{"id":2169,"date":"2025-07-01T13:21:00","date_gmt":"2025-07-01T13:21:00","guid":{"rendered":"https:\/\/learnbydoing.dev\/?p=2169"},"modified":"2026-01-10T22:35:42","modified_gmt":"2026-01-10T22:35:42","slug":"how-to-use-rpi-sensor-with-arduino","status":"publish","type":"post","link":"https:\/\/learnbydoing.dev\/how-to-use-rpi-sensor-with-arduino\/","title":{"rendered":"How to use RPI 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 PIR (Passive Infrared) motion sensor with an Arduino Uno to detect motion. When motion is detected, an LED will turn on. This is a common setup for simple motion-activated alerts or indicators.<\/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><\/h3>

    • Arduino Uno<\/span><\/span><\/strong>\u00a0<\/span><\/span><\/p><\/li>

    • PIR Motion Sensor<\/span><\/span><\/strong><\/li>
    • LED (any color)<\/span><\/span><\/strong><\/li>
    • 220\u03a9 resistor (for the LED)<\/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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      How the PIR Sensor Works<\/span><\/span>\u00a0<\/span><\/strong><\/h3>

      The PIR sensor detects infrared radiation emitted by warm bodies (like humans or animals). When it senses motion, the sensor outputs a HIGH signal through its OUT pin. This signal can then be used to control other components like LEDs, buzzers, or relays.<\/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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      Step 1: Wiring the Electronics<\/span><\/b>\u00a0<\/span><\/h3>

      1. Connect the VCC pin of the PIR sensor to the 5V pin on the Arduino.<\/span><\/span>\u00a0<\/span>
      <\/span>2. Connect the GND pin of the PIR sensor to the Arduino GND.<\/span><\/span>\u00a0<\/span>
      <\/span>3. Connect the OUT pin of the PIR sensor to digital pin 7 on the Arduino.<\/span><\/span>\u00a0<\/span>
      <\/span>4. Connect the anode (long leg) of the LED to digital pin 13 through a 220\u03a9 resistor.<\/span><\/span>\u00a0<\/span>
      <\/span>5. Connect the cathode (short leg) of the LED to GND.<\/span><\/span>\u00a0<\/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\ufe0fStep 2: Writing the Code<\/span><\/b>\u00a0<\/span><\/h3>

      Below you will find the complete code to use the rip 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 \r\nconst int pirPin = 7;        \/\/ PIR sensor output pin \r\nconst int ledPin = 13;       \/\/ LED connected to pin 13 \r\n \r\nvoid setup() { \r\n  pinMode(pirPin, INPUT);    \/\/ Set PIR pin as input \r\n  pinMode(ledPin, OUTPUT);   \/\/ Set LED pin as output \r\n  Serial.begin(9600);        \/\/ Start serial monitor \r\n} \r\n \r\nvoid loop() { \r\n  int motion = digitalRead(pirPin); \r\n \r\n  if (motion == HIGH) { \r\n    digitalWrite(ledPin, HIGH);    \/\/ Turn on LED \r\n    Serial.println(\"Motion detected!\"); \r\n  } else { \r\n    digitalWrite(ledPin, LOW);     \/\/ Turn off LED \r\n    Serial.println(\"No motion.\"); \r\n  } \r\n \r\n  delay(200); \/\/ small delay to avoid flooding the serial output \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&nbsp;<\/b><b>Breaking down the Code<\/b><\/h3>\n<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>const int pirPin = 7;        \/\/ PIR sensor output pin\r\nconst int ledPin = 13;       \/\/ LED connected to pin 13<\/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 data-start=\"311\" data-end=\"367\"><p data-start=\"311\" data-end=\"365\">These two lines declare <strong data-start=\"338\" data-end=\"351\">constants<\/strong> for the pins:<\/p><ul data-start=\"366\" data-end=\"508\"><li data-start=\"366\" data-end=\"422\"><p data-start=\"368\" data-end=\"422\"><code data-start=\"368\" data-end=\"376\">pirPin<\/code> is connected to the output of the PIR sensor.<\/p><\/li><li data-start=\"423\" data-end=\"508\"><p data-start=\"425\" data-end=\"508\"><code data-start=\"425\" data-end=\"433\">ledPin<\/code> is connected to the LED (usually the built-in LED on many Arduino boards).<\/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-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(pirPin, INPUT);    \/\/ Set PIR pin as input\r\n  pinMode(ledPin, OUTPUT);   \/\/ Set LED pin as output\r\n  Serial.begin(9600);        \/\/ Start serial monitor\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=\"711\" data-end=\"790\"><p data-start=\"633\" data-end=\"680\">The <code data-start=\"640\" data-end=\"649\">setup()<\/code> function runs once at startup:<\/p><ul data-start=\"681\" data-end=\"894\"><li data-start=\"681\" data-end=\"744\"><p data-start=\"683\" data-end=\"744\"><code data-start=\"683\" data-end=\"707\">pinMode(pirPin, INPUT)<\/code> sets pin 7 as input to read the PIR.<\/p><\/li><li data-start=\"745\" data-end=\"814\"><p data-start=\"747\" data-end=\"814\"><code data-start=\"747\" data-end=\"772\">pinMode(ledPin, OUTPUT)<\/code> sets pin 13 as output to control the LED.<\/p><\/li><li data-start=\"815\" data-end=\"894\"><p data-start=\"817\" data-end=\"894\"><code data-start=\"817\" data-end=\"837\">Serial.begin(9600)<\/code> initializes serial communication for debugging messages.<\/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-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>void loop() {\r\n  int motion = digitalRead(pirPin);<\/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=\"1128\" data-end=\"1196\"><p data-start=\"962\" data-end=\"1045\">The <code data-start=\"969\" data-end=\"977\">loop()<\/code> runs continuously.<br data-start=\"996\" data-end=\"999\" \/>Here we read the <strong data-start=\"1016\" data-end=\"1044\">status of the PIR sensor<\/strong>:<\/p><ul data-start=\"1046\" data-end=\"1136\"><li data-start=\"1046\" data-end=\"1108\"><p data-start=\"1048\" data-end=\"1108\">If motion is detected, <code data-start=\"1071\" data-end=\"1092\">digitalRead(pirPin)<\/code> returns <code data-start=\"1101\" data-end=\"1107\">HIGH<\/code>.<\/p><\/li><li data-start=\"1109\" data-end=\"1136\"><p data-start=\"1111\" data-end=\"1136\">If not, it returns <code data-start=\"1130\" data-end=\"1135\">LOW<\/code>.<\/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-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> if (motion == HIGH) {\r\n    digitalWrite(ledPin, HIGH);    \/\/ Turn on LED\r\n    Serial.println(\"Motion detected!\");\r\n  } else {\r\n    digitalWrite(ledPin, LOW);     \/\/ Turn off LED\r\n    Serial.println(\"No motion.\");\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\">If <strong data-start=\"1345\" data-end=\"1367\">motion is detected<\/strong>:<\/p><ul data-start=\"1369\" data-end=\"1443\"><li data-start=\"1369\" data-end=\"1397\"><p data-start=\"1371\" data-end=\"1397\">The LED turns on (<code data-start=\"1389\" data-end=\"1395\">HIGH<\/code>).<\/p><\/li><li data-start=\"1398\" data-end=\"1443\"><p data-start=\"1400\" data-end=\"1443\">A message is printed in the Serial Monitor.<\/p><\/li><\/ul><p data-start=\"1445\" data-end=\"1465\">\u00a0If <strong data-start=\"1451\" data-end=\"1464\">no motion<\/strong>:<\/p><ul data-start=\"1466\" data-end=\"1533\"><li data-start=\"1466\" data-end=\"1494\"><p data-start=\"1468\" data-end=\"1494\">The LED turns off (<code data-start=\"1487\" data-end=\"1492\">LOW<\/code>).<\/p><\/li><li data-start=\"1495\" data-end=\"1533\"><p data-start=\"1497\" data-end=\"1533\">The message \u201cNo motion.\u201d is printed.<\/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> delay(200); \/\/ small delay to avoid flooding the serial 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<ul><li data-start=\"1830\" data-end=\"1890\"><p data-start=\"1567\" data-end=\"1605\">A short delay (200 ms) is added to:<\/p><ul data-start=\"1606\" data-end=\"1739\"><li data-start=\"1606\" data-end=\"1658\"><p data-start=\"1608\" data-end=\"1658\">Prevent flooding the Serial Monitor with messages.<\/p><\/li><li data-start=\"1659\" data-end=\"1739\"><p data-start=\"1661\" data-end=\"1739\">Stabilize the PIR reading, since it stays HIGH briefly after detecting motion.<\/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-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 aria-level=\"2\"><b><span data-contrast=\"none\">Common Applications<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:200,&quot;335559739&quot;:0}\">\u00a0<\/span><\/h4><ul><li><span data-contrast=\"auto\"> Motion-activated lighting<\/span><\/li><li><span data-contrast=\"auto\"> Security systems<\/span><\/li><li><span data-contrast=\"auto\"> Automatic alert or alarm systems<\/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-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<p><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><\/p><p><strong>\u00a0<\/strong><\/p><p><strong>The LED stays ON:<\/strong><\/p><ul><li><p><span data-contrast=\"auto\">The sensor might be detecting motion continuously.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p><\/li><li><p><span data-contrast=\"auto\">Reduce sensor sensitivity using the onboard potentiometer.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p><\/li><\/ul><p>\u00a0<\/p><p><strong>The LED never turns ON:<\/strong><\/p><ul><li><p><span data-contrast=\"auto\">Check the wiring and power supply.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p><\/li><li><p><span data-contrast=\"auto\">Verify that the PIR sensor is working and properly aligned.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p><\/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<div class=\"elementor-element elementor-element-0076cc1 e-flex e-con-boxed e-con e-parent\" data-id=\"0076cc1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\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 PIR (Passive Infrared) motion sensor with an Arduino Uno to detect motion. When motion is detected, an LED will turn on. This is a common setup for simple motion-activated alerts or indicators.\u00a0 \u00a0\ud83d\udcdd Required components Arduino Uno\u00a0 PIR Motion Sensor LED (any color) 220\u03a9 resistor [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2228,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[68,69,43],"tags":[95,94,59,84,67,83,148,151,87,82,149,66,93,92,147,150,64],"class_list":["post-2169","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-detection","tag-device","tag-guide","tag-ide","tag-intruder","tag-learn-by-doing","tag-resistance","tag-resistor","tag-rpi","tag-security","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 RPI 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-rpi-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 PIR (Passive Infrared) motion sensor with an Arduino Uno to detect motion. When motion is detected, an LED will turn on. 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