{"id":1745,"date":"2019-06-20T17:04:44","date_gmt":"2019-06-20T15:04:44","guid":{"rendered":"http:\/\/entropie.org\/3615\/?p=1745"},"modified":"2021-03-02T02:17:29","modified_gmt":"2021-03-02T01:17:29","slug":"mise-a-jour-de-la-centrale-alpha-3","status":"publish","type":"post","link":"https:\/\/entropie.org\/3615\/index.php\/2019\/06\/20\/mise-a-jour-de-la-centrale-alpha-3\/","title":{"rendered":"Mise \u00e0 jour de la centrale Alpha 3"},"content":{"rendered":"\r\n<ul class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"680\" src=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4736-1680x1116-1024x680.jpg\" alt=\"\" data-id=\"1753\" data-link=\"https:\/\/entropie.org\/3615\/dsc_4736-1680x1116\/\" class=\"wp-image-1753\" srcset=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4736-1680x1116-1024x680.jpg 1024w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4736-1680x1116-300x199.jpg 300w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4736-1680x1116-768x510.jpg 768w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4736-1680x1116-1200x797.jpg 1200w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4736-1680x1116.jpg 1680w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><figcaption>Alpha 1<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"680\" src=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4721-1680x1116-1024x680.jpg\" alt=\"\" data-id=\"1752\" data-link=\"https:\/\/entropie.org\/3615\/dsc_4721-1680x1116\/\" class=\"wp-image-1752\" srcset=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4721-1680x1116-1024x680.jpg 1024w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4721-1680x1116-300x199.jpg 300w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4721-1680x1116-768x510.jpg 768w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4721-1680x1116-1200x797.jpg 1200w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4721-1680x1116.jpg 1680w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><figcaption>Alpha 1<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"680\" src=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4847-1680x1116-1024x680.jpg\" alt=\"\" data-id=\"1754\" data-link=\"https:\/\/entropie.org\/3615\/dsc_4847-1680x1116\/\" class=\"wp-image-1754\" srcset=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4847-1680x1116-1024x680.jpg 1024w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4847-1680x1116-300x199.jpg 300w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4847-1680x1116-768x510.jpg 768w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4847-1680x1116-1200x797.jpg 1200w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4847-1680x1116.jpg 1680w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><figcaption>Alpha 2<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"680\" src=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4852-1680x1116-1024x680.jpg\" alt=\"\" data-id=\"1755\" data-link=\"https:\/\/entropie.org\/3615\/dsc_4852-1680x1116\/\" class=\"wp-image-1755\" srcset=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4852-1680x1116-1024x680.jpg 1024w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4852-1680x1116-300x199.jpg 300w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4852-1680x1116-768x510.jpg 768w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4852-1680x1116-1200x797.jpg 1200w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_4852-1680x1116.jpg 1680w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><figcaption>Alpha 2<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"680\" src=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8851-1680x1116-1024x680.jpg\" alt=\"\" data-id=\"1757\" data-link=\"https:\/\/entropie.org\/3615\/dsc_8851-1680x1116\/\" class=\"wp-image-1757\" srcset=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8851-1680x1116-1024x680.jpg 1024w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8851-1680x1116-300x199.jpg 300w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8851-1680x1116-768x510.jpg 768w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8851-1680x1116-1200x797.jpg 1200w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8851-1680x1116.jpg 1680w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><figcaption>Alpha 3<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"680\" src=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8862-1680x1116-1024x680.jpg\" alt=\"\" data-id=\"1756\" data-link=\"https:\/\/entropie.org\/3615\/dsc_8862-1680x1116\/\" class=\"wp-image-1756\" srcset=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8862-1680x1116-1024x680.jpg 1024w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8862-1680x1116-300x199.jpg 300w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8862-1680x1116-768x510.jpg 768w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8862-1680x1116-1200x797.jpg 1200w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/DSC_8862-1680x1116.jpg 1680w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><figcaption>Alpha 3<\/figcaption><\/figure><\/li><\/ul>\r\n\r\n<p>Je viens de mettre \u00e0 jour la centrale Alpha 3. Elle est le 3\u00e8me prototype d&rsquo;une centrale d&rsquo;acquisition LIBRE \u00e0 destination des enseignants de physique-chimie. Elle est actuellement con\u00e7ue autour d&rsquo;une carte Arduino Mega 2560 (par cons\u00e9quent, enti\u00e8rement reprogrammable par le port USB). Les p\u00e9riodes d&rsquo;\u00e9chantillonnages sont adapt\u00e9es \u00e0 des ph\u00e9nom\u00e8mes relativement lents : elles varient du dixi\u00e8me de seconde \u00e0 l&rsquo;heure. Un mode manuel (acquisition pas \u00e0 pas) est \u00e9galement disponible. Les donn\u00e9es (horodat\u00e9es) sont enregistr\u00e9es au format texte sur une carte SD. Elles se r\u00e9cup\u00e8rent par l&rsquo;interm\u00e9diaire d&rsquo;un c\u00e2ble USB connect\u00e9 \u00e0 un ordinateur sous Linux, Windows ou Mac OS X. Les donn\u00e9es brutes sont ensuite facilement exploitables dans un tableur ou avec Python (format CSV). La centrale fonctionne sur batterie ou sur secteur. Elle peut \u00eatre \u00e9galement aliment\u00e9e par le port USB. Elle int\u00e8gre un certain nombre de capteurs dont une boussole qui mesure l&rsquo;azimut, le roulis et le tangage ; un baro-altim\u00e8tre qui mesure la pression absolue, la pression relative et l&rsquo;altitude ; enfin un acc\u00e9l\u00e9rom\u00e8tre qui mesure les acc\u00e9l\u00e9rations suivant 2 axes actuellement. Les mesures renvoy\u00e9es par la boussole font l&rsquo;objet d&rsquo;un traitement informatique en temps r\u00e9el afin de compenser certaines erreurs de mesures li\u00e9es \u00e0 des perturbations \u00e9lectromagn\u00e9tiques \u00e0 l&rsquo;int\u00e9rieur du bo\u00eetier.<\/p>\r\n<p><\/p>\r\n<div style=\"width: 840px;\" class=\"wp-video\"><!--[if lt IE 9]><script>document.createElement('video');<\/script><![endif]-->\n<video class=\"wp-video-shortcode\" id=\"video-1745-1\" width=\"840\" height=\"472\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/Centrale_Alpha_3.mp4?_=1\" \/><a href=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/Centrale_Alpha_3.mp4\">https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/05\/Centrale_Alpha_3.mp4<\/a><\/video><\/div>\r\n<p>Code source sur <a href=\"https:\/\/github.com\/eserandour\/Centrale_Alpha_3\" target=\"_blank\" rel=\"noopener noreferrer\">GitHub<\/a><\/p>\r\n\r\n<p>Le <a href=\"https:\/\/github.com\/eserandour\/Centrale_Alpha_3\/blob\/master\/Alpha_3_Recuperation.py\" rel=\"noopener noreferrer\" target=\"_blank\">logiciel<\/a> de r\u00e9cup\u00e9ration et traitement des donn\u00e9es est d\u00e9sormais d\u00e9velopp\u00e9 en Python. Il permet d&rsquo;effectuer plusieurs types de r\u00e9gression (lin\u00e9aire, quadratique, cubique, quartique, exponentielle, logarithmique, puissance, trigonom\u00e9trique) :<\/p>\r\n\r\n<a href=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/06\/arduino-python.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/06\/arduino-python-1024x637.png\" alt=\"\" width=\"840\" height=\"523\" class=\"alignnone size-large wp-image-1986\" srcset=\"https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/06\/arduino-python-1024x637.png 1024w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/06\/arduino-python-300x187.png 300w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/06\/arduino-python-768x478.png 768w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/06\/arduino-python-1200x747.png 1200w, https:\/\/entropie.org\/3615\/wp-content\/uploads\/2019\/06\/arduino-python.png 1287w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/a>","protected":false},"excerpt":{"rendered":"<p>Je viens de mettre \u00e0 jour la centrale Alpha 3. Elle est le 3\u00e8me prototype d&rsquo;une centrale d&rsquo;acquisition LIBRE \u00e0 destination des enseignants de physique-chimie. Elle est actuellement con\u00e7ue autour d&rsquo;une carte Arduino Mega 2560 (par cons\u00e9quent, enti\u00e8rement reprogrammable par le port USB). Les p\u00e9riodes d&rsquo;\u00e9chantillonnages sont adapt\u00e9es \u00e0 des ph\u00e9nom\u00e8mes relativement lents : elles &hellip; <a href=\"https:\/\/entropie.org\/3615\/index.php\/2019\/06\/20\/mise-a-jour-de-la-centrale-alpha-3\/\" class=\"more-link\">Continuer la lecture<span class=\"screen-reader-text\"> de &laquo;&nbsp;Mise \u00e0 jour de la centrale Alpha 3&nbsp;&raquo;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,21],"tags":[],"class_list":["post-1745","post","type-post","status-publish","format-standard","hentry","category-arduino","category-python"],"_links":{"self":[{"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/posts\/1745"}],"collection":[{"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/comments?post=1745"}],"version-history":[{"count":45,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/posts\/1745\/revisions"}],"predecessor-version":[{"id":3767,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/posts\/1745\/revisions\/3767"}],"wp:attachment":[{"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/media?parent=1745"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/categories?post=1745"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/tags?post=1745"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}