Library Description

The library initializes and defines the I2C bus driver.
The library includes the function for reading ADC data and the function for converting ADC value to the percentage of Vacuum and pressure in mBar.
The user also has the function for sensor calibration.

Key functions :

• void vacuum_calibration() - Sensor calibration

• uint16_t vacuum_readData() - The function for reads 12 bit ADC data

• float vacuum_getVoltage() - The function for converting ADC value to pressure data

• float vacuum_getPercentageOfVacuum() - The function for converting ADC value to percentage of Vacuum

Example description

The application is composed of three sections :

• System Initialization - Initializes I2C module
• Application Initialization - Initialization driver init and calibration of the chip to start measuring
• Application Task - (code snippet) - Reads vacuum percentage that sensor reads

void applicationTask()
{
 mikrobus_logWrite("Vacuum (voltage) : ", _LOG_TEXT);
 Vacuum_volt = vacuum_getVoltage();
 FloatToStr(Vacuum_volt, demoText);
 mikrobus_logWrite(demoText, _LOG_TEXT);
 mikrobus_logWrite(" V", _LOG_LINE);

 mikrobus_logWrite("Percentage of vacuum: ", _LOG_TEXT);
 Vacuum = vacuum_getPercentageOfVacuum();
 FloatToStr(Vacuum, demoText);
 mikrobus_logWrite(demoText, _LOG_LINE);

 mikrobus_logWrite(" ", _LOG_LINE);
 Delay_ms(300);
}

Other mikroE Libraries used in the example:

• I2C

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.