{"id":223,"date":"2018-11-07T17:43:10","date_gmt":"2018-11-07T16:43:10","guid":{"rendered":"http:\/\/www.boichat.ch\/wpjrsp\/?p=223"},"modified":"2019-05-18T14:40:43","modified_gmt":"2019-05-18T12:40:43","slug":"raspberry-pi-zero-wh","status":"publish","type":"post","link":"https:\/\/www.boichat.ch\/wpjrsp\/2018\/11\/07\/raspberry-pi-zero-wh\/","title":{"rendered":"Raspberry Pi Zero WH"},"content":{"rendered":"

Le Raspberry Pi Zero WH est un petit Raspberry Pi \u00e0 environ 25 Euros.<\/p>\n

\"\"<\/p>\n

Nous en trouverons une tr\u00e8s br\u00e8ve introduction ici<\/a>.<\/p>\n

Question: Peut-on l’utiliser dans le cadre de ce livre?<\/strong><\/span>
\nEt la r\u00e9ponse: oui!<\/strong><\/span><\/p>\n

Description de l’installation avec les r\u00e9f\u00e9rences aux chapitres du livre.<\/h3>\n

J’ai tout d’abord acheter une micro carte SD, cette fois-ci un autre mod\u00e8le, une Samsung Evo+ microSD UHS-I (32Go, Classe 10). Comme j’avais d\u00e9j\u00e0 plusieurs alimentations pour mes Raspberry Pi, je n’ai pas fait ce nouvel achat. Cette alimentation se connecte sur le port mini USB marqu\u00e9 PWD IN.<\/p>\n

Sur le site Raspbian France<\/a>, en voyant la version\u00a0Raspbian Stretch Lite, j’ai pens\u00e9 qu’elle serait plus profitable. Mais j’ai d\u00fb d\u00e9chanter et recommencer avec la version d\u00e9crite dans le livre. Dans la version Lit, j’avais du installer s\u00e9par\u00e9ment Java et les librairies du Pi4J. <\/strong>Cette derni\u00e8re\u00a0refusait de fonctionner avec l’exemple Java pr\u00e9sent\u00e9s ci-dessous. La partie Python fonctionnait.<\/p>\n

J’ai donc install\u00e9 le\u00a0Raspberry Pi Zero WH<\/strong> de la m\u00eame mani\u00e8re que d\u00e9crit au chapitre 3 pour la version sans \u00e9cran. L’image que j’ai utilis\u00e9e, 2018-10-09-raspbian-stretch.img<\/span><\/strong>, avec les proc\u00e9dures d\u00e9crites des fichiers SSH <\/span><\/strong>et\u00a0wpa_supplicant.conf<\/span><\/strong> m’ont permis rapidement de me connecter avec PuTTY\u00a0<\/strong>(chapitre 4) et de fixer l’adresse IP dans le\u00a0 routeur. Toutes ces choses sont d\u00e9crites dans ce m\u00eame chapitre 3 (une v\u00e9rification suppl\u00e9mentaire pour moi apr\u00e8s la derni\u00e8re relecture par mon \u00e9diteur).<\/p>\n

Il m’a fallu \u00e9videmment install\u00e9 le logiciel Pi4J<\/strong><\/a> (chapitre 7) et j’ai omis volontairement la partie de la compilation des exemples du Pi4J<\/strong>.<\/p>\n

Pour v\u00e9rifier Python et Java, j’ai utilis\u00e9 le script relay.py et la classe Relay du chapitre 15.\u00a0<\/strong><\/p>\n

Avec PuTTY<\/strong>, j’ai cr\u00e9\u00e9 deux r\u00e9pertoires python <\/span>et java<\/span>, et avec WinScp<\/strong> (chapitre 4) copi\u00e9 les 2 fichiers. Le fichier Relay.class<\/span> venait du workspace d’Eclipse<\/strong> (chapitre 1 et 2) o\u00f9 la classe Relay.java<\/span> a \u00e9t\u00e9 d\u00e9velopp\u00e9e et test\u00e9e en mode simulation (chapitre 15). Le PC n’a pas d’interface GPIO<\/a>.<\/p>\n

pi@raspberrypi:~ $ cd python<\/span><\/strong><\/span>
\npi@raspberrypi:~\/python $ python relay.py<\/span><\/strong><\/span><\/p>\n

Les clics du relais indiquent que le script fonctionne bien.<\/p>\n

Le fichier Relay.sh<\/span> a \u00e9t\u00e9 pr\u00e9par\u00e9 sous PuTTY<\/strong> avec l’\u00e9diteur vi<\/strong>\u00a0de Linux (chapitre 4 ou nano<\/strong> est aussi possible) avec :
\npi@raspberrypi:~\/java $ cat Relay.sh<\/span>
\njava -Dpi4j.linking=dynamic -classpath .:\/opt\/pi4j\/lib\/’*’ Relay<\/span><\/p>\n

Enfin le r\u00e9sultat en Java, avec des clics du relais et des infos \u00e0 l’\u00e9cran comme d\u00e9crit dans le chapitre 15:<\/p>\n

pi@raspberrypi:~\/python $ cd ..\/java<\/span>
\npi@raspberrypi:~\/java $ ls<\/span>
\nRelay.class<\/span>
\npi@raspberrypi:~\/java $ vi Relay.sh<\/span>
\npi@raspberrypi:~\/java $ chmod +x Relay.sh<\/span>
\npi@raspberrypi:~\/java $ .\/Relay.sh<\/span>
\n****** Relay activated: true<\/span>
\n****** Relay activated: false<\/span>
\nTest of periodicity<\/span>
\nStart of ON period<\/span>
\n****** Relay activated: true<\/span>
\nAlready in ON period: 3<\/span>
\nAlready in ON period: 1<\/span>
\nStart of OFF period ******************<\/span><\/p>\n

Les exemples Python et Java du relais utilisent la broche physique 16\u00a0 de l’interface GPIO<\/a>\u00a0et la\u00a0 broche GPIO_04 du Pi4J<\/a>\u00a0(en Annexe dans le livre).<\/p>\n

Si nous voulions modifier la broche du relais (voir la figure Fritzing<\/strong><\/a> du chapitre 15 pour la connection du\u00a0 5V et du Gnd), il faudrait modifier
\nRelayPin = 16 # broche 16 (GPIO 4)<\/span><\/strong><\/span>
\ndans le code de relay.py<\/span>
\net
\nRelay ourRelay1 = new Relay(isTarget, RaspiPin.GPIO_04, true);<\/span><\/strong><\/span>
\ndans la classe\u00a0Relay.java<\/span> dans Eclipse et le projet\u00a0RelaisEclairage<\/span><\/strong> (chapitre 15).<\/p>\n","protected":false},"excerpt":{"rendered":"

Le Raspberry Pi Zero WH est un petit Raspberry Pi \u00e0 environ 25 Euros. Nous en trouverons une tr\u00e8s br\u00e8ve introduction ici. Question: Peut-on l’utiliser…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"yoast_head":"\nRaspberry Pi Zero WH - Un livre sur Java, Python, Eclipse et le Raspberry Pi 3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.boichat.ch\/wpjrsp\/2018\/11\/07\/raspberry-pi-zero-wh\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Raspberry Pi Zero WH - Un livre sur Java, Python, Eclipse et le Raspberry Pi 3\" \/>\n<meta property=\"og:description\" content=\"Le Raspberry Pi Zero WH est un petit Raspberry Pi \u00e0 environ 25 Euros. 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