{"id":359,"date":"2014-02-20T03:03:02","date_gmt":"2014-02-20T02:03:02","guid":{"rendered":"https:\/\/www.fanjoe.be\/?p=359"},"modified":"2014-03-29T22:17:26","modified_gmt":"2014-03-29T21:17:26","slug":"359","status":"publish","type":"post","link":"https:\/\/www.fanjoe.be\/?p=359","title":{"rendered":"Sonde DS18B20"},"content":{"rendered":"

Apr\u00e8s quelques jours d’essais concluants d’activations\/d\u00e9sactivations de la chaudi\u00e8re par internet, je me suis mis en qu\u00eate d’une sonde thermique pour lire, \u00e0 distance, la temp\u00e9rature ambiante de mon appartement.<\/p>\n

J’ai trouv\u00e9, sur eBay, pour une somme d\u00e9risoire (1,56\u20ac), une sonde thermique DS18B20.<\/p>\n

\"sonde-DS18B20-01\"<\/a><\/p>\n

C’est une sonde avec un data unifilaire (GND, VCC et DATA) sur laquelle il faudra souder une r\u00e9sistance de 4,7k\u03a9 entre VCC et DATA.
\nLe sh\u00e9ma du raccordement au RPi est issu de ce site<\/a>.<\/p>\n

\"Sonde <\/a>
Sonde DS18B20 <\/div> <\/div> <\/div>
\"Sh\u00e9ma <\/a>
Sh\u00e9ma des bornes de la sonde o\u00f9 souder la r\u00e9sistance <\/div> <\/div> <\/div> <\/div>
\"Raccordement <\/a>
Raccordement sur le RPi <\/div> <\/div> <\/div> <\/div> <\/div>\n

Ce site<\/a> toujours, explique \u00e9galement comment activer les modules kernel GPIO et Therm et comment trouver l’ID de la sonde.<\/p>\n

Gr\u00e2ce \u00e0 cette sonde, et par l’interm\u00e9diaire d’un petit script chop\u00e9 ici<\/a>, je pourrai afficher la temp\u00e9rature ambiante.<\/p>\n

[php]<?php
\n\/\/File to read
\n$file = ‘\/sys\/devices\/w1_bus_master1\/10-000802292522\/w1_slave’;<\/p>\n

\/\/Read the file line by line
\n$lines = file($file);<\/p>\n

\/\/Get the temp from second line
\n$temp = explode(‘=’, $lines[1]);<\/p>\n

\/\/Setup some nice formatting (i.e. 21,3)
\n$temp = number_format($temp[1] \/ 1000, 1, ‘,’, \u00a0\u00bb);<\/p>\n

\/\/And echo that temp
\necho $temp . " \u00b0C";
\n?>[\/php]<\/p>\n

Et une fois tout \u00e7a mis en page, voici ce que \u00e7a donne :<\/p>\n

\"sonde-DS18B20-04\"<\/a><\/p>\n

La pr\u00e9sentation sous forme de bulles est r\u00e9alis\u00e9e en CSS. La source est ici<\/a>.<\/p>\n

A gauche la temp\u00e9rature du CPU du RPi et \u00e0 droite celle de l’appartement qui est fictive actuellement.<\/p>\n","protected":false},"excerpt":{"rendered":"

Apr\u00e8s quelques jours d’essais concluants d’activations\/d\u00e9sactivations de la chaudi\u00e8re par internet, je me suis mis en qu\u00eate d’une…<\/p>\n","protected":false},"author":1,"featured_media":366,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[179,10,3,12],"tags":[19,20,18],"class_list":["post-359","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-domotique","category-geek","category-informatique","category-raspberrypi","tag-app","tag-interface","tag-sonde-ds18b20","end"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.fanjoe.be\/wp-content\/uploads\/2014\/02\/sonde-DS18B20.png","_links":{"self":[{"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=\/wp\/v2\/posts\/359","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=359"}],"version-history":[{"count":0,"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=\/wp\/v2\/posts\/359\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=\/wp\/v2\/media\/366"}],"wp:attachment":[{"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=359"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=359"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fanjoe.be\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=359"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}