Library Description

The library initializes and defines the I2C bus driver and drivers that offer a choice for writing data in registers and reading data from registers. The library includes functions for full initialization of the chip, reading 3 sensors (CO, NH3 and NO2 data). The user can check the state of the RDY pin indicating if that data is ready for reading.

Key functions:

• void airq5_setConfiguration(uint16_t config) - The functions for configuration.
• uint16_t airq5_readSensorData(uint16_t channel_data) - The functions for reading the sensor data.

Example description

The application is composed of three sections:

• System Initialization -  Initializes I2C module and sets INT pin as INPUT.
• Application Initialization - Initializes driver init and configuration chip.
• Application Task - (code snippet) - Reads the values of CO, NH3 and NO2 sensor and logs data on USBUART every 500ms.

void applicationTask()
{
 NO2_sensorData = airq5_readSensorData(_AIRQ5_DATA_CHANNEL_NO2);
 NH3_sensorData = airq5_readSensorData(_AIRQ5_DATA_CHANNEL_NH3);
 CO_sensorData = airq5_readSensorData(_AIRQ5_DATA_CHANNEL_CO);

 IntToStr(NO2_sensorData, dataText);
 mikrobus_logWrite(" NO2 data: ", _LOG_TEXT);
 mikrobus_logWrite(dataText, _LOG_LINE);

 IntToStr(NH3_sensorData, dataText);
 mikrobus_logWrite(" NH3 data: ", _LOG_TEXT);
 mikrobus_logWrite(dataText, _LOG_LINE);

 IntToStr(CO_sensorData, dataText);
 mikrobus_logWrite(" CO data: ", _LOG_TEXT);
 mikrobus_logWrite(dataText, _LOG_LINE);

 mikrobus_logWrite(" -------- ", _LOG_LINE);
 Delay_ms( 500 );
}

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.