<\/code>.<\/p><\/li><li data-start=\"1536\" data-end=\"1595\"><p data-start=\"784\" data-end=\"823\">The argument <code data-start=\"840\" data-end=\"843\">0<\/code> is a <strong data-start=\"849\" data-end=\"865\">reference ID<\/strong> (not the I2C address). In some versions, you might use <code data-start=\"921\" data-end=\"934\">lcd_1(0x27)<\/code> or <code data-start=\"938\" data-end=\"951\">lcd_1(0x3F)<\/code> depending on your I2C backpack.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6503883 elementor-widget elementor-widget-code-highlight\" data-id=\"6503883\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>void setup() {\r\n  lcd_1.begin(16, 2);           \/\/ Initialize 16x2 LCD\r\n  lcd_1.print(\"hello world\");   \/\/ Print on first row\r\n}\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b51cf90 elementor-widget elementor-widget-text-editor\" data-id=\"b51cf90\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul data-start=\"1503\" data-end=\"1581\"><li data-start=\"1503\" data-end=\"1532\"><ul><li data-start=\"1155\" data-end=\"1230\"><p data-start=\"1157\" data-end=\"1230\"><code data-start=\"1157\" data-end=\"1178\">lcd_1.begin(16, 2);<\/code> initializes the LCD with <strong data-start=\"1204\" data-end=\"1229\">16 columns and 2 rows<\/strong>.<\/p><\/li><li data-start=\"1231\" data-end=\"1346\"><p data-start=\"1233\" data-end=\"1346\"><code data-start=\"1233\" data-end=\"1262\">lcd_1.print(\"hello world\");<\/code> prints the message starting from the <strong data-start=\"1300\" data-end=\"1312\">top-left<\/strong> corner (default cursor position).<\/p><\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6f27b82 elementor-widget elementor-widget-code-highlight\" data-id=\"6f27b82\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>lcd_1.setCursor(0, 1);\r\nlcd_1.print(seconds);\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9b822a2 elementor-widget elementor-widget-text-editor\" data-id=\"9b822a2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul data-start=\"1503\" data-end=\"1581\"><li data-start=\"1503\" data-end=\"1532\"><ul><li data-start=\"1435\" data-end=\"1540\"><p data-start=\"1437\" data-end=\"1540\">These lines <strong data-start=\"1865\" data-end=\"1889\">toggle the backlight<\/strong> on and off every second to create a blinking effect.<\/p><\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-52f7e5d elementor-widget elementor-widget-code-highlight\" data-id=\"52f7e5d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-cpp line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-cpp\">\n\t\t\t\t\t<xmp>seconds += 1;<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1b5b0c4 elementor-widget elementor-widget-text-editor\" data-id=\"1b5b0c4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"1830\" data-end=\"1890\"><p data-start=\"1567\" data-end=\"1605\">Increments the counter by 1 each time the loop runs (once per second).<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c92ae44 elementor-widget elementor-widget-text-editor\" data-id=\"c92ae44\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3><b style=\"color: inherit; font-family: inherit; font-size: 2rem; text-wrap-mode: initial;\"><span data-contrast=\"none\">\ud83d\udee0\ufe0f<\/span><\/b><b><span data-contrast=\"none\">Step 3: Troubleshooting<\/span><\/b><\/h3><p><strong>Nothing appears on the LCD:<\/strong><\/p><ul><li><span data-contrast=\"auto\">Verify the I2C address with an I2C scanner sketch.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li><li><span data-contrast=\"auto\">Check wiring (SDA to A4, SCL to A5).<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li><\/ul><p>\u00a0<\/p><p><strong>Text is garbled:\u00a0<\/strong><\/p><ul><li><span data-contrast=\"auto\">Adjust potentiometer on I2C backpack to set contrast.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>In this tutorial, you&#8217;ll learn how to use a 16&#215;2 LCD display with an I2C interface using the Adafruit_LiquidCrystal library. The code example shows how to display a counter that increments every second and blinks the backlight to create a visual effect.\u00a0 What is an I2C LCD Display? When working with LCD screens and microcontrollers [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2497,"comment_status":"closed","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[68,69,43],"tags":[261,59,84,264,83,160,263,82,179,262,66,270,164,165,267,269,266,162,265,76,64,268],"class_list":["post-2390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-electronics","category-tutorials","tag-261","tag-arduino","tag-c","tag-comunication","tag-cpp","tag-display","tag-i2c","tag-ide","tag-lbd","tag-lcd","tag-learn-by-doing","tag-learning","tag-liquidcrystal","tag-liquidcrystal-h","tag-pins","tag-project","tag-scl","tag-screen","tag-sda","tag-step-by-step","tag-tutorial","tag-uno"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to use i2c lcd with Arduino - Learn by Doing!<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnbydoing.dev\/es\/how-to-use-i2c-lcd-with-arduino\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Installing ROS 2 Jazzy on Ubuntu 24.04: Step-by-Step Tutorial\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, you&#8217;ll learn how to use a 16&#215;2 LCD display with an I2C interface using the Adafruit_LiquidCrystal library. 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