ph2  2.1.0.0
Main Page

pH 2 click

pH 2 Click is a compact add-on board used to determine the alkalinity or acidity of a sample. This board features the MCP607, a low-bias current Op Amp from Microchip, performing level shifting and high-input impedance buffering in a single-supply pH-electrode circuit.

click Product page


Click library

  • Author : Stefan Ilic
  • Date : Jan 2023.
  • Type : ADC/I2C type

Software Support

We provide a library for the pH 2 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 2 Click driver.

Standard key functions :

Example key functions :

Example Description

This library contains API for pH 2 Click driver.

The library initializes and defines the I2C bus drivers or ADC drivers to read data from pH probe.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs offset calibration,

as well as calibration in pH-neutral substance.

void application_init ( void )
{
log_cfg_t log_cfg;
ph2_cfg_t ph2_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
ph2_cfg_setup( &ph2_cfg );
PH2_MAP_MIKROBUS( ph2_cfg, MIKROBUS_1 );
err_t init_flag = ph2_init( &ph2, &ph2_cfg );
if ( ( ADC_ERROR == init_flag ) || ( I2C_MASTER_ERROR == init_flag ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
log_printf( &logger, " ================================ \r\n" );
log_printf( &logger, " Performing calibration \r\n" );
log_printf( &logger, " ================================ \r\n" );
log_printf( &logger, " Disconect BNC connector, \r\n" );
log_printf( &logger, " short-circuit it, \r\n" );
log_printf( &logger, " adjust offset potentiometer \r\n" );
log_printf( &logger, " ================================ \r\n" );
log_printf( &logger, " STAT1 - turn clockwise \r\n" );
log_printf( &logger, " STAT2 - turn counter-clockwise \r\n" );
log_printf( &logger, " ================================ \r\n" );
log_printf( &logger, " Calibration completed \r\n" );
log_printf( &logger, " ================================ \r\n" );
log_printf( &logger, " Connect probe back \r\n" );
log_printf( &logger, " ================================ \r\n" );
Delay_ms( 5000 );
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" );
Delay_ms( 5000 );
log_printf( &logger, " Starting calibration \r\n" );
log_printf( &logger, " ================================ \r\n" );
ph2_calibrate( &ph2, 7 );
log_printf( &logger, " Calibration done! \r\n" );
log_printf( &logger, " ================================ \r\n" );
log_info( &logger, " Application Task " );
log_printf( &logger, " ================================ \r\n" );
}

Application Task

This example demonstrates the use of the pH 2 Click board by

reading pH value of the substance where probe is placed.

void application_task ( void )
{
float pH_val = 0;
ph2_calculate_ph( &ph2, &pH_val );
log_printf( &logger, " pH value: %.3f \r\n", pH_val );
log_printf( &logger, " ================================ \r\n" );
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.pH2

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.


ph2_t
pH 2 Click context object.
Definition: ph2.h:188
ph2_cfg_setup
void ph2_cfg_setup(ph2_cfg_t *cfg)
pH 2 configuration object setup function.
ph2_calibrate
err_t ph2_calibrate(ph2_t *ctx, float pH_value)
Ph 2 calibrate function.
application_task
void application_task(void)
Definition: main.c:96
ph2_calculate_ph
err_t ph2_calculate_ph(ph2_t *ctx, float *pH_value)
Ph 2 calculate pH value function.
ph2_cfg_t
pH 2 Click configuration object.
Definition: ph2.h:212
PH2_MAP_MIKROBUS
#define PH2_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: ph2.h:161
ph2_init
err_t ph2_init(ph2_t *ctx, ph2_cfg_t *cfg)
pH 2 initialization function.
application_init
void application_init(void)
Definition: main.c:32
ph2_calibrate_offset
void ph2_calibrate_offset(ph2_t *ctx)
Ph 2 calibrate offset function.