co_2

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CO 2 Click

CO 2 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : MikroE Team
• Date : Dec 2019.
• Type : I2C type

Software Support

Example Description

This application enables usage of very accurate CO sensor.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.CO2

Example Key Functions

• co2_cfg_setup Config Object Initialization function.

void co2_cfg_setup ( co2_cfg_t *cfg );

• co2_init Initialization function.

err_t co2_init ( co2_t *ctx, co2_cfg_t *cfg );

• co2_read_adc Function reads the converted data (CO) from the 12-bit AD converter.

void co2_read_adc ( co2_t *ctx, uint16_t *data_out );

• co2_enable Function puts the device to enabled or to disabled state.

void co2_enable ( co2_t *ctx, uint8_t state );

• co2_get_co2_ppm Function reads the CO converted data and calculates this value to the ppm.

 co2_get_co2_ppm ( co2_t *ctx, float *co2_data );

Application Init

Initializes I2C interface and performs the device configuration for properly working.

void application_init ( void )
{
    log_cfg_t log_cfg;
    co2_cfg_t cfg;
    uint8_t temp_w;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    co2_cfg_setup( &cfg );
    CO2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    co2_init( &co2, &cfg );

    Delay_ms ( 500 );
    
    temp_w = CO2_WRITE_MODE;
    co2_generic_write( &co2, CO2_LOCK_REG, &temp_w, 1 );
    temp_w = CO2_STANDBY_MODE;
    co2_generic_write( &co2, CO2_MODECN_REG, &temp_w, 1 );
    temp_w = CO2_3500_OHM_TIA_RES | CO2_100_OHM_LOAD_RES;
    co2_generic_write( &co2, CO2_TIACN_REG, &temp_w, 1 );
    temp_w = CO2_VREF_EXT | CO2_50_PERCENTS_INT_ZERO | CO2_BIAS_POL_NEGATIVE | CO2_0_PERCENTS_BIAS;
    co2_generic_write( &co2, CO2_REFCN_REG, &temp_w, 1 );
    
    log_printf( &logger, "CO 2 is initialized\r\n\r\n" );
    Delay_ms ( 1000 );
}

Application Task

Gets CO (Carbon Monoxide) data as ppm value every 300 miliseconds. Results will be logged on UART. The CO value range is from 0 to 1000 ppm.

void application_task ( void )
{
    float co2_value;
   
    co2_wait_i2c_ready( &co2 );
    co2_get_co2_ppm( &co2, &co2_value );
    
    log_printf( &logger, "CO : %.2f ppm\r\n", co2_value );
    Delay_ms ( 300 );
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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