{"id":2242,"date":"2025-07-03T13:27:03","date_gmt":"2025-07-03T13:27:03","guid":{"rendered":"https:\/\/learnbydoing.dev\/?p=2242"},"modified":"2026-01-10T22:34:56","modified_gmt":"2026-01-10T22:34:56","slug":"how-to-use-a-photoresistor-ldr-with-arduino","status":"publish","type":"post","link":"https:\/\/learnbydoing.dev\/how-to-use-a-photoresistor-ldr-with-arduino\/","title":{"rendered":"How to use a Photoresistor (LDR) 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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    Photoresistors<\/strong>, also known as LDRs (Light Dependent Resistors)<\/strong>, are simple, inexpensive, and versatile light sensors. They detect the amount of light in the environment and are perfect for robotics, home automation, and DIY projects.<\/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\udcd1 How it Works<\/h3>

    A photoresistor<\/strong> is an electronic component whose resistance changes based on the light it receives:<\/p>

    • When light increases<\/strong>, its resistance decreases.<\/p><\/li>

    • When light decreases<\/strong>, its resistance increases.<\/p><\/li><\/ul>

      By connecting it to an Arduino through an analog input pin, we can read a numeric value between 0 and 1023<\/strong> that reflects the light level. This makes it ideal for automatic lighting, light-following robots, ambient light detection, and more.<\/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<\/h3>

      To build this project, you\u2019ll need:<\/p>

      • 1 \u00d7 Arduino Uno (or compatible board)<\/li>
      • 1 \u00d7 Photoresistor (LDR)<\/li>
      • 1 \u00d7 10 k\u03a9 resistor<\/li>
      • 1 \u00d7 LED<\/li>
      • 1 \u00d7 220 \u03a9 resistor (for the LED)<\/li>
      • Breadboard<\/li>
      • Jumper wires<\/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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        \ud83d\udd0c Wiring Diagram<\/h3>\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\udce6 Complete Arduino Code<\/h3>

        Here\u2019s the code\u00a0<\/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\t\/\/ Pin definitions\r\nint pinLDR = A0;\r\nint pinLED = 3;\r\n\r\nvoid setup() {\r\n  Serial.begin(9600);        \/\/ Start serial communication\r\n  pinMode(pinLED, OUTPUT);   \/\/ Set the LED pin as output\r\n}\r\n\r\nvoid loop() {\r\n  int lightValue = analogRead(pinLDR);  \/\/ Read light level\r\n  Serial.println(lightValue);           \/\/ Print value to Serial Monitor\r\n\r\n  if (lightValue < 500) {               \/\/ If light is below threshold\r\n    digitalWrite(pinLED, HIGH);         \/\/ Turn on the LED\r\n  } else {\r\n    digitalWrite(pinLED, LOW);          \/\/ Turn off the LED\r\n  }\r\n\r\n  delay(200);                           \/\/ Wait 200 ms\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-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<h5 data-start=\"1857\" data-end=\"1885\">Variable Declarations<\/h5><p data-start=\"3027\" data-end=\"3084\">We define two variables to associate Arduino pins with the components.<\/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>int pinLDR = A0;\r\nint pinLED = 13;\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-8141c6a elementor-widget elementor-widget-text-editor\" data-id=\"8141c6a\" 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<h5 data-start=\"1857\" data-end=\"1885\">Setup Function<\/h5>\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  Serial.begin(9600);\r\n  pinMode(pinLED, OUTPUT);\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-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=\"2828\" data-end=\"2891\">The <code data-start=\"2835\" data-end=\"2844\">setup()<\/code> function runs once when the Arduino powers up:<\/p><ul data-start=\"2892\" data-end=\"2975\"><li data-start=\"2892\" data-end=\"2935\"><p data-start=\"2894\" data-end=\"2935\">Starts serial communication at 9600 baud.<\/p><\/li><li data-start=\"2936\" data-end=\"2975\"><p data-start=\"2938\" data-end=\"2975\">Sets the LED pin as a digital output.<\/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-bdbed67 elementor-widget elementor-widget-text-editor\" data-id=\"bdbed67\" 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<h5 data-start=\"1857\" data-end=\"1885\">Main Loop<\/h5>\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-d361b1c elementor-widget elementor-widget-code-highlight\" data-id=\"d361b1c\" 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 loop() {\r\n  int lightValue = analogRead(pinLDR);\r\n  Serial.println(lightValue);<\/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>Continuously reads the analog value from pin <strong data-start=\"3124\" data-end=\"3130\">A0<\/strong> (0\u20131023) and prints it to the <strong data-start=\"3161\" data-end=\"3179\">Serial Monitor<\/strong>.<\/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-85beade elementor-widget elementor-widget-code-highlight\" data-id=\"85beade\" 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>if (lightValue < 500) {\r\n    digitalWrite(pinLED, HIGH);\r\n  } else {\r\n    digitalWrite(pinLED, LOW);\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-8c151f2 elementor-widget elementor-widget-text-editor\" data-id=\"8c151f2\" 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>If the light value is <strong data-start=\"3327\" data-end=\"3340\">below 500<\/strong> (dark environment), the LED turns on. Otherwise, it stays off.<br data-start=\"3403\" data-end=\"3406\" \/>You can adjust the <code data-start=\"3425\" data-end=\"3430\">500<\/code> threshold according to your environment and sensor sensitivity.<\/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-b11d22b elementor-widget elementor-widget-code-highlight\" data-id=\"b11d22b\" 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>  delay(200);\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-e7a0dfa elementor-widget elementor-widget-text-editor\" data-id=\"e7a0dfa\" 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>Pauses the program for <strong data-start=\"3554\" data-end=\"3574\">200 milliseconds<\/strong> before repeating the reading and control cycle.<\/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-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 data-start=\"3629\" data-end=\"3662\">\ud83d\udcca Interpreting Light Values<\/h3><ul data-start=\"3664\" data-end=\"3761\"><li data-start=\"3664\" data-end=\"3714\"><p data-start=\"3666\" data-end=\"3714\"><strong data-start=\"3666\" data-end=\"3693\">Low values (close to 0)<\/strong>: very bright light<\/p><\/li><li data-start=\"3715\" data-end=\"3761\"><p data-start=\"3717\" data-end=\"3761\"><strong data-start=\"3717\" data-end=\"3748\">High values (close to 1023)<\/strong>: low light<\/p><\/li><\/ul><p data-start=\"3763\" data-end=\"3824\">The threshold value of 500 can be changed to suit your needs.<\/p>\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>Photoresistors, also known as LDRs (Light Dependent Resistors), are simple, inexpensive, and versatile light sensors. They detect the amount of light in the environment and are perfect for robotics, home automation, and DIY projects. \ud83d\udcd1 How it Works A photoresistor is an electronic component whose resistance changes based on the light it receives: When light [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":2284,"comment_status":"closed","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[68,69,43],"tags":[95,94,59,84,67,83,87,82,144,66,143,145,146,142,93,92,64],"class_list":["post-2242","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-electronics","category-tutorials","tag-adc","tag-analog","tag-arduino","tag-c","tag-complete","tag-cpp","tag-guide","tag-ide","tag-ldr","tag-learn-by-doing","tag-led","tag-light","tag-night","tag-photoresistor","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 use a Photoresistor (LDR) 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-photoresistor-ldr-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=\"Photoresistors, also known as LDRs (Light Dependent Resistors), are simple, inexpensive, and versatile light sensors. 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