\nLa baisse de la tension permet de r\u00e9duire la dissipation thermique et la consommation en \u00e9nergie.
\nLe passage du 5v \u00e0 3.3v<\/span><\/strong><\/span> a \u00e9t\u00e9 permis par l\u2019av\u00e8nement des transistors CMOS<\/strong>, et donc des circuits logiques moins gourmands que les anciens TTL<\/strong>.<\/p>\n
Les \u00a0circuits TTL<\/strong> doivent \u00eatre\u00a0aliment\u00e9s par\u00a0un voltage de<\/strong> 5 volts<\/strong> en courant continu et rien d’autre.Les circuits CMOS<\/strong> sont plus souples puisqu’on peut les alimenter avec un voltage de 3 \u00e0 18 volts<\/strong> en courant continu.<\/p>\n On trouve maintenant des tensions plus basse dans les circuits logiques comme du 1,8v dans les ordinateurs portables mais on va se limiter \u00e0 l’\u00e9lectronique pour makers, 5v ou 3.3v.<\/p>\n Les ports GPIO<\/span><\/strong><\/p>\n Les ports GPIO<\/b> (General Purpose Input\/Output<\/b>, litt\u00e9ralement Entr\u00e9e\/Sortie pour un Usage G\u00e9n\u00e9ral<\/i>) sont des ports d’entr\u00e9e\/sortie tr\u00e8s utilis\u00e9s dans le monde des microcontr\u00f4leurs, en particulier dans le domaine de l’\u00e9lectronique embarqu\u00e9e, qui ont fait leur apparition aux d\u00e9buts des ann\u00e9es 1980.<\/p>\n Les GPIO des cartes \u00e0 microcontroleurs arduino<\/strong> ont leur niveau logique haut (1) \u00e0 5v<\/strong> La carte smoothieboard qui comme le Raspberry poss\u00e8de un processeur type ARM poss\u00e8de des entr\u00e9es pour les endstop dont le niveau logique haut est 5v mais pour les autres GPIO et le pilotage des drivers externes c’est 3,3v<\/p>\n <\/p>\n <\/p>\n Les drivers externes ont g\u00e9n\u00e9ralement besoin de 5v comme niveau logique haut<\/strong><\/span><\/p>\n <\/p>\n Les SSR<\/strong> ( s<\/strong>olid s<\/strong>tate r<\/strong>elay ) acceptent comme \u00e9tat logique d’entr\u00e9e un voltage allant de 3<\/strong> \u00e0 32<\/strong> VDC.<\/span><\/p>\n [\/et_pb_text][et_pb_comments admin_label=\u00a0\u00bbCommentaires\u00a0\u00bb show_avatar=\u00a0\u00bbon\u00a0\u00bb show_reply=\u00a0\u00bbon\u00a0\u00bb show_count=\u00a0\u00bboff\u00a0\u00bb background_layout=\u00a0\u00bblight\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb custom_button=\u00a0\u00bboff\u00a0\u00bb button_letter_spacing=\u00a0\u00bb0″ button_use_icon=\u00a0\u00bbdefault\u00a0\u00bb button_icon_placement=\u00a0\u00bbright\u00a0\u00bb button_on_hover=\u00a0\u00bbon\u00a0\u00bb button_letter_spacing_hover=\u00a0\u00bb0″] [\/et_pb_comments][\/et_pb_column][\/et_pb_row][\/et_pb_section][:]<\/p>\n","protected":false},"excerpt":{"rendered":" [:en][et_pb_section admin_label=\u00a0\u00bbsection\u00a0\u00bb][et_pb_row admin_label=\u00a0\u00bbrow\u00a0\u00bb][\/et_pb_row][\/et_pb_section][:fr][et_pb_section admin_label=\u00a0\u00bbsection\u00a0\u00bb][et_pb_row admin_label=\u00a0\u00bbrow\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″][et_pb_post_title admin_label=\u00a0\u00bbTitre du poste\u00a0\u00bb title=\u00a0\u00bbon\u00a0\u00bb meta=\u00a0\u00bbon\u00a0\u00bb author=\u00a0\u00bbon\u00a0\u00bb date=\u00a0\u00bbon\u00a0\u00bb categories=\u00a0\u00bbon\u00a0\u00bb comments=\u00a0\u00bboff\u00a0\u00bb featured_image=\u00a0\u00bboff\u00a0\u00bb featured_placement=\u00a0\u00bbbelow\u00a0\u00bb parallax_effect=\u00a0\u00bbon\u00a0\u00bb parallax_method=\u00a0\u00bbon\u00a0\u00bb text_orientation=\u00a0\u00bbleft\u00a0\u00bb text_color=\u00a0\u00bbdark\u00a0\u00bb text_background=\u00a0\u00bboff\u00a0\u00bb text_bg_color=\u00a0\u00bbrgba(255,255,255,0.9)\u00a0\u00bb module_bg_color=\u00a0\u00bbrgba(255,255,255,0)\u00a0\u00bb title_all_caps=\u00a0\u00bboff\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb] [\/et_pb_post_title][et_pb_text admin_label=\u00a0\u00bbTexte\u00a0\u00bb] De plus en plus d\u2019\u00e9quipements \u00e9lectroniques fonctionnent en 3,3v alors qu\u2019avant c\u2019\u00e9tait 5v. La baisse de la tension permet de r\u00e9duire la dissipation thermique et […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[84],"tags":[],"class_list":["post-28265","post","type-post","status-publish","format-standard","hentry","category-electronique-numerique-autres-sujets"],"_links":{"self":[{"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/posts\/28265","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/comments?post=28265"}],"version-history":[{"count":1,"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/posts\/28265\/revisions"}],"predecessor-version":[{"id":33077,"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/posts\/28265\/revisions\/33077"}],"wp:attachment":[{"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/media?parent=28265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/categories?post=28265"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.makerslide-machines.xyz\/old\/wp-json\/wp\/v2\/tags?post=28265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nalors que les GPIO des mini ordinateurs Raspbery<\/strong> ont leurs niveau logique heur \u00e0 3.3V<\/strong><\/p>\n![\"gpio-smoothie-1\"](\"http:\/\/www.makerslide-machines.com\/wp-content\/uploads\/2017\/01\/gpio-smoothie-1.jpg\")
<\/p>\n![\"gpio-smoothie-2\"](\"http:\/\/www.makerslide-machines.com\/wp-content\/uploads\/2017\/01\/gpio-smoothie-2.jpg\")
<\/p>\n![\"driver-wantai\"](\"http:\/\/www.makerslide-machines.com\/wp-content\/uploads\/2017\/01\/driver-wantai.jpg\")
<\/p>\n![\"ssr\"](\"http:\/\/www.makerslide-machines.com\/wp-content\/uploads\/2017\/01\/ssr.jpg\")
<\/p>\n