k0i05/esp_pressure_tendency

readme

# ESP-IDF Pressure Tendency

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This ESP32 espressif IoT development framework (esp-idf) pressure tendency component observes the last 3-hours of atmospheric pressure samples to determine if pressure is steady, rising, or falling.  Information on features and functionality are documented and can be found in the `pressure_tendency.h` header file.

## Repository

The component is hosted on github and is located here: <https://github.com/K0I05/ESP32-S3_ESP-IDF_COMPONENTS/tree/main/components/utilities/esp_pressure_tendency>

## General Usage

To get started, simply copy the component to your project's `components` folder and reference the `pressure_tendency.h` header file as an include.  The component includes documentation for the peripheral such as the datasheet, application notes, and/or user manual where applicable.

```text
components
└── esp_pressure_tendency
    ├── CMakeLists.txt
    ├── README.md
    ├── LICENSE
    ├── idf_component.yml
    ├── library.json
    ├── include
    │   └── pressure_tendency_version.h
    │   └── pressure_tendency.h
    └── pressure_tendency.c
```

## Basic Example

Once the component is referenced as an include, the functions should be visible and available for usage.  The below example demonstrates a basic implementation that monitors atmospheric pressure samples and determines if pressure is steady, rising, or falling.  Pressure tendency code `PRESSURE_TENDENCY_UNKNOWN` is reported when there is an insufficient number of samples to analyze.

```c
#include <pressure_tendency.h>

/* pa tendency handle and configuration */
const uint16_t              tendency_samples_size = ((3600 * 3) / tii_sampling_cfg.interval_period); // 3-hours = 10,800-seconds / sampling rate
pressure_tendency_handle_t  pa_tendency_hdl;
pressure_tendency_codes_t   pa_tendency_code;
float                       pa;
float                       pa_3chg;

void tendency(void) {
    /* attempt to initialize a pa tendency handle */
    pressure_tendency_init(tendency_samples_size, &pa_tendency_hdl);
    if (pa_tendency_hdl == NULL) {
        ESP_LOGE(TAG, "Unable to initialize pa tendency handle");
        esp_restart(); 
    }

    /* attempt to measure atmospheric pressure sensor */
    pa = measure.pa();

    pressure_tendency_analysis(pa_tendency_hdl, pa, &pa_tendency_code, &pa_3chg);

    ESP_LOGI(TAG, "Pressure Tendency:    %s", pressure_tendency_code_to_string(pa_tendency_code));
    ESP_LOGI(TAG, "3-hr Pressure Change: %.2f hPa", pa_3chg);
}
```

Copyright (c) 2024 Eric Gionet (<gionet.c.eric@gmail.com>)