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69 lines
2.1 KiB
C
69 lines
2.1 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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Modified: October 4, 2025
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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 "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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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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void app_main(void)
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{
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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, BME280_SAMPLING_X1, BME280_SAMPLING_X1, BME280_SAMPLING_X1, BME280_FILTER_OFF, BME280_STANDBY_MS_1000);
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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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} |