Library Description

The library covers all the necessary functions to control PHT Click board™. Library performs a standard I2C interface communication.

Key functions:

• (float *pressure ) - Get temperature and pressure function.
• void pht_get_relative_humidity ( float *humidity ) - Get humidity function.
• (uint8_t press_ratio ) - Set Ratio function.

Examples description

The application is composed of three sections :

• System Initialization - Initializes I2C and start to write log.
• Application Initialization - Initialization driver enables - I2C, performs the device reset and determines the oversampling ratio, also write log.
• Application Task - (code snippet) This is an example that demonstrates the use of the PHT Click board™. 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 ( )
{
    pht_get_temperature_pressure( &temperature, &pressure );
    Delay_ms( 10 );
    
    pht_get_relative_humidity( &humidity );
    Delay_ms( 10 );
    
    mikrobus_logWrite( " Pressure    : ", _LOG_TEXT );
    FloatToStr( pressure, log_text );
    mikrobus_logWrite( log_text, _LOG_TEXT );
    mikrobus_logWrite( " mBar", _LOG_LINE );

    FloatToStr( humidity, log_text );
    mikrobus_logWrite( " Humidity    : ", _LOG_TEXT );
    mikrobus_logWrite( log_text, _LOG_TEXT );
    mikrobus_logWrite( " %", _LOG_LINE );
    
    mikrobus_logWrite( " Temperature : ", _LOG_TEXT );
    FloatToStr( temperature, log_text );
    mikrobus_logWrite( log_text, _LOG_TEXT );
    mikrobus_logWrite( " C", _LOG_LINE );
    
    mikrobus_logWrite( "-----------------------------", _LOG_LINE );
    Delay_ms( 3000 );
}

Other mikroE Libraries used in the example:

• I2C
• 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.