{"id":535,"date":"2014-11-25T18:15:18","date_gmt":"2014-11-25T17:15:18","guid":{"rendered":"http:\/\/www.xpablo.cz\/?p=535"},"modified":"2014-12-24T10:22:25","modified_gmt":"2014-12-24T09:22:25","slug":"esp8266-nejlevnejsi-pocitac-na-svete-se-sitovym-pripojenim-a-moznosti-programovani-ve-vyssim-jazyce","status":"publish","type":"post","link":"https:\/\/www.xpablo.cz\/?p=535","title":{"rendered":"ESP8266 – Nejlevn\u011bj\u0161\u00ed po\u010d\u00edta\u010d na sv\u011bt\u011b se s\u00ed\u0165ov\u00fdm p\u0159ipojen\u00edm a mo\u017enost\u00ed programov\u00e1n\u00ed ve vy\u0161\u0161\u00edm jazyce"},"content":{"rendered":"

\"IMG_8796_web\"<\/a>Jsou to u\u017e t\u00e9m\u011b\u0159 dva m\u011bs\u00edce, kdy\u017e jsem napsal \u010dl\u00e1nek o nejlevn\u011bj\u0161\u00edm \u010d\u00ednsk\u00e9m WiFi modulu na trhu, kter\u00fd jsem si objednal. Moduly dorazily v po\u0159\u00e1dku, ale j\u00e1 n\u011bjak nem\u011bl \u010das si s nimi pohr\u00e1t – pot\u00ed\u017e byla v tom, \u017ee i\/o nap\u011bt\u00ed pro ESP8266 je max. 3.3V a v\u0161echna Arduina, kter\u00e1 doma m\u00e1m jsou (zat\u00edm) pouze pro 5V. Objednal jsem tedy nap\u011b\u0165ov\u00e9 redukce a Arduino s 3.3V logikou, jenom\u017ee to je\u0161t\u011b nedorazilo. Na\u0161t\u011bst\u00ed jsem v pr\u00e1ci designoval desku, do kter\u00e9 byl zakomponovan\u00fd konektor pro pou\u017eit\u00ed modulu ESP-01. O v\u00edkendu jsem tedy nelenil a napsal emul\u00e1tor NVT protokolu a vytvo\u0159il jednoduch\u00fd projekt, kter\u00fd simuluje s\u00e9riov\u00fd port p\u0159es TCP\/IP protokol. Na stran\u011b PC jsem nainstaloval virtu\u00e1ln\u00ed s\u00e9riov\u00fd port<\/a> a pak u\u017e bylo mo\u017en\u00e9 pomoc\u00ed termin\u00e1lu otestovat spojen\u00ed.<\/p>\n

\"ESP_Reset\"<\/a><\/p>\n

Programov\u00e1 podpora, stejn\u011b jako dostupn\u00e1 dokumentace se na internetu slibn\u011b rozj\u00ed\u017ed\u00ed a v\u010dera ve\u010der jsem objevil p\u0159\u00edmo neuv\u011b\u0159itelnou v\u011bc – existuje alternativn\u00ed FW, kter\u00fd obsahuje interpreter jazyka LUA<\/a> (u\u010debnici LUA<\/a> m\u00e1m ve sv\u00e9m Kindlu tu\u0161\u00edm od za\u010d\u00e1tku roku…). Pro \u00fa\u010dely p\u0159ehr\u00e1v\u00e1n\u00ed firmware jsem modul doplnil mikrotla\u010d\u00edtkem, kter\u00e9 p\u0159i zapnut\u00ed nap\u00e1jen\u00ed uv\u00e1d\u00ed syst\u00e9m do re\u017eimu aktualizace – zjistil jsem toti\u017e, \u017ee nen\u00ed nutn\u00e9 m\u00edt piny spojen\u00e9 trvale, ale sta\u010d\u00ed jen chv\u00edli p\u0159i startu modulu.<\/p>\n

\"ELUA_1_web\"<\/a><\/p>\n

M\u016fj virtu\u00e1ln\u00ed s\u00e9riov\u00fd port si s aktualizac\u00ed FW poradil, pouze p\u0159i ukon\u010dov\u00e1n\u00ed vyp\u00ed\u0161e, \u017ee se mu nepoda\u0159ilo opustit programovac\u00ed re\u017eim.<\/p>\n

\"ELUA_Downloader\"<\/a><\/p>\n

Na tom budu muset je\u0161t\u011b zapracovat, nicm\u00e9n\u011b firmware je nahran\u00fd a funk\u010dn\u00ed.<\/p>\n

Po restartu s nov\u00fdm FW se ji\u017e spustil interpreter LUA.<\/p>\n

\"ELUA_term_boot\"<\/a><\/p>\n

Zaj\u00edmalo m\u011b, kolik pam\u011bti RAM zb\u00fdv\u00e1 pro skripty a prom\u011bnn\u00e9 – na\u0161t\u011bst\u00ed je implementov\u00e1n v\u00fdpis velikosti hromady – a zde je v\u00fdsledek:<\/p>\n

\"ELUA_Heap\"<\/a><\/p>\n

Implementov\u00e1n je rovn\u011b\u017e mal\u00fd souborov\u00fd syst\u00e9m, startovac\u00ed skript, \u010dasov\u00e1n\u00ed, deepsleep re\u017eim… V podstat\u011b se d\u00e1 \u0159\u00edct, \u017ee pro realizaci jednoduch\u00e9ho senzoru, nebo aktu\u00e1toru u\u017e nen\u00ed t\u0159eba nic jin\u00e9ho. Sta\u010d\u00ed pouze tento modul a p\u0159izp\u016fsoben\u00ed (tranzistor, dioda, odpory).<\/p>\n

Podle m\u00e9ho n\u00e1zoru je toto skute\u010dn\u00e1 revoluce pro IoT sf\u00e9ru – bude u\u017e jen z\u00e1le\u017eet na odb\u011bru proudu pro realizaci bateriov\u00fdch za\u0159\u00edzen\u00ed. Odb\u011br jsem zm\u011b\u0159it cht\u011bl, ale m\u016fj letit\u00fd laboratorn\u00ed zdroj zlob\u00ed \u010d\u00edm d\u00e1l t\u00edm v\u00edc a j\u00e1 nem\u011bl odvahu p\u0159ipojit modul p\u0159\u00edmo pro m\u011b\u0159en\u00ed odb\u011bru. \u010cek\u00e1m ale na nov\u00fd zdroj, tak\u017ee jakmile doraz\u00ed, tak m\u011b\u0159en\u00ed ur\u010dit\u011b prob\u011bhne…<\/p>\n","protected":false},"excerpt":{"rendered":"

Jsou to u\u017e t\u00e9m\u011b\u0159 dva m\u011bs\u00edce, kdy\u017e jsem napsal \u010dl\u00e1nek o nejlevn\u011bj\u0161\u00edm \u010d\u00ednsk\u00e9m WiFi modulu na trhu, kter\u00fd jsem si objednal. Moduly dorazily v po\u0159\u00e1dku, ale j\u00e1 n\u011bjak nem\u011bl \u010das si s nimi pohr\u00e1t – pot\u00ed\u017e byla v tom, \u017ee i\/o nap\u011bt\u00ed pro ESP8266 je max. 3.3V a v\u0161echna Arduina, kter\u00e1 doma m\u00e1m jsou (zat\u00edm) … Pokra\u010dov\u00e1n\u00ed textu ESP8266 – Nejlevn\u011bj\u0161\u00ed po\u010d\u00edta\u010d na sv\u011bt\u011b se s\u00ed\u0165ov\u00fdm p\u0159ipojen\u00edm a mo\u017enost\u00ed programov\u00e1n\u00ed ve vy\u0161\u0161\u00edm jazyce<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[5,25],"tags":[18,20,19],"class_list":["post-535","post","type-post","status-publish","format-standard","hentry","category-elektronika","category-esp8266","tag-esp8266","tag-iot","tag-wifi"],"_links":{"self":[{"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/posts\/535","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=535"}],"version-history":[{"count":4,"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/posts\/535\/revisions"}],"predecessor-version":[{"id":545,"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/posts\/535\/revisions\/545"}],"wp:attachment":[{"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xpablo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}