pH Click

pH Click is a compact add-on board that provides an opportunity for the user to read pH with the same accuracy and capabilities as with some other expensive solutions. This board features the pH EZO™, a 6th generation embedded pH circuit that offers the highest level of stability and accuracy from AtlasScientific.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Oct 2021.
• Type : UART type

Software Support

We provide a library for the pH 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 pH Click driver.

Standard key functions :

• ph_cfg_setup Config Object Initialization function.

  void ph_cfg_setup ( ph_cfg_t *cfg );

• ph_init Initialization function.

  err_t ph_init ( ph_t *ctx, ph_cfg_t *cfg );

• ph_default_cfg Click Default Configuration function.

  err_t ph_default_cfg ( ph_t *ctx );

Example key functions :

• ph_send_cmd Send command function.

  void ph_send_cmd ( ph_t *ctx, char *p_cmd );

• ph_get_cmd_resp Send get response function.

  void ph_get_cmd_resp ( ph_t *ctx, char *p_cmd, char *p_resp );

• ph_switch_led Toggle LED function.

  void ph_switch_led ( ph_t *ctx, uint8_t state, char *p_resp );

Example Description

This example reads and processes data from pH clicks.

The demo application is composed of two sections :

Application Init

Initializes UART driver, performing a factory reset of the device, disabling continuous read, and performing calibration at the midpoint on the pH scale.

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

    /** 
     * 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.
    ph_cfg_setup( &ph_cfg );
    PH_MAP_MIKROBUS( ph_cfg, MIKROBUS_1 );
    if ( UART_ERROR == ph_init( &ph, &ph_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    ph_factory_rst( &ph, app_buf );
    Delay_ms ( 1000 );

    ph_cont_read( &ph, 0, app_buf );
    log_printf( &logger, "-----------------------\r\n" );
    log_printf( &logger, "   -- Initialized --   \r\n" );
    log_printf( &logger, "-----------------------\r\n" );
    log_printf( &logger, "  Place probe into pH  \r\n" );
    log_printf( &logger, " neutral substance for \r\n" );
    log_printf( &logger, " mid point calibration \r\n" );
    log_printf( &logger, "-----------------------\r\n" );
    for ( uint8_t n_cnt = 0; n_cnt < 20; n_cnt++ )
    {
        Delay_ms ( 1000 );
    }
    log_printf( &logger, " Starting calibration  \r\n" );
    log_printf( &logger, "-----------------------\r\n" );
    ph_perf_calib ( &ph, PH_CMD_CALIB_MID, 7.000, app_buf );
    Delay_ms ( 1000 );
    log_printf( &logger, " Calibration done!     \r\n" );
    log_printf( &logger, "-----------------------\r\n" );

    log_printf( &logger, " - Application  task -\r\n" );
    log_printf( &logger, "-----------------------\r\n" );
    ph_send_cmd( &ph, PH_CMD_DIS_RSP_CODES );
    Delay_ms ( 1000 );
    ph_clr_log_buf( app_buf );
}

Application Task

This example shows the capabilities of the pH Click board by performing a reading of the pH value of the substance in which the probe is submerged and displaying readings via the USART terminal.

void application_task ( void ) 
{
    ph_send_cmd ( &ph, PH_CMD_SET_SNGL_READ );
    ph_response( &ph, app_buf );
    log_printf( &logger, " pH value: %s ", app_buf );
    log_printf( &logger, "-----------------------\r\n" );
    ph_clr_log_buf( app_buf );
    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.pH

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.