{"id":39479,"date":"2019-10-31T22:33:41","date_gmt":"2019-10-31T19:33:41","guid":{"rendered":"https:\/\/prohoster.info\/blog\/5-sposobov-poleznogo-ispolzovaniya-raspberry-pi\/"},"modified":"2019-10-31T22:33:41","modified_gmt":"2019-10-31T19:33:41","slug":"5-sposobov-poleznogo-ispolzovaniya-raspberry-pi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/5-sposobov-poleznogo-ispolzovaniya-raspberry-pi","title":{"rendered":"5 maneiras \u00fateis de usar o Raspberry Pi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ol\u00e1 Habr.<\/p>\n<p>O Raspberry Pi \u00e9 provavelmente comum na casa de quase todos, e arrisco dizer que muitos deles est\u00e3o parados sem uso. Mas o Raspberry n\u00e3o \u00e9 apenas uma valiosa pelagem, \u00e9 tamb\u00e9m um computador fanless bastante poderoso com Linux. Hoje, vamos explorar as utilidades \u00fateis do Raspberry Pi, cuja utiliza\u00e7\u00e3o n\u00e3o exigir\u00e1 a escrita de c\u00f3digo algum. <br \/>\n<img decoding=\"async\" alt=\"5 maneiras \u00fateis de usar o Raspberry Pi\" src=\"\/wp-content\/uploads\/2019\/10\/e69119cc5036df2ca55ee5cea97fe30d.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nPara aqueles que est\u00e3o interessados, detalhes abaixo. Este artigo \u00e9 destinado a iniciantes.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>Nota<\/i>: o artigo \u00e9 destinado a iniciantes, mas que tenham pelo menos no\u00e7\u00f5es b\u00e1sicas sobre o que \u00e9 um endere\u00e7o IP, como acessar o Raspberry Pi via SSH utilizando o putty ou qualquer outro terminal, e como editar arquivos com o editor nano. Como experimento, desta vez n\u00e3o irei 'sobrecarregar' os leitores com c\u00f3digos para Python, pois n\u00e3o haver\u00e1 programa\u00e7\u00e3o envolvida. Para tudo o que vem a seguir, ser\u00e1 suficiente apenas o terminal. Vou observar a aceita\u00e7\u00e3o desse formato com base nas avalia\u00e7\u00f5es do texto.<\/p>\n<p>Certamente, n\u00e3o irei abordar coisas \u00f3bvias como servidor FTP ou compartilhamento de rede. Abaixo, procurei destacar algo mais ou menos \u00fatil e original.<\/p>\n<p>Antes de instalarmos qualquer coisa, \u00e9 importante <b>uma dica<\/b>: uma fonte de alimenta\u00e7\u00e3o adequada (preferencialmente uma original de 2.5A, e n\u00e3o um carregador gen\u00e9rico de celular) e um dissipador para o processador s\u00e3o extremamente importantes para o funcionamento est\u00e1vel do Raspberry Pi. Sem isso, o Raspberry pode travar, podem ocorrer erros na c\u00f3pia de arquivos, entre outros. O problema com esses erros \u00e9 que eles manifestam-se esporadicamente, por exemplo, durante picos de uso da CPU ou ao gravar grandes arquivos no cart\u00e3o SD.<\/p>\n<p>Antes de instalar quaisquer componentes, \u00e9 aconselh\u00e1vel atualizar o sistema, caso contr\u00e1rio, endere\u00e7os antigos para o comando apt podem n\u00e3o funcionar:<\/p>\n<pre><code class=\"bash\">sudo apt-get update<\/code><\/pre>\n<p>\nAgora podemos prosseguir com a instala\u00e7\u00e3o e configura\u00e7\u00e3o.<\/p>\n<h2>1. Ponto de acesso WiFi<\/h2>\n<p>\nO Raspberry Pi pode ser facilmente transformado em um ponto de acesso sem fio, e n\u00e3o \u00e9 necess\u00e1rio comprar nada, o WiFi j\u00e1 vem embutido. Para isso, precisamos instalar 2 componentes: hostapd (Daemon de ponto de acesso, servi\u00e7o do ponto de acesso) e dnsmasq (servidor DNS\/DHCP).<\/p>\n<p>Instalando o dnsmasq e o hostapd:<\/p>\n<pre><code class=\"bash\">sudo apt-get install dnsmasq hostapd<\/code><\/pre>\n<p>\nDefinimos um endere\u00e7o IP est\u00e1tico que o Raspberry Pi ter\u00e1 na rede WiFi. Para isso, precisamos editar o arquivo dhcpcd.conf, digitando o comando <i>sudo nano \/etc\/dhcpcd.conf<\/i>. No arquivo, precisamos adicionar as seguintes linhas:<\/p>\n<pre><code class=\"bash\">interface wlan0\n  static ip_address=198.51.100.100\/24\n  nohook wpa_supplicant\n<\/code><\/pre>\n<p>\nComo podemos ver, na rede WiFi, nossa Raspberry Pi ter\u00e1 o endere\u00e7o 198.51.100.100 (isso \u00e9 importante lembrar, caso algum servidor esteja rodando nela, cujo endere\u00e7o precisa ser inserido no navegador).<\/p>\n<p>Em seguida, precisamos ativar o IP forwarding, para isso, executamos o comando <i>sudo nano \/etc\/sysctl.conf<\/i> e descomentamos a linha <i>net.ipv4.ip_forward=1<\/i>.<\/p>\n<p>Agora precisamos configurar o servidor DHCP \u2014 ele ir\u00e1 atribuir endere\u00e7os IP aos dispositivos conectados. Digite o comando <i>sudo nano \/etc\/dnsmasq.conf<\/i> e adicionamos as seguintes linhas:<\/p>\n<pre><code class=\"bash\">interface=wlan0\ndhcp-range=198.51.100.1,198.51.100.99,255.255.255.0,24h\n<\/code><\/pre>\n<p>\nComo podemos ver, os dispositivos conectados ter\u00e3o endere\u00e7os IP na faixa de 198.51.100.1\u2026 198.51.100.99.<\/p>\n<p>Finalmente, \u00e9 hora de configurar o Wi-Fi. Editamos o arquivo <i>\/etc\/default\/hostapd<\/i> e inserimos a linha <i>DAEMON_CONF=\u00bb\/etc\/hostapd\/hostapd.conf\u00ab<\/i>. Agora vamos editar o arquivo hostapd.conf, digitando o comando <i>sudo nano \/etc\/hostapd\/hostapd.conf<\/i>.<br \/>\nInserimos as configura\u00e7\u00f5es do ponto de acesso:<\/p>\n<pre><code class=\"bash\">interface=wlan0\ndriver=nl80211\nssid=Raspberry Pi\nhw_mode=g\nchannel=7\nwmm_enabled=0\nmacaddr_acl=0\nauth_algs=1\nignore_broadcast_ssid=0\nwpa=2\nwpa_passphrase=12345678\nwpa_key_mgmt=WPA-PSK\nwpa_pairwise=TKIP\nrsn_pairwise=CCMP<\/code><\/pre>\n<p>\n\u00c9 importante prestar aten\u00e7\u00e3o nas configura\u00e7\u00f5es \"ssid\" (nome do ponto de acesso), \"wpa_passphrase\" (senha), \"channel\" (n\u00famero do canal) e \"hw_mode\" (modo de opera\u00e7\u00e3o, a = IEEE 802.11a, 5 GHz, b = IEEE 802.11b, 2.4 GHz, g = IEEE 802.11g, 2.4 GHz). Infelizmente, n\u00e3o h\u00e1 sele\u00e7\u00e3o autom\u00e1tica de canal, ent\u00e3o voc\u00ea ter\u00e1 que escolher manualmente o canal WiFi menos congestionado.<\/p>\n<p><b>Importante<\/b>: neste exemplo de teste a senha \u00e9 12345678, em um ponto de acesso real deve-se usar algo mais complexo. Existem programas que realizam ataques de for\u00e7a bruta com dicion\u00e1rio, e um ponto de acesso com senha simples pode ser invadido. Al\u00e9m disso, compartilhar a internet com estranhos sob as leis atuais pode ser arriscado.<\/p>\n<p>Est\u00e1 tudo pronto, podemos ativar todos os servi\u00e7os. <\/p>\n<pre><code class=\"bash\">sudo systemctl unmask hostapd\nsudo systemctl enable hostapd\nsudo systemctl start hostapd\nsudo systemctl reload dnsmasq<\/code><\/pre>\n<p>\nAgora devemos j\u00e1 ver o novo ponto de acesso WiFi na lista de redes. Mas para que haja internet, \u00e9 necess\u00e1rio ativar o redirecionamento de pacotes de Ethernet para WLAN, para isso digitamos o comando <i>sudo nano \/etc\/rc.local<\/i> e adicionamos a linha de configura\u00e7\u00e3o do iptables:<\/p>\n<pre><code class=\"bash\">sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE\n<\/code><\/pre>\n<p>\nAgora \u00e9 isso. Reinicie a Raspberry Pi, e se tudo foi feito corretamente, poderemos ver o ponto de acesso e nos conectar a ele.<\/p>\n<p><img decoding=\"async\" alt=\"5 maneiras \u00fateis de usar o Raspberry Pi\" src=\"\/wp-content\/uploads\/2019\/10\/fe586866e572ea9950b5ad5f6fcfe9e7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nComo podemos ver, a velocidade n\u00e3o \u00e9 t\u00e3o ruim, e usar esse WiFi \u00e9 bem poss\u00edvel.<\/p>\n<p>A prop\u00f3sito, uma pequena <b>uma dica<\/b>: voc\u00ea pode mudar o nome da rede da Raspberry Pi executando o comando <i>sudo raspi-config<\/i>. Por padr\u00e3o, \u00e9 igual a (surpresa:) raspberrypi. Isso \u00e9 provavelmente um conhecimento geral. No entanto, nem todos sabem que esse nome est\u00e1 dispon\u00edvel tamb\u00e9m na rede local, sendo necess\u00e1rio adicionar \u00ab.local\u00bb. Por exemplo, \u00e9 poss\u00edvel acessar o Raspberry Pi via SSH digitando o comando <i>putty pi@raspberrypi.local<\/i>. Aqui, por\u00e9m, h\u00e1 uma nuance: isso funciona no Windows e no Linux, mas n\u00e3o funciona no Android \u2014 l\u00e1 voc\u00ea ainda precisar\u00e1 inserir o endere\u00e7o IP manualmente.<\/p>\n<h2>2. Servidor de M\u00eddia<\/h2>\n<p>\nExistem 1001 maneiras de fazer um servidor de m\u00eddia no Raspberry Pi, mas eu abordarei apenas a mais simples. Suponha que temos uma cole\u00e7\u00e3o favorita de arquivos MP3 e queremos que ela esteja dispon\u00edvel na rede local para todos os dispositivos de m\u00eddia. Vamos instalar no Raspberry Pi o servidor MiniDLNA, que pode fazer isso por n\u00f3s. <\/p>\n<p>Para instala\u00e7\u00e3o, insira o comando <i>sudo apt-get install minidlna<\/i>. Em seguida, \u00e9 necess\u00e1rio configurar o arquivo, digitando o comando <i>sudo nano \/etc\/minidlna.conf<\/i>. Voc\u00ea precisa adicionar apenas uma linha, indicando o caminho para nossos arquivos: <i>media_dir=\/home\/pi\/MP3<\/i> (o caminho, \u00e9 claro, pode ser diferente). Ap\u00f3s fechar o arquivo, reinicie o servi\u00e7o:<\/p>\n<p><i>sudo systemctl restart minidlna<\/i><\/p>\n<p>Se fizermos tudo corretamente, teremos um servidor de m\u00eddia pronto na rede local, do qual podemos tocar m\u00fasicas atrav\u00e9s de um r\u00e1dio WiFi de mesa ou com o VLC-Player no Android:<\/p>\n<p><img decoding=\"async\" alt=\"5 maneiras \u00fateis de usar o Raspberry Pi\" src=\"\/wp-content\/uploads\/2019\/10\/07991c505022aa823c51bb7176540d90.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<b>Conselho<\/b>: \u00e9 muito f\u00e1cil carregar arquivos no Raspberry Pi usando o WinSCP \u2014 este programa permite trabalhar com as pastas do RPi t\u00e3o facilmente quanto com as locais.<\/p>\n<p><img decoding=\"async\" alt=\"5 maneiras \u00fateis de usar o Raspberry Pi\" src=\"\/wp-content\/uploads\/2019\/10\/7ebb1fd564575179d774ebebb61aecac.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h2>3. Receptor SDR<\/h2>\n<p>\nSe tivermos um receptor RTL-SDR ou SDRPlay, podemos us\u00e1-lo no Raspberry Pi com os programas GQRX ou CubicSDR. Isso permitir\u00e1 ter um receptor SDR aut\u00f4nomo e silencioso, capaz de funcionar at\u00e9 mesmo 24 horas por dia.<\/p>\n<p>Pe\u00e7o desculpas pela qualidade da captura de tela da televis\u00e3o:<\/p>\n<p><img decoding=\"async\" alt=\"5 maneiras \u00fateis de usar o Raspberry Pi\" src=\"\/wp-content\/uploads\/2019\/10\/8f466f8eb64a37c383861b5dd791c81c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCom RTL-SDR ou SDRPlay, \u00e9 poss\u00edvel receber v\u00e1rios sinais de r\u00e1dio com frequ\u00eancia de at\u00e9 1GHz (at\u00e9 um pouco mais). Por exemplo, podemos ouvir n\u00e3o apenas r\u00e1dio FM comum, mas tamb\u00e9m conversas de pilotos ou outros servi\u00e7os. A prop\u00f3sito, os radioamadores podem usar o Raspberry Pi para receber, decodificar e enviar sinais ao servidor <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rtl-sdr.com\/tutorial-setting-up-a-low-cost-qrp-ft8-jt9-wspr-etc-monitoring-station-with-an-rtl-sdr-v3-and-raspberry-pi-3\/\">WSPR e outros modos digitais<\/a><\/noindex>. <\/p>\n<p>Uma an\u00e1lise detalhada do r\u00e1dio SDR vai al\u00e9m do escopo deste artigo; voc\u00ea pode ler mais sobre isso <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450534\/\">aqui<\/a><\/noindex>. <\/p>\n<h2>4. Servidor para \"casa inteligente\"<\/h2>\n<p>\nPara aqueles que desejam tornar sua casa mais \"inteligente\", \u00e9 poss\u00edvel utilizar o software gratuito OpenHAB. <\/p>\n<p><img decoding=\"async\" alt=\"5 maneiras \u00fateis de usar o Raspberry Pi\" src=\"\/wp-content\/uploads\/2019\/10\/78d1b38bb45f4705276cf010b63f6927.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIsso n\u00e3o \u00e9 apenas um programa, mas um verdadeiro framework com v\u00e1rios plugins e scripts, que permite gerenciar diferentes dispositivos (Z-Wave, Philips Hue, etc.). Os interessados podem explorar mais no site oficial. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openhab.org\/\">https:\/\/www.openhab.org<\/a><\/noindex>.<\/p>\n<p>A prop\u00f3sito, j\u00e1 que estamos falando sobre \"casa inteligente\", um servidor MQTT pode perfeitamente funcionar no Raspberry Pi, sendo utilizado por v\u00e1rios dispositivos locais.<\/p>\n<h2>5. Cliente para FlightRadar24<\/h2>\n<p>\nSe voc\u00ea \u00e9 um amante da avia\u00e7\u00e3o e vive em uma regi\u00e3o onde a cobertura do FlightRadar deixa a desejar, pode ajudar a comunidade e todos os viajantes instalando um receptor em sua casa. Para isso, basta ter um receptor RTL-SDR e um Raspberry Pi. Como b\u00f4nus, voc\u00ea ter\u00e1 acesso gratuito a uma conta Pro do FlightRadar24.<\/p>\n<p><img decoding=\"async\" alt=\"5 maneiras \u00fateis de usar o Raspberry Pi\" src=\"\/wp-content\/uploads\/2019\/10\/84d67383fd6b528315789d2ddfc3f413.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nInstru\u00e7\u00f5es detalhadas <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/408003\/\">j\u00e1 foram publicadas<\/a><\/noindex> no Habr.<\/p>\n<h2>Conclus\u00e3o<\/h2>\n<p>\nCertamente, esta lista n\u00e3o \u00e9 de forma alguma exaustiva. O Raspberry Pi possui um bom poder de processamento e pode ser utilizado em uma ampla gama de tarefas, desde consoles de jogos retro ou videovigil\u00e2ncia at\u00e9 reconhecimento de placas de ve\u00edculos ou mesmo como um servi\u00e7o para astronomia. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.instructables.com\/id\/Wireless-All-Sky-Camera\/\">c\u00e2meras all-sky<\/a><\/noindex> para observar meteoros. <\/p>\n<p>Vale lembrar que o que foi escrito se aplica n\u00e3o apenas ao Raspberry Pi, mas tamb\u00e9m a v\u00e1rios \"clones\" (Asus Tinkerboard, Nano Pi, etc.), e todos os programas provavelmente funcionar\u00e3o neles.<\/p>\n<p>Se houver interesse do p\u00fablico (o que ser\u00e1 avaliado pelas classifica\u00e7\u00f5es da mat\u00e9ria), o tema poder\u00e1 ser continuado. <\/p>\n<p>E como sempre, bons experimentos a todos.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/472778\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442 \u0425\u0430\u0431\u0440. Raspberry Pi \u043d\u0430\u0432\u0435\u0440\u043d\u043e\u0435 \u0435\u0441\u0442\u044c \u0434\u043e\u043c\u0430 \u043f\u043e\u0447\u0442\u0438 \u0443 \u043a\u0430\u0436\u0434\u043e\u0433\u043e, \u0438 \u0440\u0438\u0441\u043a\u043d\u0443 \u043f\u0440\u0435\u0434\u043f\u043e\u043b\u043e\u0436\u0438\u0442\u044c, \u0447\u0442\u043e \u0443 \u043c\u043d\u043e\u0433\u0438\u0445 \u043e\u043d\u0430 \u0432\u0430\u043b\u044f\u0435\u0442\u0441\u044f \u0431\u0435\u0437 \u0434\u0435\u043b\u0430. \u0410 \u0432\u0435\u0434\u044c Raspberry \u044d\u0442\u043e \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u0446\u0435\u043d\u043d\u044b\u0439 \u043c\u0435\u0445, \u043d\u043e \u0438 \u0432\u043f\u043e\u043b\u043d\u0435 \u043c\u043e\u0449\u043d\u044b\u0439 fanless-\u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440 \u0441 Linux. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u043c\u044b \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043f\u043e\u043b\u0435\u0437\u043d\u044b\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 Raspberry Pi, \u0434\u043b\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043a\u043e\u0434 \u043f\u0438\u0441\u0430\u0442\u044c \u043d\u0435 \u043f\u0440\u0438\u0434\u0435\u0442\u0441\u044f \u0441\u043e\u0432\u0441\u0435\u043c. \u0414\u043b\u044f \u0442\u0435\u0445 \u043a\u043e\u043c\u0443 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e, \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e\u0441\u0442\u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":39480,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-39479","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0438\u0432\u0435\u0442 \u0425\u0430\u0431\u0440. 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