mirror of
https://github.com/alexandrebobkov/ESP-Nodes.git
synced 2025-10-20 05:54:33 +00:00
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* ESP32 Temperature Node
|
|
|
|
BME280 I2C Slave Device
|
|
|
|
Author: Alexander Bobkov
|
|
Date: October 4, 2025
|
|
Modified: October 4, 2025
|
|
|
|
Sensor device uses BME280 to measure temperature, pressure and humidity and
|
|
outputs it to the serial port and publishes values to the MQTT topics.
|
|
|
|
Built and Compiled with ESP-IDF v5.4.1
|
|
Uses Espressif BME280 component: espressif/bme280: ^0.1.1
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include "freertos/FreeRTOS.h"
|
|
#include "freertos/task.h"
|
|
#include "esp_log.h"
|
|
#include "i2c_bus.h"
|
|
#include "bme280.h"
|
|
#include "config.h"
|
|
|
|
static const char *TAG = "esp32 node";
|
|
|
|
// The three variables for storing the sensor readings (float for decimals)
|
|
float temperature = 0.0f, humidity = 0.0f, pressure = 0.0f;
|
|
|
|
int i2c_master_port = 0;
|
|
// I2C bus handle
|
|
static i2c_bus_handle_t i2c_bus = NULL;
|
|
// BME280 device handle
|
|
static bme280_handle_t bme280 = NULL;
|
|
|
|
// I2C bus configuration struct
|
|
i2c_config_t conf = {
|
|
.mode = I2C_MODE_MASTER,
|
|
.sda_io_num = SDA_PIN,
|
|
.sda_pullup_en = GPIO_PULLUP_ENABLE,
|
|
.scl_io_num = SCL_PIN,
|
|
.sda_pullup_en = GPIO_PULLUP_ENABLE,
|
|
.master.clk_speed = I2C_FREQ_HZ,
|
|
.clk_flags= 0,
|
|
};
|
|
|
|
void app_main(void)
|
|
{
|
|
// Create the I2C bus and BME280 device handles
|
|
i2c_bus = i2c_bus_create(i2c_master_port, &conf);
|
|
bme280 = bme280_create(i2c_bus, BME280_I2C_ADDRESS_DEFAULT);
|
|
// Initialize the BME280 device
|
|
bme280_default_init(bme280);
|
|
|
|
// Set the BME280 sampling parameters
|
|
bme280_set_sampling(bme280, BME280_MODE_NORMAL, BME280_SAMPLING_X1, BME280_SAMPLING_X1, BME280_SAMPLING_X1, BME280_FILTER_OFF, BME280_STANDBY_MS_1000);
|
|
|
|
// Main loop to read and print the sensor values every 2 seconds
|
|
while (true) {
|
|
|
|
bme280_take_forced_measurement(bme280);
|
|
bme280_read_temperature(bme280, &temperature);
|
|
bme280_read_humidity(bme280, &humidity);
|
|
bme280_read_pressure(bme280, &pressure);
|
|
// Print the values to the serial console
|
|
printf(" %.1f, %.2f, %.2f \n", temperature, humidity, pressure);
|
|
|
|
vTaskDelay(2000/portTICK_PERIOD_MS);
|
|
}
|
|
} |