Library Description

The library covers all the functions necessary to control pH Click board™. It initializes and defines the UART drivers, and holds functions that allow full control of the device to the user.

Key functions:

• void ph_send_cmd ( char *p_cmd ); - Function is used to send command and does not expect response.
• void ph_perf_calib ( char *point, float flt_val, char *p_resp ); - Function is used to perform calibration.
• ph_response ( char *p_resp ); - Function is used to handle collected data.

Examples description

The application is composed of three sections :

• System Initialization - Initializes UART module and LOG structure.
• Application Initialization - Initalizes UART driver, sets up driver up the device, and performs a single point calibration.
• Application Task - This example shows capabilities of pH Click board™ by reading user's perform single read input from USART terminal and performs reading of pH value of the supstance in which the probe is submerged and displaying readings via USART terminal.

void application_task ( )
{
    char cmd;

    ph_clr_log_buf( &log_txt[ 0 ] );
    if ( UART_Rdy_Ptr() )
    {
        cmd = UART_Rd_Ptr( );
        mikrobus_logWrite( "", _LOG_LINE );
        mikrobus_logWrite( " pH value: ", _LOG_TEXT );
        ph_send_cmd ( PH_CMD_SET_SNGL_READ );
        Delay_ms( 1000 );
        ph_response( &log_txt[ 0 ] );
        mikrobus_logWrite( &log_txt[ 0 ], _LOG_LINE );
    }
}

Additional Functions :

• void float_to_str ( uint8_t byte_buf, uint8_t *str ) - Wrapper FloatToStr for driver function.
• void long_word_to_str ( uint32_t long_word_buf, uint8_t *str ) - Wrapper LongWordToStr for driver function.
• void byte_to_str ( uint8_t byte_buf, uint8_t *str ) - Wrapper ByteToStr for driver function.

Other mikroE Libraries used in the example:

• UART
• Conversions

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.