k0i05/esp_mlx90614

readme

# Melexis MLX90614 Sensor

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This ESP32 espressif IoT development framework (esp-idf) i2c peripheral driver was developed for the Melexis MLX90614 single and dual-zone infrared thermometer sensor.  Information on features and functionality are documented and can be found in the `mlx90614.h` header file and in the `documentation` folder.

## Repository

The component is hosted on github and is located here: <https://github.com/K0I05/ESP32-S3_ESP-IDF_COMPONENTS/tree/main/components/peripherals/i2c/esp_mlx90614>

## General Usage

To get started, simply copy the component to your project's `components` folder and reference the `mlx90614.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_mlx90614
    ├── CMakeLists.txt
    ├── README.md
    ├── LICENSE
    ├── idf_component.yml
    ├── library.json
    ├── documentation
    │   └── datasheets, etc.
    ├── include
    │   └── mlx90614_version.h
    │   └── mlx90614.h
    └── mlx90614.c
```

## Basic Example

Once a driver instance is instantiated the sensor is ready for usage as shown in the below example.   This basic implementation of the driver utilizes default configuration settings and makes a measurement request from the sensor at user defined interval and prints the results.

```c
#include <mlx90614.h>

void i2c0_mlx90614_task( void *pvParameters ) {
    // initialize the xLastWakeTime variable with the current time.
    TickType_t         last_wake_time   = xTaskGetTickCount ();
    //
    // initialize i2c device configuration
    mlx90614_config_t dev_cfg       = I2C_MLX90614_CONFIG_DEFAULT;
    mlx90614_handle_t dev_hdl;
    //
    // init device
    mlx90614_init(i2c0_bus_hdl, &dev_cfg, &dev_hdl);
    if (dev_hdl == NULL) {
        ESP_LOGE(APP_TAG, "mlx90614 handle init failed");
        assert(dev_hdl);
    }
    
    // task loop entry point
    for ( ;; ) {
        ESP_LOGI(APP_TAG, "######################## MLX90614 - START #########################");
        //
        // handle sensor
        float temperature, obj1_temperature, obj2_temperature;
        esp_err_t result = mlx90614_get_temperatures(dev_hdl, &temperature, &obj1_temperature, &obj2_temperature);
        if(result != ESP_OK) {
            ESP_LOGE(APP_TAG, "mlx90614 device read failed (%s)", esp_err_to_name(result));
        } else {
            ESP_LOGI(APP_TAG, "air temperature:      %.2f C", temperature);
            ESP_LOGI(APP_TAG, "object 1 temperature: %.2f C", obj1_temperature);
            ESP_LOGI(APP_TAG, "object 2 temperature: %.2f C", obj2_temperature);
        }
        //
        ESP_LOGI(APP_TAG, "######################## MLX90614 - END ###########################");
        //
        //
        // pause the task per defined wait period
        vTaskDelaySecUntil( &last_wake_time, I2C0_TASK_SAMPLING_RATE );
    }
    //
    // free resources
    mlx90614_delete( dev_hdl );
    vTaskDelete( NULL );
}
```

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