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https://github.com/alexandrebobkov/ESP-Nodes.git
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127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/* ESP32 Temperature Node
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BME280 I2C Slave Device
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Author: Alexander Bobkov
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Date: October 4, 2025
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Updated: October 7, 2025
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TO-DO: add Wi-Fi connection for MQTT publishing
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Sensor device uses BME280 to measure temperature, pressure and humidity and
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outputs it to the serial port and publishes values to the MQTT topics.
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Built and Compiled with ESP-IDF v5.4.1
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Uses Espressif BME280 component: espressif/bme280: ^0.1.1
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*/
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#include <stdio.h>
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#include "esp_log.h"
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#include "esp_crc.h"
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#include "esp_netif.h"
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#include "esp_now.h"
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#include "esp_mac.h"
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#include "esp_wifi.h"
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#include "esp_system.h"
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#include "mqtt_client.h"
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#include "esp_netif.h"
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#include "nvs_flash.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_log.h"
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#include "i2c_bus.h"
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#include "bme280.h"
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#include "config.h"
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#include "mqttronix.h"
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static const char *TAG = "esp32 node";
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// The three variables for storing the sensor readings (float for decimals)
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float temperature = 0.0f, humidity = 0.0f, pressure = 0.0f;
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int i2c_master_port = 0;
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// I2C bus handle
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static i2c_bus_handle_t i2c_bus = NULL;
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// BME280 device handle
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static bme280_handle_t bme280 = NULL;
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// I2C bus configuration struct
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i2c_config_t conf = {
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.mode = I2C_MODE_MASTER,
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.sda_io_num = SDA_PIN,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_io_num = SCL_PIN,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.master.clk_speed = I2C_FREQ_HZ,
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.clk_flags= 0,
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};
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// Task to read sensors values
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void read_sensors_task(void *arg)
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{
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while (1) {
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// Take a forced measurement
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bme280_take_forced_measurement(bme280);
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// Read temperature, humidity, and pressure values and save them into the variables
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bme280_read_temperature(bme280, &temperature);
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bme280_read_humidity(bme280, &humidity);
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bme280_read_pressure(bme280, &pressure);
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vTaskDelay(2000/portTICK_PERIOD_MS);
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}
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}
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// Task to print sensors values
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void print_sensors_task(void *arg)
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{
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while (1) {
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// Print the values to the serial console
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printf(" %.1f, %.2f, %.2f \n", temperature, humidity, pressure);
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mqttronix_update_temp (temperature);
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vTaskDelay(2500/portTICK_PERIOD_MS);
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}
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}
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void app_main(void)
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{
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// Initialize NVS before Wi-Fi
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esp_err_t ret = nvs_flash_init();
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if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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ESP_ERROR_CHECK(nvs_flash_erase());
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ret = nvs_flash_init();
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}
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ESP_ERROR_CHECK(ret);
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// Create the I2C bus and BME280 device handles
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i2c_bus = i2c_bus_create(i2c_master_port, &conf);
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bme280 = bme280_create(i2c_bus, BME280_I2C_ADDRESS_DEFAULT);
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// Initialize the BME280 device
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bme280_default_init(bme280);
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// Set the BME280 sampling parameters
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bme280_set_sampling(bme280, BME280_MODE_NORMAL,
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BME280_SAMPLING_X1, BME280_SAMPLING_X1, BME280_SAMPLING_X1,
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BME280_FILTER_OFF, BME280_STANDBY_MS_1000);
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// Create FreeRTOS tasks for reading and printing sensor values
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xTaskCreate(read_sensors_task, "read_sensors_task", 2048, NULL, 5, NULL);
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xTaskCreate(print_sensors_task, "print_sensors_task", 2048, NULL, 5, NULL);
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// Use wifi_init() for ESP-NOW and Wi-Fi setup
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wifi_init();
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mqttronix_start();
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// Main loop to read and print the sensor values every 2 seconds
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/*while (true) {
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bme280_take_forced_measurement(bme280);
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bme280_read_temperature(bme280, &temperature);
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bme280_read_humidity(bme280, &humidity);
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bme280_read_pressure(bme280, &pressure);
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// Print the values to the serial console
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printf(" %.1f, %.2f, %.2f \n", temperature, humidity, pressure);
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vTaskDelay(2000/portTICK_PERIOD_MS);
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}*/
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} |