{"id":1888,"date":"2025-06-24T15:50:21","date_gmt":"2025-06-24T15:50:21","guid":{"rendered":"https:\/\/learnbydoing.dev\/?p=1888"},"modified":"2026-01-10T22:42:05","modified_gmt":"2026-01-10T22:42:05","slug":"how-to-use-a-button-with-arduino-2","status":"publish","type":"post","link":"https:\/\/learnbydoing.dev\/how-to-use-a-button-with-arduino-2\/","title":{"rendered":"How to turn on an LED using a button 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, we will learn how to control an LED using a push button connected to an Arduino Uno. We will also explore the use of resistors: how to choose them, their function, and how to read their color codes.<\/span><\/span><\/span><\/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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    \u00a0\ud83d\udcdd Required components<\/span><\/span><\/h3>

    • 1 x <\/span><\/span>Arduino Uno<\/span><\/span><\/strong> (or compatible board)<\/span><\/span><\/p><\/li>

    • Push button<\/span><\/span><\/strong><\/li>
    • LED (any color)<\/span><\/span><\/strong><\/li>
    • 220\u03a9 resistor (for the LED)<\/span><\/span><\/strong><\/li>
    • 10k\u03a9 resistor<\/span><\/span><\/strong><\/li>

    • Jumper wires<\/strong><\/p><\/li>

    • Breadboard<\/span><\/span>\u00a0<\/span><\/strong><\/li><\/ul>\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><\/b>\u00a0<\/span><\/h3>
      1. Connect the LED’s anode (longer leg) to Arduino pin 4 through a 220\u03a9 resistor.<\/span><\/li>
      2. Connect the cathode (shorter leg) of the LED to GND.<\/span><\/li>
      3. Connect one leg of the button to Arduino digital pin 2.<\/span><\/li>
      4. Connect the other leg of the button to GND through a 10k\u03a9 resistor (pull-down).<\/span><\/li>
      5. Now connect the bottom right leg directly to 5V.<\/span>\u00a0
        \u00a0<\/span><\/li><\/ol>

        The 220\u03a9 resistor limits the current going through the LED to prevent it from burning out. The 10k\u03a9 resistor ensures that the button pin reads LOW when the button is not pressed.<\/span><\/p>


        <\/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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        \ud83d\udda5\ufe0f\u200bStep 2: Writing the Code<\/span><\/b>\u00a0<\/span><\/h2>

        Below you will find the complete code to make the LED turn on when the button is pressed:<\/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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        \u00a0Complete Arduino code<\/span><\/span><\/h3>

        This is the complete code to use the button with Arduino:<\/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\tconst int buttonPin = 7;      \/\/ Pin connected to the button \r\nconst int ledPin = 13;        \/\/ Pin connected to the LED \r\n \r\nint buttonState = 0;          \/\/ Variable to store button state \r\n \r\nvoid setup() { \r\n  pinMode(buttonPin, INPUT);  \/\/ Set button pin as input \r\n  pinMode(ledPin, OUTPUT);    \/\/ Set LED pin as output \r\n} \r\n \r\nvoid loop() { \r\n  buttonState = digitalRead(buttonPin); \r\n \r\n  if (buttonState == HIGH) { \r\n    digitalWrite(ledPin, HIGH); \/\/ Turn LED on \r\n  } else { \r\n    digitalWrite(ledPin, LOW);  \/\/ Turn LED off \r\n  } \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\ud83d\udca3<\/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>buttonPin<\/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<p data-start=\"1857\" data-end=\"1885\">\u00a0I<span class=\"TextRun SCXW178997497 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW178997497 BCX0\">s used to detect the button press.<\/span><\/span><\/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-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>ledPin<\/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<p data-start=\"1857\" data-end=\"1885\">\u00a0C<span class=\"TextRun SCXW220550607 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW220550607 BCX0\">ontrols the LED.<\/span><\/span><\/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-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>pinMode()<\/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<p data-start=\"1857\" data-end=\"1885\">\u00a0S<span class=\"TextRun SCXW19431217 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW19431217 BCX0\">ets up the pins as input or output.<\/span><\/span><\/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-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>digitalRead()<\/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<p data-start=\"3514\" data-end=\"3644\">\u00a0C<span class=\"TextRun SCXW186641380 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW186641380 BCX0\"><span class=\"TextRun SCXW46389094 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW46389094 BCX0\">hecks if the button is pressed.<\/span><\/span><\/span><\/span><\/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-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>digitalWrite()<\/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-2547d99 elementor-widget elementor-widget-text-editor\" data-id=\"2547d99\" 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<p data-start=\"0\" data-end=\"69\">T<span class=\"TextRun SCXW259034391 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW259034391 BCX0\">urns the LED on or off based on the button&#8217;s state.<\/span><\/span><span class=\"EOP SCXW259034391 BCX0\" data-ccp-props=\"{}\">\u00a0<\/span><\/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-8de62e2 elementor-widget elementor-widget-text-editor\" data-id=\"8de62e2\" 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<h4><strong><span class=\"TextRun SCXW158037720 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW158037720 BCX0\" data-ccp-parastyle=\"heading 2\">Understanding Resistors<\/span><\/span><span class=\"EOP SCXW158037720 BCX0\" data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:200,&quot;335559739&quot;:0}\">\u00a0<\/span><\/strong><\/h4><p><span class=\"TextRun SCXW44441665 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW44441665 BCX0\">Resistors limit the current in a circuit. For LEDs, a 220\u03a9 resistor ensures safe current levels. For buttons, a 10k\u03a9 pull-down resistor ensures the signal is stable (LOW when not pressed).<\/span><\/span><span class=\"EOP SCXW44441665 BCX0\" data-ccp-props=\"{}\">\u00a0<\/span><\/p><h4><strong>Resistor Color Code<\/strong><\/h4><p><span data-contrast=\"auto\">Here\u2019s how to read the color bands on resistors:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p><ul><li><span data-contrast=\"auto\"><strong>220\u03a9<\/strong>: Red (2), Red (2), Brown (\u00d710) = 220\u03a9<\/span><\/li><li><span data-contrast=\"auto\"><strong>10k\u03a9<\/strong>: Brown (1), Black (0), Orange (\u00d71,000) = 10,000\u03a9<\/span><\/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-57ac050 elementor-widget elementor-widget-image\" data-id=\"57ac050\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/Testo-del-paragrafo-_3_-1024x576.webp\" class=\"attachment-large size-large wp-image-1891\" alt=\"\" srcset=\"https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/Testo-del-paragrafo-_3_-1024x576.webp 1024w, https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/Testo-del-paragrafo-_3_-300x169.webp 300w, https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/Testo-del-paragrafo-_3_-768x432.webp 768w, https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/Testo-del-paragrafo-_3_-1536x864.webp 1536w, https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/Testo-del-paragrafo-_3_-18x10.webp 18w, https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/Testo-del-paragrafo-_3_.webp 1920w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\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\u200bStep 3: Troubleshooting<\/span><\/b><span style=\"color: inherit; font-family: inherit; font-size: 2rem; text-wrap-mode: initial;\" data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:200,&quot;335559739&quot;:0}\">\u00a0<\/span><\/h3><p><strong>\u00a0<\/strong><\/p><h5><strong>LED does not light up:<\/strong><\/h5><ul><li><span data-contrast=\"auto\">Check the polarity of the LED (long leg to positive).<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li><li><span data-contrast=\"auto\">Make sure the resistor is not too high in value.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li><li><span data-contrast=\"auto\">Ensure the button is wired correctly and the code uses the correct pins.<\/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, we will learn how to control an LED using a push button connected to an Arduino Uno. We will also explore the use of resistors: how to choose them, their function, and how to read their color codes. \u00a0\ud83d\udcdd Required components 1 x Arduino Uno (or compatible board) Push button LED (any [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2066,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[68,69,43],"tags":[95,94,59,157,156,84,67,83,87,82,66,143,93,92,64],"class_list":["post-1888","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-electronics","category-tutorials","tag-adc","tag-analog","tag-arduino","tag-bounce","tag-button","tag-c","tag-complete","tag-cpp","tag-guide","tag-ide","tag-learn-by-doing","tag-led","tag-resistance","tag-resistor","tag-tutorial"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to turn on an LED using a button 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-a-button-with-arduino-2\/\" \/>\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, we will learn how to control an LED using a push button connected to an Arduino Uno. 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