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BMP280, wifi connection and http server /temp

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mateusz
2026-09-10 21:27:34 +02:00
commit 1a11a0db99
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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);
}
thermo-sensor/sdkconfig
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