no2

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NO 2 Click

NO2 Click is a very accurate nitrogen-dioxide gas sensor Click board™, equipped with the SPEC amperometric gas sensor which electrochemically reacts with the nitrogen-dioxide (NO2).

Click Product page

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Click library

• Author : MikroE Team
• Date : Jan 2020.
• Type : I2C type

Software Support

We provide a library for the No2 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for No2 Click driver.

Standard key functions :

• Config Object Initialization function.

void no2_cfg_setup ( no2_cfg_t *cfg );

• Initialization function.

NO2_RETVAL no2_init ( no2_t *ctx, no2_cfg_t *cfg );

• Click Default Configuration function.

void no2_default_cfg ( no2_t *ctx );

Example key functions :

• Device Enable function

void no2_enable ( no2_t *ctx, uint8_t state );

• Function for read ADC sensor data

uint16_t no2_read_adc ( no2_t *ctx );

• Get NO2 Data function

float no2_get_no_2_ppm ( no2_t *ctx );

Examples Description

This application measures NO2.

The demo application is composed of two sections :

Application Init

Initializes I2C driver and device configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;
    no2_cfg_t cfg;

    /** 
     * 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.

    no2_cfg_setup( &cfg );
    NO2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    no2_init( &no2, &cfg );

    no2_default_cfg( &no2 );

    log_printf( &logger, "NO2 is initialized \r\n" );
    Delay_ms ( 300 );
}
  

Application Task

Gets NO2 (Nitrogen dioxide) data as ppm value and logs to USBUART every 500ms.

void application_task ( void )
{
    float no2_value;

    no2_value = no2_get_no_2_ppm( &no2 );
    log_printf( &logger, "NO2 value : %.2f ppm \r\n", no2_value );
    Delay_ms ( 500 );
} 

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.No2

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.

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