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75 lines
2.2 KiB
C
75 lines
2.2 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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Adopted from i2c - Simple example
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Simple I2C example that shows how to initialize I2C
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as well as reading and writing from and to registers for a sensor connected over I2C.
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The sensor used in this example is a MPU9250 inertial measurement unit.
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For other examples please check:
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https://github.com/espressif/esp-idf/tree/master/examples
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See README.md file to get detailed usage of this example.
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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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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static const char *TAG = "i2c-simple-example";
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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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static i2c_bus_handle_t i2c_bus = NULL;
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static bme280_handle_t bme280 = NULL;
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i2c_config_t conf = {
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.mode = I2C_MODE_MASTER,
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.sda_io_num = 21,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_io_num = 22,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.master.clk_speed = 100000,
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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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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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bme280_default_init(bme280);
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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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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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//printf("Temperature: %.1f C\n", temperature);
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//printf("Humidity: %.2f %%\n", humidity);
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//printf("Pressure: %.2f kPa\n", pressure);
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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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} |