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PHT Click

PHT Click is a compact add-on board that contains a PHT combo sensor. This board features the MS8607, a digital combination sensor providing 3 environmental measurements all-in-one: pressure, humidity, and temperature from TE Connectivity. This sensor is based on leading MEMS technologies, provides factory-calibrated PHT data available over an I2C serial interface.

Click Product page

Click library

  • Author : Stefan Ilic
  • Date : Jul 2021.
  • Type : I2C type

Software Support

We provide a library for the PHT 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 PHT Click driver.

Standard key functions :

  • pht_cfg_setup Config Object Initialization function.
void pht_cfg_setup ( pht_cfg_t *cfg );
  • pht_init Initialization function.
err_t pht_init ( pht_t *ctx, pht_cfg_t *cfg );

Example key functions :

  • pht_set_ratio Set Ratio function.
uint8_t pht_set_ratio ( pht_t *ctx, uint8_t temp_ratio, uint8_t press_ratio );
  • pht_get_temperature_pressure Get temperature and pressure function.
void pht_get_temperature_pressure ( pht_t *ctx, float *temperature, float *pressure );
  • pht_get_relative_humidity Get humidity function.
void pht_get_relative_humidity ( pht_t *ctx, float *humidity );

Example Description

This is an example that demonstrates the use of the PHT Click board.

The demo application is composed of two sections :

Application Init

Initialization driver enables - I2C, performs the device reset and determines the oversampling ratio, also write log.

void application_init ( void ) {
    log_cfg_t log_cfg;  /**< Logger config object. */
    pht_cfg_t pht_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.
    pht_cfg_setup( &pht_cfg );
    PHT_MAP_MIKROBUS( pht_cfg, MIKROBUS_1 );
    err_t init_flag = pht_init( &pht, &pht_cfg );
    if ( I2C_MASTER_ERROR == init_flag ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }
    
    log_printf( &logger, "--------------------------- \r\n " );
    log_printf( &logger, " Device reset \r\n" );
    pht_reset( &pht );
    Delay_ms ( 100 );
    log_printf( &logger, "--------------------------- \r\n " );
    log_printf( &logger, " Set Oversampling Ratio \r\n" );
    pht_set_ratio( &pht, PHT_PT_CMD_RATIO_2048, PHT_PT_CMD_RATIO_2048);
    Delay_ms ( 100 );
    log_printf( &logger, "--------------------------- \r\n " );
    log_info( &logger, " Application Task " );
    log_printf( &logger, "--------------------------- \r\n " );
}

Application Task

PHT Click board can be used to measure Pressure, Temperature and Relative Humidity. All data logs write on USB uart changes every 3 sec.

void application_task ( void ) {
    pht_get_temperature_pressure( &pht, &temperature, &pressure );
    Delay_ms ( 10 );
    pht_get_relative_humidity( &pht, &humidity );
    Delay_ms ( 10 );
    
    log_printf( &logger, " Preassure   : %.2f mbar \r\n ", pressure );
    log_printf( &logger, " Humidity    : %.2f %% \r\n ", humidity );
    log_printf( &logger, " Temperature : %.2f C \r\n ", temperature );
    log_printf( &logger, "--------------------------- \r\n " );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    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.PHT

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.