{"id":443,"date":"2025-03-14T17:10:02","date_gmt":"2025-03-14T17:10:02","guid":{"rendered":"https:\/\/alphahex.com.br\/?p=443"},"modified":"2025-03-20T19:52:45","modified_gmt":"2025-03-20T19:52:45","slug":"lendo-coordenadas-gps-direto-da-pagina-nmea-esp32-plataformio","status":"publish","type":"post","link":"https:\/\/alphahex.com.br\/en\/lendo-coordenadas-gps-direto-da-pagina-nmea-esp32-plataformio\/","title":{"rendered":"GPS coordinates directly from the NMEA page with ESP32 and PlataformIO"},"content":{"rendered":"

In this article I will demonstrate how to collect GPS coordinates directly from the page NMEA<\/strong> (National Marine Electronics Association). This format is a standard used for communicating navigation and position data from GPS systems.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The data sent by the GPS to the serial port usually consists of several sentences (text strings) in NMEA format, with information about the position, time, speed, direction and other parameters. Each NMEA sentence begins with a character “$”<\/strong> and is followed by information that is separated by commas.<\/p>\n\n\n\n

Here is an example of a typical NMEA sentence sent by a GPS module:<\/p>\n\n\n\n

$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47<\/p>\n\n\n\n

With the hardware configured, this simple code and a GPS module connected to the ESP32, you will see in the terminal the same content shown in the photo above:<\/p>\n\n\n\n

<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
void<\/span> <\/span>loop<\/span>() {<\/span><\/span>\n  <\/span>while<\/span> (<\/span>Serial2<\/span>.<\/span>available<\/span>()) {<\/span><\/span>\n    <\/span>char<\/span> c = <\/span>Serial2<\/span>.<\/span>read<\/span>();<\/span><\/span>\n    <\/span>Serial<\/span>.<\/span>print<\/span>(c);<\/span><\/span>\n  }<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
In this tutorial, we will create a Task in FreeRTOS that performs the continuous reading of selected data on this page, allowing its use in any application.<\/strong><\/p>\n\n\n\n
For this, we will use an ESP32 S3 WROOM -1 development module and a Ublox Neo M7 GPS module. However, it works with any ESP32 and GPS module:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
    \n
  • GPS VCC<\/strong> \u2192 3.3V of ESP32-S3<\/strong><\/li>\n\n\n\n
  • GPS GND<\/strong> \u2192 GND of ESP32-S3<\/strong><\/li>\n\n\n\n
  • GPS TX<\/strong> \u2192 RX2 (GPIO16) of ESP32-S3<\/strong><\/li>\n\n\n\n
  • GPS RX<\/strong> \u2192 TX2 (GPIO17) of ESP32-S3<\/strong><\/li>\n<\/ul>\n\n\n\n
    Connecting ESP to Note and Creating the Project in VS Code<\/strong><\/p>\n\n\n\n
    After connecting the ESP32<\/strong> to GPS<\/strong>, you can now connect it to your computer using a cable USB<\/strong>.<\/p>\n\n\n\n
    \ud83d\udccc Creating the Project in VS Code with PlatformIO<\/h3>\n\n\n\n
    1\ufe0f\u20e3 Open VS Code<\/strong> and go to the PlatformIO<\/strong>.
    2\ufe0f\u20e3 Click on Create New Project<\/strong>.
    3\ufe0f\u20e3 During setup, select:<\/p>\n\n\n\n