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mikroSDK Library

Environment click

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Author: MikroElektronika Team

Last Updated: 2019-05-29

Category: Measurement

Downloaded: 859 times

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License: MIT license  

Environment click measures temperature, relative humidity, pressure and VOC (Volatile Organic Compounds gases). The click carries the BME680 environmental sensor from Bosch. Environment click is designed to run on a 3.3V power supply. It communicates with the target microcontroller over SPI or I2C interface.

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mikroSDK Library Blog

Front/Back View

Front/Back View

Front and back view of the Environment click.

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Library Description

The library covers all the necessary functions to control Environment Click board. Library performs the communication with the device via I2C or SPI driver by writing to registers and by reading from registers. The library has generic write and reads function, get ambient data function, get temperature, humidity, pressure and gas resistance data from the register, function for reading factory calibration, for sets default configuration, etc.

Key functions:

  • float environment_getAmbientData( uint8_t dataIn ) - Get ambient data function.
  • void environment_defaultConfig() - Set default configuration function.
  • void environment_getCalibrationData() - Get calibration parameters function.

Examples description

The application is composed of the three sections :

  • System Initialization - Initializes GPIO, I2C or SPI and LOG structures, set CS pin as output and start to write log.
  • Application Initialization - Initialization driver enables - I2C or SPI, device software reset, check device ID, set default configuration of BME680 chip, also display logs.
  • Application Task - This is an example which demonstrates the use of Environment Click board. Measured temperature, humidity, pressure and gas resistance data from the BME680 chip sensor. Display ambient temperature data to degrees Celsius [ °C ], humidity data [ % ], pressure data [ mbar ] and gas resistance. Results are being sent to the Usart Terminal where you can track their changes. All data logs write on usb uart changes for every 2 sec.
void applicationTask()
{
    temperature = environment_getTemperature();
    Delay_10ms();
    mikrobus_logWrite( " Temperature    : ", _LOG_TEXT );
    FloatToStr( temperature, logText );
    mikrobus_logWrite( logText, _LOG_TEXT );
    mikrobus_logWrite( degCel, _LOG_LINE );

    humidity = environment_getHumidity();
    Delay_10ms();
    mikrobus_logWrite( " Humidity       : ", _LOG_TEXT );
    FloatToStr( humidity, logText );
    mikrobus_logWrite( logText, _LOG_TEXT );
    mikrobus_logWrite( " %", _LOG_LINE );

    pressure = environment_getPressure();
    Delay_10ms();
    mikrobus_logWrite( " Pressure       : ", _LOG_TEXT );
    FloatToStr( pressure, logText );
    mikrobus_logWrite( logText, _LOG_TEXT );
    mikrobus_logWrite( " mbar", _LOG_LINE );

    gas = environment_getGasResistance();
    Delay_10ms();
    mikrobus_logWrite( " Gas Resistance : ", _LOG_TEXT );
    LongWordToStr( gas, logText );
    ltrim( logText );
    mikrobus_logWrite( logText, _LOG_LINE );
    mikrobus_logWrite( "--------------------------------", _LOG_LINE );

    Delay_1sec();
    Delay_1sec();
}

Other mikroE Libraries used in the example:

  • SPI or I2C
  • UART
  • Conversions

Additional notes and informations

Depending on the development board you are using, you may need USB UART clickUSB 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.

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