{"id":3819,"date":"2025-06-01T22:07:25","date_gmt":"2025-06-02T01:07:25","guid":{"rendered":"https:\/\/gadotti.eng.br\/?page_id=3819"},"modified":"2025-07-06T14:38:46","modified_gmt":"2025-07-06T17:38:46","slug":"miniboardrak3172","status":"publish","type":"page","link":"https:\/\/gadotti.eng.br\/index.php\/miniboardrak3172\/","title":{"rendered":"MiniBoardRAK3172"},"content":{"rendered":"\t\t
\n\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

This project uses the RAK3172 module as main controller (no need for AT commands from a host controller). It has inputs, hall switches, motion sensor, external memory and LoRa communication. Targeting small size and low power consumption, it can be powered by a single or double AA cell, solar panel or connected to the mains.<\/p>

For the SW development I am planning to use the RUI3 APIs from RAKwirelles<\/a>. Internal connectors are available to connect the ST-Link in-circuit debugger \/ programmer interface and serial monitors.<\/p>

The hardware design was done with the KiCad<\/a> software. It is an open source, easy to use and very good CAD tool. Really liked the results.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Block Diagram<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Main Functions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t
  • Alternative power supply options (assembly option), reverse polarity protected:
    Line Supply: input voltage range from 6V to 32V, with a Buck converter to 3.3V;
    Battery Supply: input voltage range from 1.8V to 5.5V, with a Buck-Boost converter to 3.3V;
    Holder for 2 x 1.5V (series) AA batteries, 1 or 2 x 3.6V (semi-parallel) AA batteries for longer autonomy;
    One battery cell (Bat2) can be used as a backup for the Line Supply input.<\/li>
  • RAK3172 module with an internal uController for the LoRaWAN stack and the application software: Arm Cortex M4 32bits MCU, with 256kB Flash and 64kB SRAM;<\/li>
  • LoRaWAN communication, Class A, B or C according to LoRaWAN specification 1.0.4, performed by the RAK3172 module. Supported bands: EU433, CN470, RU864, IN865, EU868, AU915, US915, KR920, RU864, LA915 and AS923. Ipex 1 connector for external antenna;<\/li>
  • Four Digital \/ Analog Inputs, configurable for High or Low active or 4-20mA sensor signal measurement (assembly option);<\/li>
  • Possibility to connect the external temperature sensor ds18b20;<\/li>
  • Two Hall effect switches, omnipolar, push-pull output;<\/li>
  • 6-Axis motion sensor, IMU (3-Axis Accelerometer and 3-Axis Gyroscope);<\/li>
  • I2C port for external Temperature and Humidity sensor;<\/li>
  • 8kbit serial EEPROM for system configuration;<\/li>
  • 8Mbit or 16Mbit serial flash memory for data logging;<\/li>
  • Two LEDs for visual interface and warnings.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
    \n\t\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t

    PCB<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t

    FR4, two layers, 75 x 50 mm<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

    \n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t
    \n\t\t\t
    <\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
    \n\t\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t

    Proposed Enclosure<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
    \n\t\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t

    First manual assembly to start testing<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
    \n\t\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t

    03\/Jun\/2025<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

    This project uses the RAK3172 module as main controller (no need for AT commands from a host controller). It has inputs, hall switches, motion sensor, external memory and LoRa communication. Targeting small size and low power consumption, it can be powered by a single or double AA cell, solar panel or connected to the mains. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-3819","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/gadotti.eng.br\/index.php\/wp-json\/wp\/v2\/pages\/3819","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gadotti.eng.br\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/gadotti.eng.br\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/gadotti.eng.br\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gadotti.eng.br\/index.php\/wp-json\/wp\/v2\/comments?post=3819"}],"version-history":[{"count":38,"href":"https:\/\/gadotti.eng.br\/index.php\/wp-json\/wp\/v2\/pages\/3819\/revisions"}],"predecessor-version":[{"id":3908,"href":"https:\/\/gadotti.eng.br\/index.php\/wp-json\/wp\/v2\/pages\/3819\/revisions\/3908"}],"wp:attachment":[{"href":"https:\/\/gadotti.eng.br\/index.php\/wp-json\/wp\/v2\/media?parent=3819"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}