BMP280, wifi connection and http server /temp

.gitignore

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+build
+managed_components
+.cache

thermo-sensor/CMakeLists.txt

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+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.22)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(thermo-sensor)

thermo-sensor/dependencies.lock

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+dependencies:
+  esp-idf-lib/bmp280:
+    component_hash: 82b01a37c200ed66a6c451026e2afdbe8046c6f702d41085e5a1d83aec3a90d8
+    dependencies:
+    - name: esp-idf-lib/esp_idf_lib_helpers
+      registry_url: https://components.espressif.com
+      require: private
+      version: '*'
+    - name: esp-idf-lib/i2cdev
+      registry_url: https://components.espressif.com
+      require: private
+      version: '*'
+    source:
+      registry_url: https://components.espressif.com/
+      type: service
+    targets:
+    - esp32
+    - esp32c2
+    - esp32c3
+    - esp32c5
+    - esp32c6
+    - esp32c61
+    - esp32h2
+    - esp32p4
+    - esp32s2
+    - esp32s3
+    version: 1.0.7
+  esp-idf-lib/esp_idf_lib_helpers:
+    component_hash: 689853bb8993434f9556af0f2816e808bf77b5d22100144b21f3519993daf237
+    dependencies: []
+    source:
+      registry_url: https://components.espressif.com
+      type: service
+    targets:
+    - esp32
+    - esp32c2
+    - esp32c3
+    - esp32c5
+    - esp32c6
+    - esp32c61
+    - esp32h2
+    - esp32p4
+    - esp32s2
+    - esp32s3
+    version: 1.4.0
+  esp-idf-lib/i2cdev:
+    component_hash: ad8981cc64533dcaced5107d72e42bcebe79345e194e82795792af531b300ce3
+    dependencies:
+    - name: esp-idf-lib/esp_idf_lib_helpers
+      registry_url: https://components.espressif.com
+      require: private
+      version: '*'
+    source:
+      registry_url: https://components.espressif.com
+      type: service
+    targets:
+    - esp32
+    - esp32c2
+    - esp32c3
+    - esp32c5
+    - esp32c6
+    - esp32c61
+    - esp32h2
+    - esp32p4
+    - esp32s2
+    - esp32s3
+    version: 2.1.2
+  idf:
+    source:
+      type: idf
+    version: 6.1.0
+direct_dependencies:
+- esp-idf-lib/bmp280
+- idf
+manifest_hash: e9139083c387eac863d68b0a593ed1c2631dc643670305c76e9d8ac18ee8f285
+target: esp32
+version: 3.0.0

thermo-sensor/main/CMakeLists.txt

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+idf_component_register(SRCS "thermo-sensor.c"
+                    INCLUDE_DIRS ".")

thermo-sensor/main/idf_component.yml

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+## IDF Component Manager Manifest File
+dependencies:
+  ## Required IDF version
+  idf:
+    version: '>=4.1.0'
+  # # Put list of dependencies here
+  # # For components maintained by Espressif:
+  # component: "~1.0.0"
+  # # For 3rd party components:
+  # username/component: ">=1.0.0,<2.0.0"
+  # username2/component2:
+  #   version: "~1.0.0"
+  #   # For transient dependencies `public` flag can be set.
+  #   # `public` flag doesn't have an effect dependencies of the `main` component.
+  #   # All dependencies of `main` are public by default.
+  #   public: true
+  esp-idf-lib/bmp280: '*'

thermo-sensor/main/thermo-sensor.c

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+#include <stdio.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <esp_system.h>
+#include <bmp280.h>
+#include <string.h>
+#include "freertos/event_groups.h"
+#include "esp_event.h"
+#include "esp_wifi.h"
+#include "esp_log.h"
+#include "nvs_flash.h"
+#include "esp_http_server.h"
+
+#define I2C_MASTER_SDA 19
+#define I2C_MASTER_SCL 23
+
+#define WIFI_CONNECTED_BIT BIT0
+#define WIFI_FAIL_BIT      BIT1
+
+#define WIFI_SSID  "TP-Link_8D0E"
+#define WIFI_PASS  "49824643"
+
+static const char *TAG = "thermo_sensor";
+static EventGroupHandle_t s_wifi_event_group;
+static float last_temperature = 0.0f;
+
+static void wifi_event_handler(void* arg, esp_event_base_t event_base,
+                            int32_t event_id, void* event_data)
+{
+    static int s_retry_num = 0;
+    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
+        esp_wifi_connect();
+    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
+        if (s_retry_num < 5) {
+            esp_wifi_connect();
+            s_retry_num++;
+            ESP_LOGI(TAG, "Ponawianie połączenia z AP...");
+        } else {
+            xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
+        }
+        ESP_LOGI(TAG, "Połączenie z AP nie powiodło się");
+    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
+        ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
+        ESP_LOGI(TAG, "Uzyskano IP:" IPSTR, IP2STR(&event->ip_info.ip));
+        s_retry_num = 0;
+        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
+    }
+}
+
+void wifi_init_sta(void)
+{
+    s_wifi_event_group = xEventGroupCreate();
+
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_netif_create_default_wifi_sta();
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+
+    esp_event_handler_instance_t instance_any_id;
+    esp_event_handler_instance_t instance_got_ip;
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
+                                                        ESP_EVENT_ANY_ID,
+                                                        &wifi_event_handler,
+                                                        NULL,
+                                                        &instance_any_id));
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
+                                                        IP_EVENT_STA_GOT_IP,
+                                                        &wifi_event_handler,
+                                                        NULL,
+                                                        &instance_got_ip));
+
+    wifi_config_t wifi_config = {
+        .sta = {
+            .ssid = WIFI_SSID,
+            .password = WIFI_PASS,
+        },
+    };
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
+    ESP_ERROR_CHECK(esp_wifi_start());
+
+    ESP_LOGI(TAG, "Inicjalizacja wifi_init_sta zakończona.");
+
+    // Czekaj na połączenie lub błąd
+    EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
+            WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
+            pdFALSE,
+            pdFALSE,
+            portMAX_DELAY);
+
+    if (bits & WIFI_CONNECTED_BIT) {
+        ESP_LOGI(TAG, "Połączono z sieci AP SSID:%s", WIFI_SSID);
+    } else if (bits & WIFI_FAIL_BIT) {
+        ESP_LOGI(TAG, "Błąd połączenia z SSID:%s", WIFI_SSID);
+    } else {
+        ESP_LOGE(TAG, "NIEOCZEKIWANE ZDARZENIE");
+    }
+}
+
+void bmp280_test(void *pvParameters)
+{
+    bmp280_params_t params;
+    bmp280_init_default_params(&params);
+    bmp280_t dev;
+    memset(&dev, 0, sizeof(bmp280_t));
+
+    ESP_ERROR_CHECK(bmp280_init_desc(&dev, BMP280_I2C_ADDRESS_0, 0, I2C_MASTER_SDA, I2C_MASTER_SCL));
+    ESP_ERROR_CHECK(bmp280_init(&dev, &params));
+
+    bool bme280p = dev.id == BME280_CHIP_ID;
+    printf("BMP280: found %s\n", bme280p ? "BME280" : "BMP280");
+
+    float pressure, temperature, humidity;
+
+    while (1)
+    {
+        vTaskDelay(pdMS_TO_TICKS(500));
+        if (bmp280_read_float(&dev, &temperature, &pressure, &humidity) != ESP_OK)
+        {
+            printf("Temperature/pressure reading failed\n");
+            continue;
+        }
+
+        /* float is used in printf(). you need non-default configuration in
+         * sdkconfig for ESP8266, which is enabled by default for this
+         * example. see sdkconfig.defaults.esp8266
+         */
+        last_temperature = temperature;
+        printf("Pressure: %.2f Pa, Temperature: %.2f C", pressure, temperature);
+        if (bme280p)
+            printf(", Humidity: %.2f\n", humidity);
+        else
+            printf("\n");
+    }
+}
+
+static esp_err_t get_temp_handler(httpd_req_t *req)
+{
+    float current_temp = last_temperature;
+    char response_json[64];
+    snprintf(response_json, sizeof(response_json), "{\"temperature\": %.1f}", current_temp);
+
+    httpd_resp_set_type(req, "application/json");
+
+    httpd_resp_send(req, response_json, HTTPD_RESP_USE_STRLEN);
+
+    return ESP_OK;
+}
+
+static const httpd_uri_t temp_uri = {
+    .uri       = "/temp",
+    .method    = HTTP_GET,
+    .handler   = get_temp_handler,
+    .user_ctx  = NULL
+};
+
+httpd_handle_t start_webserver(void)
+{
+    httpd_handle_t server = NULL;
+    httpd_config_t config = HTTPD_DEFAULT_CONFIG();
+
+    ESP_LOGI(TAG, "Uruchamianie serwera na porcie: %d", config.server_port);
+    if (httpd_start(&server, &config) == ESP_OK) {
+        // Rejestracja handlera dla GET /temp
+        httpd_register_uri_handler(server, &temp_uri);
+        return server;
+    }
+
+    ESP_LOGE(TAG, "Błąd podczas uruchamiania serwera!");
+    return NULL;
+}
+
+void app_main()
+{
+    esp_err_t ret = nvs_flash_init();
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+      ESP_ERROR_CHECK(nvs_flash_erase());
+      ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+    wifi_init_sta();
+
+    start_webserver();
+
+    ESP_ERROR_CHECK(i2cdev_init());
+    xTaskCreatePinnedToCore(bmp280_test, "bmp280_test", configMINIMAL_STACK_SIZE * 8, NULL, 5, NULL, APP_CPU_NUM);
+}
+