Library Description

The library covers all the necessary functions to control LPG Click board. LPG click communicates with the target board via analog ( AN ) pin. This library contains drivers for read ADC value of MQ-5B sensor.

Key functions:

• float lpg_voltageConversion( uint32_t adcValue, float vRef ) - Convert the voltage function.
• float lpg_getRatio( uint32_t adcValue, float vRef ) - Get the sensor ratio function.
• float lpg_getSensorResistance( uint32_t adcValue, float vRef ) - Get the sensor resistance.

Examples description

The application is composed of the three sections :

• System Initialization - Initializes GPIO and LOG structures, sets AN pin as input.
• Application Initialization - Initialization driver enables GPIO and ADC, also starts write log.
• Application Task - (code snippet) This is a example which demonstrates the use of LGP Click board. LGP Click reads ADC value. Results are being sent to the Usart Terminal where you can track their changes. All data logs on usb uart changes for every 1 sec.

void applicationTask()
{      
    valueADC = lgp_readADC(); 
    Delay_100ms(); 
    
    IntToStr( valueADC, logText );
    mikrobus_logWrite( " ADC value: ", _LOG_TEXT );
    mikrobus_logWrite( logText, _LOG_LINE );
    mikrobus_logWrite( "-------------------", _LOG_LINE );
    Delay_1sec();
}

Additional Functions :

• void lgp_adcInit() - Function ADC initialization.
• uint32_t lgp_readADC() - Function read ADC value.

Other mikroE Libraries used in the example:

• ADC
• UART
• Conversions

Additional notes and information

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.