{"id":3103,"date":"2017-03-01T23:47:08","date_gmt":"2017-03-01T22:47:08","guid":{"rendered":"https:\/\/dahoo.fr\/wordpress\/?p=3103"},"modified":"2017-03-06T21:20:50","modified_gmt":"2017-03-06T20:20:50","slug":"arduino-potentiometre-clignotement-dune-led","status":"publish","type":"post","link":"https:\/\/dahoo.fr\/wordpress\/arduino-potentiometre-clignotement-dune-led\/","title":{"rendered":"Arduino : Potentiom\u00e8tre et clignotement d&rsquo;une LED"},"content":{"rendered":"<p>Dans ce petit tutoriel tr\u00e8s court, on va voir comment r\u00e9cup\u00e9rer la valeur d&rsquo;un potentiom\u00e8tre et faire varier le clignotement d&rsquo;une LED proportionnellement \u00e0 sa valeur.<\/p>\n<p><!--more--><\/p>\n<p>Liste des composants:<\/p>\n<ul>\n<li>Un arduino<\/li>\n<li>Une LED<\/li>\n<li>Un potentiom\u00e8tre<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Projet disponible sur le hackLab \u00e0 cette <a href=\"https:\/\/hack.dahoo.fr\/\">adresse<\/a>\u00a0(Vous aurez ainsi la derni\u00e8re version et la coloration syntaxique) \u00a0\ud83d\ude00\u00a0.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u00a0\ud83d\udca1\u00a0Pour rappel,<\/strong> un\u00a0potentiom\u00e8tre est\u00a0une r\u00e9sistance variable.<\/p>\n<p>Le code est tr\u00e8s simple. On fait une lecture de la valeur du potentiom\u00e8tre qui est en analogique. \u00a0Puis, on active la LED de la valeur re\u00e7ue.<\/p>\n<p><strong>Exemple<\/strong>\u00a0: on re\u00e7oit\u00a05v, on va activer la LED 1023 \u00a0miliseconds, et l&rsquo;\u00e9teindre 1023 miliseconds. Hein ? Pourquoi 5V fais 1023 miliseconds ? Et bien, arduino divise la valeur 5v en 1023 valeur d&rsquo;\u00e9chantillonnage. Donc, 2.5V fait donc &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.. 1023\/ 2 soit 511 miliseconds. On a donc 1024 valeur \u00e9chantillonnage pour 5V.\u00a0<strong>Attention<\/strong> 5V et la valeur maximale d&rsquo;entr\u00e9e. Donc, plus la valeur sera \u00e9l\u00e9ment plus le d\u00e9lais sera grand. Et pourquoi 1024 valeur et pas 1023 ? Parce que l&rsquo;on fait (1023 + 0 = 1024 ). Oh mais oh petit gars,\u00a0tu te trompes l\u00e0 \u00e7a fait 1023\u00a0\u00a0\u00a0\ud83d\udc7f \u00a0Et ben non en informatique on commence \u00e0 compter \u00e0 partir de 0 =D.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Code<\/p>\n<p>[highlighter]<\/p>\n<pre>int potPin = 2; \/\/ pin d'entr\u00e9e de lecture du potentiom\u00e8tre\r\nint ledPin = 13; \/\/ Pin de sortie la LED\r\nint val = 0; \/\/ variable du potentiom\u00e8tre\r\n\r\nvoid setup() {\r\npinMode(ledPin, OUTPUT); \/\/ D\u00e9claration de la pin de la LED en sortie\r\nSerial.begin(9600); \/\/ Activation de la sortie serie\r\n}\r\n\r\nvoid loop() {\r\nval = analogRead(potPin); \/\/ lecture de la valeur du potentiom\u00e8tre\r\ndigitalWrite(ledPin, HIGH); \/\/ Active la sortie de la LED\r\ndelay(val); \/\/ Attente de la valeur recus\r\ndigitalWrite(ledPin, LOW); \/\/ D\u00e9sactivation de la sortie de la LED\r\ndelay(val); \/\/ Attente de la valeur re\u00e7us\r\n\r\nSerial.print(\"Valeur : \");\r\nSerial.print(val);\r\nSerial.println();\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Dans ce petit tutoriel tr\u00e8s court, on va voir comment r\u00e9cup\u00e9rer la valeur d&rsquo;un potentiom\u00e8tre et faire varier le clignotement d&rsquo;une LED proportionnellement \u00e0 sa valeur.<\/p>\n","protected":false},"author":1,"featured_media":2656,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[80],"tags":[247,293,208,368],"class_list":["post-3103","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-arduino","tag-arduino","tag-diy","tag-led","tag-potentiometre","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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