--- title: "ESP32 GPS Test with W5500" url: "https://maker.wiznet.io/Benjamin/projects/esp32-gps-test-with-w5500/" markdown_url: "https://maker.wiznet.io/Benjamin/projects/esp32-gps-test-with-w5500/md" type: "UCC: User Created Content" author: "Dev-91" author_url: "https://github.com/Dev-91/ESP32_GPS_TEST" editor: "WIZnet" editor_url: "https://maker.wiznet.io/" original_author: "Dev-91" original_url: "https://github.com/Dev-91/ESP32_GPS_TEST" published: "2023-06-07" language: "en" tags: ["ESP32", "W5500", "C/C++"] hardware: ["WIZnet W5500", "Espressif ESP32-WROOM-32E", "SparkFun GPS-RTK2 Board - ZED-F9P (Qwiic)"] likes: 0 views: 2577 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # ESP32 GPS Test with W5500 > A project testing GPS data using the ESP32 chipset and testing Ethernet communication with the W5500 chip. Original author: Dev-91 (source: https://github.com/Dev-91/ESP32_GPS_TEST) ## Components - **WIZnet W5500** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5500)) - **Espressif ESP32-WROOM-32E** x 1 ([docs](https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf)) - **SparkFun GPS-RTK2 Board - ZED-F9P (Qwiic)** x 1 ([docs](https://learn.sparkfun.com/tutorials/gps-rtk2-hookup-guide?_ga=2.121381451.278798874.1657068782-1842012612.1651468433)) - Software: **Espressif ESP-IDF** WIZnet parts: W5500 ([Datasheet](https://docs.wiznet.io/Product/Chip/Ethernet/W5500/datasheet?utm_source=maker&utm_medium=project&utm_campaign=w5500), [product hub](https://maker.wiznet.io/products/w5500/)) ## Article ## Overview The above project focuses on obtaining and processing location information using the ESP32 development board and a GPS module, with the addition of Wiznet's W5500 to implement ioT over an Ethernet connection. ![](https://maker.wiznet.io/upload/ckeditor5/269591415%5F1688470556%2Epng) ## W5500 in code ```c #if CONFIG_USER_ETH_W5500_ENABLE == 0 // ethernet init &connection ESP_LOGI(TAG, "CONFIG_USER_ETH_W5500_ENABLE: %d", CONFIG_USER_ETH_W5500_ENABLE); spi_eth_module_config_t ethcfg = { .spi_cs_gpio = USER_ETH_SPI_CS_GPIO, .int_gpio = USER_ETH_SPI_INT_GPIO, .phy_reset_gpio = USER_ETH_SPI_PHY_RST_GPIO, .phy_addr = USER_ETH_SPI_PHY_ADDR_GPIO, }; ethernet_init(ðcfg); network_ret = ethernet_connection_check(); if (network_ret == 0) blink(USER_BLINK_GPIO, 100, 10); else blink(USER_BLINK_GPIO, 1000, 2); #endif ``` The part you are referring to involves initializing the W5500 Ethernet module and checking the connection status. If the connection is successful, it flashes 10 times quickly, and if the connection fails, it flashes 2 times slowly. From then on, when communicating with the server, it uses TCP communication to transfer data. ## Other important codes Include header files (lines 1-12): Include the necessary header files to enable ESP32 and its associated features and libraries. ```c #include #include #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/event_groups.h" #include "nvs_flash.h" #include "esp_system.h" #include "esp_event.h" #include "esp_sleep.h" #include "driver/uart.h" #include "nmea_parser.h" #include "tinyGPS.h" ``` Define the UART pin number and baud rate (lines 14-19): Set the UART pin and communication rate to connect with the GPS module. ```c #define TXD_PIN (GPIO_NUM_4) #define RXD_PIN (GPIO_NUM_5) #define GPS_UART_NUM UART_NUM_2 #define BUF_SIZE (1024) #define BAUD_RATE 9600 ``` Define location data structures and variables (lines 21-25): Define and initialize the structures and variables to store location information ```c typedef struct { float lat; float lon; } coordinate_t; static coordinate_t latest_coordinate = {0}; ``` The uart_init function (lines 39-54): Function to set up and initialize UART communication ```c void uart_init() { const uart_config_t uart_config = { .baud_rate = BAUD_RATE, .data_bits = UART_DATA_8_BITS, .parity = UART_PARITY_DISABLE, .stop_bits = UART_STOP_BITS_1, // ... }; // ... uart_param_config(GPS_UART_NUM, &uart_config); uart_set_pin(GPS_UART_NUM, TXD_PIN, RXD_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE); uart_driver_install(GPS_UART_NUM, BUF_SIZE * 2, 0, 0, NULL, 0); } ``` Call to the uart_read_bytes function (line 72): This is the part that reads in the data received from the UART ```c int num_bytes = uart_read_bytes(GPS_UART_NUM, buf, BUF_SIZE, 100 / portTICK_PERIOD_MS); ``` Processing GPS information (lines 74-95): This is the part where you use the NMEA parser to process the GPS information and store it in a structure ```c if (num_bytes > 0) { buf[num_bytes] = '\0'; nmea_parser_process("$GPRMC", buf); nmea_parser_process("$GPGGA", buf); ... latest_coordinate.lat = gps.location.lat(); latest_coordinate.lon = gps.location.lng(); ... } ``` An infinite loop within the main function (lines 100-114): This is the part where we iterate through the process of collecting and processing GPS information and output the results to a log ```c while (1) { read_gps_data(); print_gps_data(); vTaskDelay(5000 / portTICK_PERIOD_MS); } ``` These are the critical components of the code above, used to communicate between the ESP32 and the GPS module and to process location information. ## Improvement direction You can utilize the code above to create a variety of applications that use the GPS module. Here are a few examples: - Location-based services: You can create a service that uses GPS information to determine your current location and provide a map based on it. - Car navigation systems: You can use GPS information and map data to implement a car navigation system. - Log data collection: You can use GPS information to collect vehicle operation data and record it in log files for analysis. - Sports activity tracking: GPS information can be used to track sports activities such as running, climbing, and biking. - IoT-based location tracking systems: Use GPS information to track the location of devices and integrate with IoT services. ![](https://maker.wiznet.io/upload/ckeditor5/269591415%5F1688470217%2Epng) --- Source: https://maker.wiznet.io/Benjamin/projects/esp32-gps-test-with-w5500/