{"id":6653,"date":"2024-04-21T00:24:33","date_gmt":"2024-04-20T22:24:33","guid":{"rendered":"https:\/\/entropie.org\/3615\/?p=6653"},"modified":"2024-04-25T00:07:18","modified_gmt":"2024-04-24T22:07:18","slug":"trame-dune-telecommande-433-mhz","status":"publish","type":"post","link":"https:\/\/entropie.org\/3615\/index.php\/2024\/04\/21\/trame-dune-telecommande-433-mhz\/","title":{"rendered":"Trame d’une t\u00e9l\u00e9commande 433 MHz"},"content":{"rendered":"

L’objectif est de commander \u00e0 distance des prises de courant t\u00e9l\u00e9command\u00e9es depuis un montage Arduino.<\/p>\n

Arduino + r\u00e9cepteur RTL-SDR + t\u00e9l\u00e9commande 433,92 MHz
\nModulation OOK<\/a> (ASK) ???<\/p>\n

M\u00e9thode\u00a0:<\/p>\n

Dans Universal Radio Hacker<\/a>, apr\u00e8s avoir enregistr\u00e9 le signal de la t\u00e9l\u00e9commande, si Autodetect parameters ne donne rien, on s\u00e9lectionne sur le signal ce qui pourrait correspondre \u00e0 1 bit et on r\u00e8gle Samples\/Symbol sur la valeur obtenue (selected), puis on t\u00e2tonne autour de cette valeur, l\u2019objectif est de r\u00e9cup\u00e9rer une trame qui se r\u00e9p\u00e8te. Si la trame se r\u00e9p\u00e8te entre 860 et 986 Samples\/Symbol, on r\u00e8gle celui-ci sur 923 (la moyenne). On affine Samples\/Symbol en divisant le nombre de samples de la trame par le nombre de bits.<\/p>\n

Puis on calcule la dur\u00e9e des impulsions de chaque bit :
\n137679 selected => 68,84 ms \/ 135 bits = 0,510 ms = 510 microsecondes
\n=> BIT_LEN 510 (dans le programme Arduino<\/a>)<\/p>\n

On calcule enfin la dur\u00e9e entre 2 trames en se basant sur le nombre de samples et Sample rate => SEQ_PAUSE dans le programme Arduino.<\/p>\n

La t\u00e9l\u00e9commande de ma prise envoie le signal qui suit, j’arrive \u00e0 d\u00e9coder la trame mais pas \u00e0 r\u00e9\u00e9mettre ce signal. M\u00eame le HackRF One en mode \u00e9mission a du mal \u00e0 se faire reconna\u00eetre ! \u00c0 approfondir…<\/p>\n

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

\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

L’objectif est de commander \u00e0 distance des prises de courant t\u00e9l\u00e9command\u00e9es depuis un montage Arduino. Arduino + r\u00e9cepteur RTL-SDR + t\u00e9l\u00e9commande 433,92 MHz Modulation OOK (ASK) ??? M\u00e9thode\u00a0: Dans Universal Radio Hacker, apr\u00e8s avoir enregistr\u00e9 le signal de la t\u00e9l\u00e9commande, si Autodetect parameters ne donne rien, on s\u00e9lectionne sur le signal ce qui pourrait correspondre … Continuer la lecture de « Trame d’une t\u00e9l\u00e9commande 433 MHz »<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,50,5],"tags":[],"class_list":["post-6653","post","type-post","status-publish","format-standard","hentry","category-arduino","category-radio","category-tutoriels"],"_links":{"self":[{"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/posts\/6653"}],"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=6653"}],"version-history":[{"count":44,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/posts\/6653\/revisions"}],"predecessor-version":[{"id":6699,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/posts\/6653\/revisions\/6699"}],"wp:attachment":[{"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/media?parent=6653"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/categories?post=6653"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/entropie.org\/3615\/index.php\/wp-json\/wp\/v2\/tags?post=6653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}