Environment 2 Click

Environment 2 Click is a compact add-on board containing best-in-class SHT humidity and SGP air-quality sensing solutions from Sensirion. This board features SHT40 and SGP40, a high-accuracy ultra-low-power relative humidity, and a temperature sensor combined with MOx based gas sensor. The SHT40 sensor offers linearized digital output, provides constant temperature accuracy, up to 0.1°C, and shows the best performance when operated within the temperature and humidity range of 5-60°C and 20-80%RH, while the SGP40, a digital gas sensor, features a temperature-controlled micro hot-plate providing a humidity-compensated VOC-based indoor air quality signal. This Click board™ is suitable for indoor air quality and various temperature and humidity-related applications

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Feb 2021.
• Type : I2C type

Software Support

We provide a library for the Environment2 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on mikroE github account.

Library Description

This library contains API for Environment2 Click driver.

Standard key functions :

• environment2_cfg_setup Config Object Initialization function.

  void environment2_cfg_setup ( environment2_cfg_t *cfg );

• environment2_init Initialization function.

  ENVIRONMENT2_RETVAL environment2_init ( environment2_t *ctx, environment2_cfg_t *cfg );

• environment2_default_cfg Click Default Configuration function.

  void environment2_default_cfg ( environment2_t *ctx );

Example key functions :

• environment2_get_temp_hum Environment 2 get temperature and relative humidity function.

  err_t environment2_get_temp_hum ( environment2_t *ctx, float *humidity, float *temperature );

• environment2_get_air_quality Environment 2 get air quality data function.

  err_t environment2_get_air_quality ( environment2_t *ctx, uint16_t *air_quality );

• environment2_sgp40_measure_test Environment 2 SGP40 measurement test function.

  uint16_t environment2_sgp40_measure_test ( environment2_t *ctx );

Example Description

This library contains API for Environment 2 Click driver. The library contains drivers for measuring air quality, temperature and relative humidity.

The demo application is composed of two sections :

Application Init

Initializes I2C driver and triggers the built-in self-test checking, set heater off, performs sensors configuration and initialize VOC algorithm.

void application_init ( void ) {
    log_cfg_t log_cfg;                    /**< Logger config object. */
    environment2_cfg_t environment2_cfg;  /**< Click config object. */

    // Logger initialization.

    LOG_MAP_USB_UART( log_cfg );
    log_cfg.level = LOG_LEVEL_DEBUG;
    log_cfg.baud = 115200;
    log_init( &logger, &log_cfg );
    log_printf( &logger, "\r\n    Application Init\r\n" );

    // Click initialization.

    environment2_cfg_setup( &environment2_cfg );
    ENVIRONMENT2_MAP_MIKROBUS( environment2_cfg, MIKROBUS_1 );
    err_t init_flag = environment2_init( &environment2, &environment2_cfg );
    if ( init_flag == I2C_MASTER_ERROR ) {
        log_error( &logger, " Application Init Error. " );
        log_printf( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    log_printf( &logger, "    Application Task   \r\n" );
    log_printf( &logger, "-----------------------\r\n" );
    log_printf( &logger, "  Environment 2 Click  \r\n" );
    log_printf( &logger, "-----------------------\r\n" );

    if ( environment2_sgp40_measure_test( &environment2 ) == ENVIRONMENT2_SGP40_TEST_PASSED ) {
        log_printf( &logger, "    All tests passed\r\n" );
        log_printf( &logger, "      Successfully\r\n" );
    } else {
        log_printf( &logger, "    One or more tests have\r\n" );
        log_printf( &logger, "     Failed\r\n" );
    }
    log_printf( &logger, "-----------------------\r\n" );
    Delay_ms ( 100 );

    environment2_sgp40_heater_off( &environment2 );
    Delay_ms ( 100 );

    environment2_config_sensors( );
    Delay_ms ( 100 );
}

Application Task

This is an example that demonstrates the use of the Environment 2 Click board. Measured and display air quality ( raw data ), temperature ( degrees Celsius ), relative humidity ( % ) and VOC Index. Results are being sent to the Usart Terminal where you can track their changes. All data logs write on USB UART changes every 2 sec.

void application_task ( void ) {
    environment2_get_temp_hum(  &environment2, &humidity, &temperature );
    Delay_ms ( 100 );

    log_printf( &logger, " Humidity    : %.2f %% \r\n", humidity );
    log_printf( &logger, " Temperature : %.2f C \r\n", temperature );

    environment2_get_air_quality( &environment2, &air_quality );
    Delay_ms ( 100 );

    log_printf( &logger, " Air Quality : %d \r\n", air_quality );
    log_printf( &logger, "- - - - - - - - - -  - \r\n" );

    environment2_get_voc_index( &environment2, &voc_index );
    Delay_ms ( 100 );

    log_printf( &logger, " VOC Index   : %d  \r\n", ( uint16_t ) voc_index );
    log_printf( &logger, "-----------------------\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on mikroE github account.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Environment2

Additional notes and informations

Depending on the development board you are using, you may need USB UART Click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all Mikroelektronika compilers.