{"id":19911,"date":"2019-07-16T00:00:00","date_gmt":"2019-07-16T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/maquina-de-entrega-de-snacks-parte-2-componentes-electronicos-y-tecnologia\/"},"modified":"2026-09-14T18:32:41","modified_gmt":"2026-09-14T18:32:41","slug":"maquina-de-entrega-de-snacks-parte-2-componentes-electronicos-y-tecnologia","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/es\/blog\/dev-life\/maquina-de-entrega-de-snacks-parte-2-componentes-electronicos-y-tecnologia\/","title":{"rendered":"M\u00e1quina de entrega de snacks: parte 2, componentes electr\u00f3nicos y tecnolog\u00eda"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Antes de entrar en detalles t\u00e9cnicos, si no has le\u00eddo nuestro\u00a0<a href=\"\/?blog_category=snack-delivery-machine-part-1-mechanics\" target=\"_tabs\" rel=\"noopener noreferrer\">art\u00edculo anterior<\/a>\u00a0sobre nuestra maravillosa m\u00e1quina de snacks, \u00a1\u00e9chale un vistazo primero! Compramos un dispensador de snacks convencional y lo convertimos en un robot, pero ahora es el momento de darle un cerebro. Y con cerebro, nos referimos a una Raspberry Pi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si has le\u00eddo sobre algunos de nuestros otros proyectos mec\u00e1nicos, habr\u00e1s notado que solemos usar una Raspberry Pi para cualquier modificaci\u00f3n de hardware. Son f\u00e1ciles de configurar, tienen un mont\u00f3n de extensiones y a casi todo el mundo le encanta jugar con ellas. Era la opci\u00f3n perfecta para lo que quer\u00edamos lograr: la automatizaci\u00f3n de snacks 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-4202\"><p class=\"h5 m-0\" id=\"toc-title-4202\">\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=\"#control-de-motores-paso-a-paso\">Control de motores paso a paso<\/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=\"#alimentacion\">Alimentaci\u00f3n<\/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=\"#uniendo-todas-las-piezas\">Uniendo todas las piezas<\/a><\/div><\/div><\/nav>\n\n\n<h2 class=\"wp-block-heading\">Control de motores paso a paso<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Hablando de extensiones, una de las que hay disponibles es el\u00a0<a href=\"https:\/\/www.adafruit.com\/product\/2348\" target=\"_tabs\" rel=\"noopener noreferrer\">Adafruit DC &amp; Stepper Motor HAT<\/a>, que parece ser perfecta para nosotros.<\/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\">La placa consta de un controlador de\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Pulse-width_modulation\" target=\"_tabs\" rel=\"noopener noreferrer\">modulaci\u00f3n por ancho de pulsos<\/a>\u00a0\u00a0<a href=\"https:\/\/cdn-shop.adafruit.com\/datasheets\/PCA9685.pdf\" target=\"_tabs\" rel=\"noopener noreferrer\">PCA9685<\/a>\u00a0y dos controladores de motor basados en el\u00a0<a href=\"https:\/\/cdn-shop.adafruit.com\/datasheets\/TB6612FNG_datasheet_en_20121101.pdf\" target=\"_tabs\" rel=\"noopener noreferrer\">TB6612FNG<\/a>. El controlador recibe los comandos a trav\u00e9s del bus\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/I%C2%B2C\" target=\"_tabs\" rel=\"noopener noreferrer\">I2C<\/a>\u00a0 de la Raspberry Pi y los traduce a las se\u00f1ales PWM adecuadas. Estas se\u00f1ales de bajo voltaje entran en los controladores y manejan las salidas de 12 V para alimentar los motores.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nuestros motores son\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 paso a paso bipolares<\/a>, lo que significa que constan de dos grupos de bobinas que deben recibir energ\u00eda con polaridad alterna. Por suerte, el TB6612FNG est\u00e1 dise\u00f1ado para funcionar con motores duales, por lo que cada controlador se dedicar\u00e1 a su propio motor paso a paso. Los controladores tienen un circuito de distribuci\u00f3n de energ\u00eda independiente, que veremos en la siguiente secci\u00f3n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Alimentaci\u00f3n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Compramos nuestra Raspberry Pi en\u00a0<a href=\"https:\/\/www.canakit.com\/\" target=\"_tabs\" rel=\"noopener noreferrer\">CanaKit<\/a>\u00a0y ven\u00eda con un adaptador de corriente b\u00e1sico micro USB de 2,5 A y 5 V. Los motores del HAT necesitan 12 V y deben alimentarse por separado. Dado que consumen 350 mA cada uno, debemos proporcionarles al menos 700 mA. Los controladores consumen unos 2 mA cada uno, lo cual no es tan significativo. Sin embargo, al dise\u00f1ar cualquier sistema (incluso uno de software), recomendamos encarecidamente un factor de seguridad de dos a tres, o incluso m\u00e1s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para construir sistemas seguros y robustos, tenemos que tener en cuenta nuestra falta de conocimientos sobre el mundo real. Tomemos como ejemplo el\u00a0<a href=\"https:\/\/www.aps.org\/publications\/apsnews\/201611\/physicshistory.cfm\" target=\"_tabs\" rel=\"noopener noreferrer\">puente de Tacoma Narrows<\/a>\u00a0 frente al puente de Brooklyn. El puente de Tacoma Narrows no ten\u00eda ning\u00fan factor de seguridad e inevitablemente se derrumb\u00f3. Por el contrario, el puente de Brooklyn se construy\u00f3 con un factor de seguridad de cinco a seis y sigue en pie a d\u00eda de hoy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Afortunadamente, hay much\u00edsimas opciones en lo que respecta a fuentes de alimentaci\u00f3n para mantener nuestra m\u00e1quina de snacks segura y en buenas condiciones. Nosotros optamos por una fuente de alimentaci\u00f3n 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. Si todav\u00eda te preocupa c\u00f3mo conectar la fuente de alimentaci\u00f3n de forma segura, esto\u00a0<a href=\"https:\/\/learn.adafruit.com\/adafruit-dc-and-stepper-motor-hat-for-raspberry-pi\/powering-motors\" target=\"_tabs\" rel=\"noopener noreferrer\">gu\u00eda<\/a>\u00a0puede ayudarte.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Uniendo todas las piezas<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ahora que ten\u00edamos todo lo necesario para terminar la m\u00e1quina de snacks, era el momento de montarlo todo. \u00a1Hora de las fotos!<\/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 ponernos en marcha, tuvimos que soldar el 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\">Luego lleg\u00f3 el momento de fijar el conector de alimentaci\u00f3n.<\/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\">Con la alimentaci\u00f3n lista, pudimos conectar los motores al 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 el HAT a trav\u00e9s de I2C, necesitamos instalar el\u00a0<a href=\"https:\/\/github.com\/adafruit\/Adafruit_CircuitPython_MotorKit\" target=\"_tabs\" rel=\"noopener noreferrer\">Adafruit CircuitPython MotorKit<\/a>. La\u00a0<a href=\"https:\/\/learn.adafruit.com\/adafruit-dc-and-stepper-motor-hat-for-raspberry-pi\/installing-software\" target=\"_tabs\" rel=\"noopener noreferrer\">cuya instalaci\u00f3n<\/a>\u00a0 es bastante sencilla, y terminamos usando este c\u00f3digo\u00a0<a href=\"https:\/\/learn.adafruit.com\/adafruit-dc-and-stepper-motor-hat-for-raspberry-pi\/using-stepper-motors\" target=\"_tabs\" rel=\"noopener noreferrer\">gu\u00eda<\/a>\u00a0para que los motores paso a paso funcionaran correctamente. En nuestro caso, creamos un algoritmo de vaiv\u00e9n decente y lo ajustamos para dispensar la cantidad correcta de snacks en una sola pasada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00a1Aqu\u00ed lo tienes! \u00a1Un prototipo funcional!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Como de costumbre, conectamos la m\u00e1quina a Mailgun. Esto podr\u00eda hacerse de diferentes maneras y, como ya lo hemos tratado en otros\u00a0<a href=\"\/?blog_category=mission-to-mars-pycon-2014\" target=\"_tabs\" rel=\"noopener noreferrer\">otra opci\u00f3n<\/a>\u00a0<a href=\"\/?blog_category=hardware-fun-building-an-email-controlled-gun-for\" target=\"_tabs\" rel=\"noopener noreferrer\">art\u00edculos<\/a>\u00a0 no vamos a centrarnos en ello aqu\u00ed. Sin embargo, existe una oportunidad interesante para convertirlo en un verdadero dispositivo 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\">Hasta ahora solo la usamos en la cocina para que los compa\u00f1eros de Mailgun puedan darse un fest\u00edn de M&amp;Ms a lo grande. Aun as\u00ed, ha repartido deliciosos dulces a mucha gente, y nos ha provocado bastantes risas cuando se desenchuf\u00f3 y luego entreg\u00f3\u00a0<b>demasiados\u00a0<\/b>M&amp;Ms una vez que volvi\u00f3 a enchufarse.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Antes de entrar en detalles t\u00e9cnicos, si no has le\u00eddo nuestro art\u00edculo anterior sobre nuestra maravillosa m\u00e1quina de snacks, \u00a1\u00e9chale un vistazo primero! Compramos un dispensador de snacks convencional y lo convertimos en un robot, pero ahora es el momento de darle un cerebro. Y con cerebro, nos referimos a una 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-19911","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 snacks: parte 2, componentes electr\u00f3nicos y tecnolog\u00eda - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"\u00bfQu\u00e9 ocurre cuando tienes una m\u00e1quina de snacks y la conectas a una Raspberry Pi? 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