Library Description

Library initializes and defines I2C driver and performs writing to registers and reading from registers. Also has the ability to measure CO2 concentration in ppm unit. For more details check the documentation.

Key functions:

• uint8_t ndirco2_writeReg( uint8_t register_address, uint8_t transfer_data ) - Function writes one byte data to register.
• uint8_t ndirco2_readReg( uint8_t register_address, uint16_t *dataOut ) - Function reads data from register.
• void ndirco2_readCO2( uint8_t setCheckMode, uint16_t *outputData ) - Function reads 15-bit CO2 concentration data from data registers only when data is ready for reading after each measurement or after number of measurements determined by AVE register + 1.

Example description

The application is composed of three sections:

• System Initialization -  Initializes peripherals and pins.
• Application Initialization - Initializes I2C driver and performs driver reset and determines
  a number of averaging measurements.
• Application Task - (code snippet) - Reads CO2 concentration data in ppm unit after each completed measurement. One measurement is finished after 300 ms, and the period between two measurements is 2 seconds. Results of measurements logs on USBUART.

void applicationTask()
{
 ndirco2_readCO2( _NDIRCO2_CHECK_EACH_MEASURE, &co2Data );
 WordToStr( co2Data, text );
 mikrobus_logWrite( "CO2 concentration is: ", _LOG_TEXT );
 mikrobus_logWrite( text, _LOG_TEXT );
 mikrobus_logWrite( "ppm", _LOG_LINE );
}

Other MikroElektronika libraries used in the example:

• Conversions
• I2C
• UART

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.