Library Description

The library covers all the necessary functions that enables the usage of the Hydro Probe click board. It offers reading from output register, calulation for average value from 100 raw reads,functions for maximum and mimimum values from 100 raw reads and calculations that result in environment moisture content in percents.

Key functions:

• uint8_t hydroprobe_rel_env_hum ( uint16_t dry_val, uint16_t wet_val ); - Function is used to get environment moisture content in percents.
• uint16_t hydroprobe_min_val ( ); - Function is used to read minimum value from 100 raw reads.
• uint16_t hydroprobe_max_val ( ); - Function is used to read maximum value from 100 raw reads.

Examples description

The application is composed of three sections :

• System Initialization - Initializes I2C module and LOG structure.
• Application Initialization - Initalizes I2C driver, prerforms calibration and makes an initial log.
• Application Task - (code snippet) This example shows the capabilities of the Hydro Probe click by measuring environment moisture content and displaying it in percent via USART terminal.

void application_task ( )
{
    humy_val = hydroprobe_rel_env_hum( dry_val, wet_val );
    WordToStr( humy_val, log_txt );
    mikrobus_logWrite( "Environment moisture content: ", _LOG_TEXT );
    Ltrim( log_txt );
    mikrobus_logWrite( log_txt, _LOG_TEXT );
    mikrobus_logWrite( "%", _LOG_LINE );
    mikrobus_logWrite( "------------------------------", _LOG_LINE );
    Delay_ms( 1000 );
}

Additional Functions :

• void hydroprobe_calib ( ) - Function is used to calibrate measurement.

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.