{"id":20128,"date":"2019-07-16T00:00:00","date_gmt":"2019-07-16T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/maquina-entrega-lanches-parte-2-eletronicos-tecnologia\/"},"modified":"2026-09-14T22:07:24","modified_gmt":"2026-09-14T22:07:24","slug":"maquina-entrega-lanches-parte-2-eletronicos-tecnologia","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/pt\/blog\/dev-life\/maquina-entrega-lanches-parte-2-eletronicos-tecnologia\/","title":{"rendered":"M\u00e1quina de entrega de lanches: parte 2, os eletr\u00f4nicos e a tecnologia"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Antes de entrarmos na parte t\u00e9cnica, se voc\u00ea ainda n\u00e3o leu nosso\u00a0<a href=\"\/?blog_category=snack-delivery-machine-part-1-mechanics\" target=\"_tabs\" rel=\"noopener noreferrer\">post anterior<\/a>\u00a0sobre a nossa maravilhosa m\u00e1quina de lanches, d\u00ea uma olhada nele primeiro! Compramos um distribuidor de lanches comum e o transformamos em um rob\u00f4, mas agora \u00e9 hora de dar a ele um c\u00e9rebro. E, por c\u00e9rebro, queremos dizer um Raspberry Pi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se voc\u00ea leu sobre alguns de nossos outros projetos mec\u00e2nicos, talvez tenha notado que costumamos usar um Raspberry Pi para qualquer hack de hardware. Eles s\u00e3o f\u00e1ceis de configurar, t\u00eam muitas extens\u00f5es e quase todo mundo adora brincar com eles. Foi a escolha perfeita para o que quer\u00edamos realizar \u2014 a distribui\u00e7\u00e3o automatizada de lanches definitiva.<\/p>\n\n\n\r\n    <nav data-content-type=\"longform\" class=\"toc-block longform-spacings px-5 py-6 px-md-6 px-lg-7 py-md-7 bg-light fs-sm rounded-lg\" aria-labelledby=\"toc-title-2165\"><p class=\"h5 m-0\" id=\"toc-title-2165\">\u00cdndice<\/p><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">01<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#controle-do-motor-de-passo\">Controle do motor de passo<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">02<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#energia\">Energia<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">03<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#juntando-todas-as-pecas\">Juntando todas as pe\u00e7as<\/a><\/div><\/div><\/nav>\n\n\n<h2 class=\"wp-block-heading\">Controle do motor de passo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Falando em extens\u00f5es, uma das op\u00e7\u00f5es dispon\u00edveis \u00e9 o\u00a0<a href=\"https:\/\/www.adafruit.com\/product\/2348\" target=\"_tabs\" rel=\"noopener noreferrer\">Adafruit DC &amp; Stepper Motor HAT<\/a>, que parece ser perfeitamente adequado para n\u00f3s.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4000\" width=\"970\" height=\"728\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2348-02.jpg\" alt=\"2348-02\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2348-02.jpg 970w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2348-02-300x225.jpg 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2348-02-768x576.jpg 768w\" sizes=\"(max-width: 970px) 100vw, 970px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A placa consiste em um controlador de\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Pulse-width_modulation\" target=\"_tabs\" rel=\"noopener noreferrer\">modula\u00e7\u00e3o por largura de pulso<\/a>\u00a0(PWM)\u00a0<a href=\"https:\/\/cdn-shop.adafruit.com\/datasheets\/PCA9685.pdf\" target=\"_tabs\" rel=\"noopener noreferrer\">PCA9685<\/a>\u00a0e 2 drivers de motor baseados no\u00a0<a href=\"https:\/\/cdn-shop.adafruit.com\/datasheets\/TB6612FNG_datasheet_en_20121101.pdf\" target=\"_tabs\" rel=\"noopener noreferrer\">TB6612FNG<\/a>. O controlador recebe os comandos atrav\u00e9s do barramento\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/I%C2%B2C\" target=\"_tabs\" rel=\"noopener noreferrer\">I2C<\/a>\u00a0do Pi e os traduz em sinais PWM adequados. Esses sinais de baixa tens\u00e3o entram nos drivers e controlam as sa\u00eddas de 12 V para alimentar os motores.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nossos motores s\u00e3o\u00a0<a href=\"https:\/\/learn.adafruit.com\/all-about-stepper-motors\/types-of-steppers#coils-and-phases-2-13\" target=\"_tabs\" rel=\"noopener noreferrer\">motores de passo bipolares<\/a>, o que significa que eles consistem em 2 grupos de bobinas que precisam ser energizadas com polaridade alternada. Felizmente, o TB6612FNG foi projetado para trabalhar com motores duplos, de modo que cada driver ser\u00e1 dedicado ao seu pr\u00f3prio motor de passo. Os drivers t\u00eam um circuito de distribui\u00e7\u00e3o de energia separado, que abordaremos na pr\u00f3xima se\u00e7\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Energia<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Adquirimos nosso Pi da\u00a0<a href=\"https:\/\/www.canakit.com\/\" target=\"_tabs\" rel=\"noopener noreferrer\">CanaKit<\/a>\u00a0e ele veio com um adaptador de energia b\u00e1sico micro USB de 2,5 A e 5 V. Os motores no HAT precisam de 12 V e devem ser alimentados separadamente. Como eles consomem 350 mA cada, precisamos fornecer pelo menos 700 mA para eles. Os drivers consomem cerca de 2 mA cada, o que n\u00e3o \u00e9 t\u00e3o significativo. No entanto, ao projetar qualquer sistema (mesmo que seja de software), recomendamos fortemente um fator de seguran\u00e7a de 2 a 3, ou at\u00e9 mais.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para criar sistemas robustos e seguros, precisamos levar em conta a nossa ignor\u00e2ncia sobre o mundo real. Tome como exemplo a\u00a0<a href=\"https:\/\/www.aps.org\/publications\/apsnews\/201611\/physicshistory.cfm\" target=\"_tabs\" rel=\"noopener noreferrer\">Ponte de Tacoma Narrows<\/a>\u00a0vs. a Ponte do Brooklyn. A Ponte de Tacoma Narrows n\u00e3o tinha um fator de seguran\u00e7a e, inevitavelmente, desabou. Em contrapartida, a Ponte do Brooklyn foi constru\u00edda com um fator de seguran\u00e7a de 5 a 6 e continua de p\u00e9 at\u00e9 hoje.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Felizmente, existem muitas op\u00e7\u00f5es de fontes de alimenta\u00e7\u00e3o para manter a nossa m\u00e1quina de lanches segura. N\u00f3s simplesmente optamos por uma fonte de alimenta\u00e7\u00e3o de\u00a0<a href=\"https:\/\/www.amazon.com\/gp\/product\/B073QTNF9F\/ref=pe_2262140_193471420_b2b_ap_email_product\" target=\"_tabs\" rel=\"noopener noreferrer\">5 A<\/a>\u00a0. Se voc\u00ea ainda tem d\u00favidas sobre como conectar a fonte de alimenta\u00e7\u00e3o com seguran\u00e7a, este\u00a0<a href=\"https:\/\/learn.adafruit.com\/adafruit-dc-and-stepper-motor-hat-for-raspberry-pi\/powering-motors\" target=\"_tabs\" rel=\"noopener noreferrer\">guia<\/a>\u00a0pode ajudar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Juntando todas as pe\u00e7as<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Agora que t\u00ednhamos tudo o que precis\u00e1vamos para concluir a m\u00e1quina de lanches, era hora de montar tudo. Hora da foto!<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4001\" width=\"700\" height=\"1244\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/supplies-700x1244-1.png\" alt=\"supplies-700x1244\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/supplies-700x1244-1.png 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/supplies-700x1244-1-169x300.png 169w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/supplies-700x1244-1-576x1024.png 576w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de come\u00e7armos de verdade, tivemos que soldar o HAT.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4023\" width=\"700\" height=\"1244\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/solder_controller_1-700x1244-1.png\" alt=\"solder_controller_1-700x1244\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/solder_controller_1-700x1244-1.png 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/solder_controller_1-700x1244-1-169x300.png 169w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/solder_controller_1-700x1244-1-576x1024.png 576w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Depois, foi a hora de prender o conector de energia.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4033\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/speaker_wire_power.png\" alt=\"speaker_wire_power\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/speaker_wire_power.png 1024w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/speaker_wire_power-300x169.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/speaker_wire_power-768x432.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Com a energia no lugar, pudemos conectar os motores ao HAT.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4036\" width=\"700\" height=\"933\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Image-from-iOS-44-700x933-1.jpg\" alt=\"Image-from-iOS-44-700x933\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Image-from-iOS-44-700x933-1.jpg 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Image-from-iOS-44-700x933-1-225x300.jpg 225w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Para controlar o HAT via I2C, precisamos instalar o\u00a0<a href=\"https:\/\/github.com\/adafruit\/Adafruit_CircuitPython_MotorKit\" target=\"_tabs\" rel=\"noopener noreferrer\">Adafruit CircuitPython MotorKit<\/a>. A\u00a0<a href=\"https:\/\/learn.adafruit.com\/adafruit-dc-and-stepper-motor-hat-for-raspberry-pi\/installing-software\" target=\"_tabs\" rel=\"noopener noreferrer\">A instala\u00e7\u00e3o<\/a>\u00a0\u00e9 bem simples, e acabamos usando este\u00a0<a href=\"https:\/\/learn.adafruit.com\/adafruit-dc-and-stepper-motor-hat-for-raspberry-pi\/using-stepper-motors\" target=\"_tabs\" rel=\"noopener noreferrer\">guia<\/a>\u00a0para fazer os motores de passo funcionarem corretamente. Em nosso caso, criamos um bom algoritmo de vaiv\u00e9m e o ajustamos para distribuir a quantidade certa de lanches em uma \u00fanica execu\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aqui est\u00e1! Um prot\u00f3tipo funcional!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Como de costume, conectamos a m\u00e1quina ao Mailgun. Isso poderia ser feito de algumas maneiras diferentes e, como j\u00e1 abordamos isso em\u00a0<a href=\"\/?blog_category=mission-to-mars-pycon-2014\" target=\"_tabs\" rel=\"noopener noreferrer\">outro<\/a>\u00a0<a href=\"\/?blog_category=hardware-fun-building-an-email-controlled-gun-for\" target=\"_tabs\" rel=\"noopener noreferrer\">posts<\/a>\u00a0, n\u00e3o vamos nos aprofundar nisso aqui. No entanto, h\u00e1 uma oportunidade interessante de transform\u00e1-la em um verdadeiro dispositivo de IoT.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4037\" width=\"700\" height=\"769\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/blurredinstructions-700x769-1.jpg\" alt=\"blurredinstructions-700x769\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/blurredinstructions-700x769-1.jpg 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/blurredinstructions-700x769-1-273x300.jpg 273w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">At\u00e9 agora, n\u00f3s a usamos apenas na cozinha para que nossos colegas do Mailgun possam se deliciar com M&amp;Ms como verdadeiros chefes. Ainda assim, ela j\u00e1 distribuiu doces deliciosos para muitas pessoas e rendeu boas risadas quando foi desconectada e acabou entregando M&amp;Ms\u00a0<b>em excesso\u00a0<\/b>ao ser conectada novamente.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Antes de entrarmos na parte t\u00e9cnica, se voc\u00ea ainda n\u00e3o leu nosso post anterior sobre a nossa maravilhosa m\u00e1quina de lanches, d\u00ea uma olhada nele primeiro! Compramos um distribuidor de lanches comum e o transformamos em um rob\u00f4, mas agora \u00e9 hora de dar a ele um c\u00e9rebro. E, por c\u00e9rebro, queremos dizer um Raspberry Pi.<\/p>\n","protected":false},"author":14,"featured_media":3952,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[19],"class_list":["post-20128","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-dev-life"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>M\u00e1quina de entrega de lanches \u2013 parte 2, os eletr\u00f4nicos e a tecnologia - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"O que acontece quando voc\u00ea pega uma m\u00e1quina de lanches e a conecta a um Raspberry Pi? 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