{"id":17375,"date":"2025-03-01T23:52:45","date_gmt":"2025-03-01T23:52:45","guid":{"rendered":"https:\/\/edukeytech.com\/?post_type=product&#038;p=17375"},"modified":"2025-03-01T23:52:45","modified_gmt":"2025-03-01T23:52:45","slug":"capteur-de-lumiere-a-photoresistance-ldr-5mm","status":"publish","type":"product","link":"https:\/\/edukeytech.com\/en\/product\/capteur-de-lumiere-a-photoresistance-ldr-5mm\/","title":{"rendered":"Capteur de Lumi\u00e8re \u00e0 Photor\u00e9sistance LDR 5mm"},"content":{"rendered":"<p><strong>Capteur de Lumi\u00e8re \u00e0 Photor\u00e9sistance LDR 5mm (GL5549)<\/strong><\/p>\n<p><strong>Introduction<\/strong><\/p>\n<p><strong>La photor\u00e9sistance LDR (Light Dependent Resistor) GL5549 est un capteur de lumi\u00e8re sensible aux variations d&rsquo;intensit\u00e9 lumineuse. Utilisant le principe de la photoconductivit\u00e9, sa r\u00e9sistance diminue en pr\u00e9sence de lumi\u00e8re et augmente dans l&rsquo;obscurit\u00e9. Ce composant est largement utilis\u00e9 dans les syst\u00e8mes de d\u00e9tection de lumi\u00e8re, l&rsquo;automatisation et les circuits de commande d&rsquo;\u00e9clairage.<\/strong><\/p>\n<p><strong>Caract\u00e9ristiques Techniques<\/strong><\/p>\n<ul>\n<li><strong>Dimensions : 5mm<\/strong><\/li>\n<li><strong>R\u00e9sistance \u00e0 10 Lux : 8-20 k\u03a9<\/strong><\/li>\n<li><strong>R\u00e9sistance dans l&rsquo;obscurit\u00e9 : jusqu&rsquo;\u00e0 500 k\u03a9<\/strong><\/li>\n<li><strong>Tension maximale : 150V DC<\/strong><\/li>\n<li><strong>Puissance maximale : 90mW<\/strong><\/li>\n<li><strong>Plage de temp\u00e9rature de fonctionnement : -30\u00b0C \u00e0 +70\u00b0C<\/strong><\/li>\n<li><strong>Longueur d&rsquo;onde de pic : 540 nm<\/strong><\/li>\n<li><strong>Temps de r\u00e9ponse : 20ms (mont\u00e9e), 30ms (descente)<\/strong><\/li>\n<li><strong>Mat\u00e9riau : Sulfure de cadmium (CdS)<\/strong><\/li>\n<\/ul>\n<p><strong>Principe de Fonctionnement<\/strong><\/p>\n<p><strong>La photor\u00e9sistance LDR fonctionne sur le principe de la photoconductivit\u00e9. Lorsqu&rsquo;elle est expos\u00e9e \u00e0 la lumi\u00e8re, les \u00e9lectrons du mat\u00e9riau semi-conducteur absorbent l&rsquo;\u00e9nergie des photons, r\u00e9duisant ainsi la r\u00e9sistance \u00e9lectrique. \u00c0 l&rsquo;inverse, dans l&rsquo;obscurit\u00e9, les \u00e9lectrons retournent \u00e0 leur \u00e9tat initial, augmentant la r\u00e9sistance.<\/strong><\/p>\n<p><strong>Applications<\/strong><\/p>\n<ul>\n<li><strong>Syst\u00e8mes d&rsquo;\u00e9clairage automatique<\/strong><\/li>\n<li><strong>Capteurs de luminosit\u00e9 pour cam\u00e9ras et smartphones<\/strong><\/li>\n<li><strong>D\u00e9tecteurs de cr\u00e9puscule et de pr\u00e9sence<\/strong><\/li>\n<li><strong>Automatisation des serres agricoles<\/strong><\/li>\n<li><strong>Syst\u00e8mes de s\u00e9curit\u00e9 et alarmes sensibles \u00e0 la lumi\u00e8re<\/strong><\/li>\n<li><strong>Contr\u00f4le de luminosit\u00e9 pour dispositifs \u00e9lectroniques<\/strong><\/li>\n<\/ul>\n<p><strong>Brochage<\/strong><\/p>\n<p><strong>La photor\u00e9sistance LDR dispose de deux broches sans polarit\u00e9, pouvant \u00eatre connect\u00e9es indiff\u00e9remment. Une broche est reli\u00e9e \u00e0 l&rsquo;alimentation (\u00e0 travers une r\u00e9sistance de pull-down de 10k\u03a9), l&rsquo;autre est connect\u00e9e \u00e0 la masse (GND).<\/strong><\/p>\n<p><strong>Utilisation avec Arduino Uno<\/strong><\/p>\n<p><strong>Exemple de Code Arduino de Base<\/strong><\/p>\n<p><strong>const int ldrPin = A0; \/\/ Broche analogique pour la photor\u00e9sistance<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>void setup() {<\/strong><\/p>\n<p><strong>\u00a0 Serial.begin(9600);<\/strong><\/p>\n<p><strong>}<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>void loop() {<\/strong><\/p>\n<p><strong>\u00a0 int ldrValue = analogRead(ldrPin);<\/strong><\/p>\n<p><strong>\u00a0 Serial.print(\u00ab\u00a0LDR value: \u00ab\u00a0);<\/strong><\/p>\n<p><strong>\u00a0 <\/strong><strong>Serial.println(ldrValue);<\/strong><\/p>\n<p><strong>\u00a0 delay(500);<\/strong><\/p>\n<p><strong>}<\/strong><\/p>\n<p><strong>Mat\u00e9riel Requis<\/strong><\/p>\n<ul>\n<li><strong>Arduino Uno<\/strong><\/li>\n<li><strong>LDR 5mm<\/strong><\/li>\n<li><strong>R\u00e9sistance de 10k\u03a9<\/strong><\/li>\n<li><strong>C\u00e2bles de connexion<\/strong><\/li>\n<\/ul>\n<p><strong>Explication du Code<\/strong><\/p>\n<ul>\n<li><strong>D\u00e9finition de la broche : LDR connect\u00e9e \u00e0 A0<\/strong><\/li>\n<li><strong>Lecture analogique : Obtention de la valeur de r\u00e9sistance en fonction de la lumi\u00e8re<\/strong><\/li>\n<li><strong>Affichage sur le moniteur s\u00e9rie : Permet de visualiser l&rsquo;intensit\u00e9 lumineuse<\/strong><\/li>\n<li><strong>Attente de 500ms avant la lecture suivante<\/strong><\/li>\n<\/ul>\n<p><strong>Brochage Arduino<\/strong><\/p>\n<ul>\n<li><strong>Une broche de la LDR : Connect\u00e9e \u00e0 5V Arduino<\/strong><\/li>\n<li><strong>Autre broche de la LDR : Connect\u00e9e \u00e0 A0 et \u00e0 une r\u00e9sistance de 10k\u03a9 reli\u00e9e \u00e0 GND<\/strong><\/li>\n<\/ul>\n<p><strong>Exemple Avanc\u00e9 : Affichage sur LCD I2C<\/strong><\/p>\n<p><strong>#include &lt;Wire.h&gt;<\/strong><\/p>\n<p><strong>#include &lt;LiquidCrystal_I2C.h&gt;<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>const int ldrPin = A0;<\/strong><\/p>\n<p><strong>LiquidCrystal_I2C lcd(0x27, 16, 2);<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>void setup() {<\/strong><\/p>\n<p><strong>\u00a0 lcd.begin();<\/strong><\/p>\n<p><strong>\u00a0 lcd.backlight();<\/strong><\/p>\n<p><strong>\u00a0 Serial.begin(9600);<\/strong><\/p>\n<p><strong>}<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>void loop() {<\/strong><\/p>\n<p><strong>\u00a0 int ldrValue = analogRead(ldrPin);<\/strong><\/p>\n<p><strong>\u00a0 <\/strong><strong>lcd.setCursor(0, 0);<\/strong><\/p>\n<p><strong>\u00a0 lcd.print(\u00ab\u00a0Luminosite: \u00ab\u00a0);<\/strong><\/p>\n<p><strong>\u00a0 <\/strong><strong>lcd.print(ldrValue);<\/strong><\/p>\n<p><strong>\u00a0 Serial.print(\u00ab\u00a0LDR value: \u00ab\u00a0);<\/strong><\/p>\n<p><strong>\u00a0 <\/strong><strong>Serial.println(ldrValue);<\/strong><\/p>\n<p><strong>\u00a0 delay(500);<\/strong><\/p>\n<p><strong>}<\/strong><\/p>\n<p><strong>Mat\u00e9riel Requis<\/strong><\/p>\n<ul>\n<li><strong>Arduino Uno<\/strong><\/li>\n<li><strong>LDR 5mm<\/strong><\/li>\n<li><strong>R\u00e9sistance 10k\u03a9<\/strong><\/li>\n<li><strong>\u00c9cran LCD I2C 1602<\/strong><\/li>\n<li><strong>C\u00e2bles de connexion<\/strong><\/li>\n<\/ul>\n<p><strong>Explication du Code<\/strong><\/p>\n<ul>\n<li><strong>Lecture analogique : Conversion de l&rsquo;intensit\u00e9 lumineuse en valeur utilisable<\/strong><\/li>\n<li><strong>Affichage sur LCD : Valeur actualis\u00e9e en temps r\u00e9el<\/strong><\/li>\n<li><strong>Communication s\u00e9rie : Transmission des donn\u00e9es via le moniteur s\u00e9rie<\/strong><\/li>\n<\/ul>\n<p><strong>Brochage LCD avec Arduino<\/strong><\/p>\n<ul>\n<li><strong>SDA (LCD) : A4 (Arduino)<\/strong><\/li>\n<li><strong>SCL (LCD) : A5 (Arduino)<\/strong><\/li>\n<\/ul>\n<p><strong>Installation de Biblioth\u00e8ques<\/strong><\/p>\n<p><strong>Pour utiliser le capteur avec un LCD I2C, installez les biblioth\u00e8ques via l&rsquo;IDE Arduino :<\/strong><\/p>\n<ol>\n<li><strong>h (communication I2C)<\/strong><\/li>\n<li><strong>h (affichage LCD I2C)<\/strong><\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p><strong>La photor\u00e9sistance LDR (Light Dependent Resistor) GL5549 est un capteur de lumi\u00e8re sensible aux variations d&rsquo;intensit\u00e9 lumineuse. <\/strong><\/p>","protected":false},"featured_media":17377,"comment_status":"open","ping_status":"closed","template":"","meta":{"_joinchat":[]},"product_brand":[],"product_cat":[161],"product_tag":[],"class_list":["post-17375","product","type-product","status-publish","has-post-thumbnail","product_cat-capteurs","first","instock","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/product\/17375","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/comments?post=17375"}],"version-history":[{"count":1,"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/product\/17375\/revisions"}],"predecessor-version":[{"id":17378,"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/product\/17375\/revisions\/17378"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/media\/17377"}],"wp:attachment":[{"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/media?parent=17375"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/product_brand?post=17375"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/product_cat?post=17375"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/edukeytech.com\/en\/wp-json\/wp\/v2\/product_tag?post=17375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}