{"id":2357,"date":"2025-07-05T09:55:32","date_gmt":"2025-07-05T09:55:32","guid":{"rendered":"https:\/\/learnbydoing.dev\/?p=2357"},"modified":"2026-01-21T18:29:52","modified_gmt":"2026-01-21T18:29:52","slug":"how-to-use-humidity-sensor-with-arduino","status":"publish","type":"post","link":"https:\/\/learnbydoing.dev\/how-to-use-humidity-sensor-with-arduino\/","title":{"rendered":"How to use humidity sensor 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, you will learn how to use a basic analog soil moisture sensor with an Arduino Uno to measure soil humidity. Instead of using a digital humidity sensor, we will power the analog sensor selectively to reduce corrosion, read the moisture level, and visually represent it using 5 LEDs ranging from dry to wet soil conditions.<\/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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    \u00a0\ud83d\udcdd Required components<\/span><\/span><\/span><\/span><\/h3>
    • Arduino Uno<\/span><\/li>
    • Analog Soil Moisture Sensor<\/li>
    • 5 LEDs (any color)<\/li>
    • 1 \u00d7 220\u03a9 resistors (for LEDs)<\/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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      Step 1: wiring the electronics<\/span><\/span><\/span><\/b><\/h3>
      1. Connect the sensor\u2019s VCC to Arduino pin A0.<\/span><\/li>
      2. Connect the sensor\u2019s GND to Arduino GND.<\/span><\/li>
      3. Connect the sensor\u2019s analog OUT to Arduino pin A1.<\/span><\/li>
      4. Connect each LED (via 220\u03a9 resistor) to Arduino pins 8 to 12:<\/span><\/li><\/ol>
          • Pin 8 \u2192 Very Dry<\/span><\/li>
          • Pin 9 \u2192 Dry<\/span><\/li>
          • Pin 10 \u2192 Moderate<\/span><\/li>
          • Pin 11 \u2192 Moist<\/span><\/li>
          • Pin 12 \u2192 Very Wet<\/span><\/li><\/ul><\/li><\/ul>
            1. All LED cathodes connect to GND.<\/span><\/li><\/ol>


              <\/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\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\t\/\/ C++ code\r\n\/\/\r\nint moisture = 0;\r\n\r\nvoid setup()\r\n{\r\n  pinMode(A0, OUTPUT);\r\n  pinMode(A1, INPUT);\r\n  Serial.begin(9600);\r\n  pinMode(8, OUTPUT);\r\n  pinMode(9, OUTPUT);\r\n  pinMode(10, OUTPUT);\r\n  pinMode(11, OUTPUT);\r\n  pinMode(12, OUTPUT);\r\n}\r\n\r\nvoid loop()\r\n{\r\n  \/\/ Apply power to the soil moisture sensor\r\n  digitalWrite(A0, HIGH);\r\n  delay(10); \/\/ Wait for 10 millisecond(s)\r\n  moisture = analogRead(A1);\r\n  \/\/ Turn off the sensor to reduce metal corrosion\r\n  \/\/ over time\r\n  digitalWrite(A0, LOW);\r\n  Serial.println(moisture);\r\n  digitalWrite(8, LOW);\r\n  digitalWrite(9, LOW);\r\n  digitalWrite(10, LOW);\r\n  digitalWrite(11, LOW);\r\n  digitalWrite(12, LOW);\r\n  if (moisture < 200) {\r\n    digitalWrite(12, HIGH);\r\n  } else {\r\n    if (moisture < 400) {\r\n      digitalWrite(11, HIGH);\r\n    } else {\r\n      if (moisture < 600) {\r\n        digitalWrite(10, HIGH);\r\n      } else {\r\n        if (moisture < 800) {\r\n          digitalWrite(9, HIGH);\r\n        } else {\r\n          digitalWrite(8, HIGH);\r\n        }\r\n      }\r\n    }\r\n  }\r\n  delay(100); \/\/ Wait for 100 millisecond(s)\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>int moisture = 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-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>Declares a variable to store the soil moisture value read from the sensor.<\/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>void setup() {\r\n  pinMode(A0, OUTPUT);     \/\/ Power pin for the sensor\r\n  pinMode(A1, INPUT);      \/\/ Analog signal input from the sensor\r\n  Serial.begin(9600);      \/\/ Start Serial Monitor\r\n  pinMode(8, OUTPUT);      \/\/ LED for very dry\r\n  pinMode(9, OUTPUT);      \/\/ LED for dry\r\n  pinMode(10, OUTPUT);     \/\/ LED for medium\r\n  pinMode(11, OUTPUT);     \/\/ LED for moist\r\n  pinMode(12, OUTPUT);     \/\/ LED for very wet\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-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\">Sets pin <code data-start=\"1025\" data-end=\"1029\">A0<\/code> as output to control power to the sensor.<\/li><li data-start=\"1074\" data-end=\"1108\">Reads the sensor signal from <code data-start=\"1103\" data-end=\"1107\">A1<\/code>.<\/li><li data-start=\"1111\" data-end=\"1182\">Initializes 5 digital pins for controlling the moisture indicator LEDs.<\/li><li data-start=\"1185\" data-end=\"1241\">Starts serial communication for debugging or monitoring.<\/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>  digitalWrite(A0, HIGH);       \/\/ Turn on the sensor\r\n  delay(10);                    \/\/ Wait 10 ms to stabilize\r\n  moisture = analogRead(A1);    \/\/ Read analog value from the sensor\r\n  digitalWrite(A0, LOW);        \/\/ Turn off sensor to prevent corrosion\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\">The sensor is powered briefly just before taking a reading.<\/li><li data-start=\"1598\" data-end=\"1623\">Analog values range from:<strong data-start=\"1628\" data-end=\"1639\">0 (wet)<\/strong> to <strong data-start=\"1643\" data-end=\"1657\">1023 (dry)<\/strong>.<\/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>  Serial.println(moisture);\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\"><p data-start=\"1339\" data-end=\"1368\">Sends the moisture value to the Serial Monitor so you can see live readings.<\/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-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>  digitalWrite(8, LOW);\r\n  digitalWrite(9, LOW);\r\n  digitalWrite(10, LOW);\r\n  digitalWrite(11, LOW);\r\n  digitalWrite(12, 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-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\"><p data-start=\"1339\" data-end=\"1368\">All LEDs are turned off before updating the current state.<\/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-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>  if (moisture < 200) {\r\n    digitalWrite(12, HIGH);     \/\/ Very wet\r\n  } else if (moisture < 400) {\r\n    digitalWrite(11, HIGH);     \/\/ Moist\r\n  } else if (moisture < 600) {\r\n    digitalWrite(10, HIGH);     \/\/ Medium\r\n  } else if (moisture < 800) {\r\n    digitalWrite(9, HIGH);      \/\/ Dry\r\n  } else {\r\n    digitalWrite(8, HIGH);      \/\/ Very dry\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-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\">Depending on the sensor value, only one LED turns on to indicate the moisture level.<\/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-f5e1f57 elementor-widget elementor-widget-code-highlight\" data-id=\"f5e1f57\" 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(100);\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<ul><li data-start=\"1830\" data-end=\"1890\"><p data-start=\"1567\" data-end=\"1605\">Adds a short pause between readings to stabilize behavior and avoid flooding the Serial Monitor.<\/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>Sensor always reads the same value:<\/strong><\/p><ul><li><span data-contrast=\"auto\"> Check that A0 powers the sensor briefly and that A1 is connected correctly.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li><\/ul><p>\u00a0<\/p><p><strong>LEDs never light up:<\/strong><\/p><ul><li><span data-contrast=\"auto\"> Make sure the cathodes are connected to GND and you use current-limiting resistors.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li><\/ul><p>\u00a0<\/p><p><span data-contrast=\"auto\"><strong>Moisture readings seem inverted:<\/strong><\/span><\/p><ul><li><span data-contrast=\"auto\"> Try watering the soil and compare changes in the serial monitor.<\/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 will learn how to use a basic analog soil moisture sensor with an Arduino Uno to measure soil humidity. Instead of using a digital humidity sensor, we will power the analog sensor selectively to reduce corrosion, read the moisture level, and visually represent it using 5 LEDs ranging from dry to [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2378,"comment_status":"closed","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[68,69,43],"tags":[95,94,59,84,67,109,83,154,183,87,184,82,155,161,66,91,93,92,162,64],"class_list":["post-2357","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-control","tag-cpp","tag-dc","tag-dht11","tag-guide","tag-humidity","tag-ide","tag-insulated","tag-ldc","tag-learn-by-doing","tag-potentiometer","tag-resistance","tag-resistor","tag-screen","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 humidity sensor 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-humidity-sensor-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 will learn how to use a basic analog soil moisture sensor with an Arduino Uno to measure soil humidity. 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