{"id":1159,"date":"2025-05-04T21:25:30","date_gmt":"2025-05-04T19:25:30","guid":{"rendered":"https:\/\/www.du-man.net\/wordpress\/?p=1159"},"modified":"2025-05-05T16:41:10","modified_gmt":"2025-05-05T14:41:10","slug":"chrono-vdr-chronometrage-electronique-dune-course","status":"publish","type":"post","link":"https:\/\/www.du-man.net\/wordpress\/chrono-vdr-chronometrage-electronique-dune-course\/","title":{"rendered":"chrono.vdr : Chronom\u00e9trage \u00e9lectronique d&rsquo;une course."},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>Projet lanc\u00e9 avec les classes de 4\u1d49 : comment automatiser le chronom\u00e9trage d&rsquo;une course d&rsquo;endurance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1 &#8211; La technique<\/h3>\n\n\n\n<p>La solution retenue a \u00e9t\u00e9 d&rsquo;utiliser la technologie RFID.<br>Sur chaque couloir de chronom\u00e9trage, un module de chronom\u00e9trage compos\u00e9 de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Une carte Micro:bit<\/li>\n\n\n\n<li>Un shield pour la carte Micro:bit &#8211; 6,8\u20ac<\/li>\n\n\n\n<li>Un capteur RFID rc522 &#8211; 2\u20ac<\/li>\n\n\n\n<li>Une batterie de r\u00e9cup\u00e9ration<\/li>\n\n\n\n<li>Un support d&rsquo;alimentation pour cette batterie &#8211; 2\u20ac<\/li>\n<\/ul>\n\n\n\n<p>Le boitier \u00e9tant ouvert, la carte Micro:bit est amovible, ce qui r\u00e9duit consid\u00e9rablement le co\u00fbt de chaque boitier.<\/p>\n\n\n\n<p>Avec cette configuration, le module de chronom\u00e9trage a une autonomie de presque 24h<\/p>\n\n\n\n<p>Le boitier <strong>chrono.vdr<\/strong> est aliment\u00e9 par 4 batteries, ce qui lui donne une autonomie de 12h.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2 &#8211; Le fonctionnement<\/h3>\n\n\n\n<p>6 couloirs de chronom\u00e9trage ont \u00e9t\u00e9 utilis\u00e9 pour 170 \u00e9l\u00e8ves qui ont effectu\u00e9 entre 5 et 18 tours en 30min<\/p>\n\n\n\n<p>Chaque module d\u00e9tecte la pr\u00e9sence d&rsquo;un badge RFID port\u00e9 au creux de la main par chaque \u00e9l\u00e8ve. Un signal radio est envoy\u00e9 au boitier <strong>chrono.vdr<\/strong> pour enregistrer le temps et comptabiliser le nombre de passages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3 &#8211; Les probl\u00e8mes<\/h3>\n\n\n\n<p>Lors des premiers tests, <strong>certaines donn\u00e9es envoy\u00e9es <\/strong>par les modules de chronom\u00e9trage n&rsquo;\u00e9taient pas enregistr\u00e9es sur le Raspberry PI (5%).<\/p>\n\n\n\n<p><strong>Une boucle a \u00e9t\u00e9 rajout\u00e9e<\/strong> dans le programme du module de chronom\u00e9trage pour<strong> envoyer plusieurs fois la donn\u00e9e<\/strong>, jusqu&rsquo;\u00e0 obtention de l&rsquo;accus\u00e9 de r\u00e9ception.<br>C&rsquo;est une piste int\u00e9ressante de travail avec les \u00e9l\u00e8ves autour de la notion de protocole de transmission.<\/p>\n\n\n\n<p>Il est tr\u00e8s difficile de se rendre compte de ce que repr\u00e9sente une telle avalanche d&rsquo;enregistrement pendant 30 minutes !<br>L&rsquo;affichage des donn\u00e9es a d\u00fb \u00eatre s\u00e9rieusement optimis\u00e9 pour garder une certaine fluidit\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4 &#8211; Bilan<\/h3>\n\n\n\n<p>Bilan tr\u00e8s positif :<br>Plus de 2000 donn\u00e9es ont \u00e9t\u00e9 enregistr\u00e9es en 30min (1800 secondes). <\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.png\" alt=\"\" class=\"wp-image-1160\" width=\"507\" height=\"285\" srcset=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.png 1000w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_-300x169.png 300w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_-768x432.png 768w\" sizes=\"auto, (max-width: 507px) 100vw, 507px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.bracelet.jpg\" alt=\"\" class=\"wp-image-1164\" width=\"483\" height=\"379\" srcset=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.bracelet.jpg 800w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.bracelet-300x236.jpg 300w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.bracelet-768x603.jpg 768w\" sizes=\"auto, (max-width: 483px) 100vw, 483px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.arbitrage.jpg\" alt=\"\" class=\"wp-image-1161\" width=\"591\" height=\"343\" srcset=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.arbitrage.jpg 836w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.arbitrage-300x174.jpg 300w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.arbitrage-768x446.jpg 768w\" sizes=\"auto, (max-width: 591px) 100vw, 591px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.arbitrage2.jpg\" alt=\"\" class=\"wp-image-1162\" width=\"575\" height=\"417\" srcset=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.arbitrage2.jpg 882w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.arbitrage2-300x217.jpg 300w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/chrono.vdr_.arbitrage2-768x556.jpg 768w\" sizes=\"auto, (max-width: 575px) 100vw, 575px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">5 &#8211; Le programme des modules de chronom\u00e9trage<\/h3>\n\n\n\n<p>Le programme utilise un plugin <strong>Makecode <\/strong>pour le capteur <strong>RFID rc522<\/strong> :<br><a href=\"https:\/\/github.com\/du-man-net\/rfid_rc522\">https:\/\/github.com\/du-man-net\/rfid_rc522<\/a><\/p>\n\n\n\n<p>Le programme pour <strong>Makecode<\/strong><\/p>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-d3e0e592-5576-4bbd-a907-d74c8c721b8e\" href=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/microbit-rc522.hex\">microbit-rc522<\/a><a href=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/microbit-rc522.hex\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-d3e0e592-5576-4bbd-a907-d74c8c721b8e\">T\u00e9l\u00e9charger<\/a><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"623\" src=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/image-42-1024x623.png\" alt=\"\" class=\"wp-image-1237\" srcset=\"https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/image-42-1024x623.png 1024w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/image-42-300x183.png 300w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/image-42-768x467.png 768w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/image-42-1536x935.png 1536w, https:\/\/www.du-man.net\/wordpress\/wp-content\/uploads\/2025\/05\/image-42.png 1857w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Projet lanc\u00e9 avec les classes de 4\u1d49 : comment automatiser le chronom\u00e9trage d&rsquo;une course d&rsquo;endurance. 1 &#8211; La technique La solution retenue a \u00e9t\u00e9 d&rsquo;utiliser &hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-1159","post","type-post","status-publish","format-standard","hentry","category-rasppberrypi"],"_links":{"self":[{"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/posts\/1159","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/comments?post=1159"}],"version-history":[{"count":13,"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/posts\/1159\/revisions"}],"predecessor-version":[{"id":1249,"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/posts\/1159\/revisions\/1249"}],"wp:attachment":[{"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/media?parent=1159"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/categories?post=1159"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.du-man.net\/wordpress\/wp-json\/wp\/v2\/tags?post=1159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}