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mikroSDK Library

Weather click

Rating:

2

Author: MikroElektronika Team

Last Updated: 2019-03-20

Category: Measurement

Downloaded: 1834 times

Followed by: 3 users

Weather click carries the BME280 integrated environmental unit from Bosch. It’s a sensor that detects humidity, pressure and temperature.Weather click can communicate with the target MCU either through mikroBUS SPI or I2C interfaces. The board is designed to use a 3.3V power supply.

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mikroSDK Library Blog

Weather Click board

Weather Click board

Front and back side appearance of the Weather click Board.

View full image

Library Description

The library covers all the necessary functions to control Weather 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 measurements function, get temperature, humidity and pressure data from the register, the function for reading factory calibration, for sets configuration, etc. Function who gets temperature, humidity and pressure also read factory calibration and converts temperature data to degree Celsius [ °C ], humidity value to a percentage [ % ] and pressure value to mbar.

Key functions:

  • void weather_softReset() - Soft reset function.
  • uint8_t weather_getConfig() - Get configuration function.
  • void weather_getWeather( float *temperature, float *humidity, float *pressure ) - Get weather ( temperature, humidity and pressure ) data function.

Examples description

The application is composed of three sections:

  • System Initialization - Initializes GPIO, I2C or SPI and LOG structures, set CS pin as output.
  • Application Initialization -  Initialization driver enables - I2C, set default configuration and start to write log.
  • Application Task - (code snippet) This is an example which demonstrates the use of Weather Click board. Measured temperature, humidity pressure data from the BME280 chip sensor. Display converted temperature data to degrees Celsius [ °C ], humidity data to percentage [ % ] and pressure data [ mbar ]. Results are being sent to the Usart Terminal where you can track their changes. All data logs write on usb uart changes for every 3 sec.
void applicationTask() 
{
    weather_getWeather( &temperature, &humidity, &pressure );
    
    FloatToStr( temperature, logText );
    mikrobus_logWrite( " Temperature : ", _LOG_TEXT );
    mikrobus_logWrite( logText, _LOG_TEXT );
    mikrobus_logWrite( degCel, _LOG_LINE );

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

    FloatToStr( pressure, logText );
    mikrobus_logWrite( " Pressure    : ", _LOG_TEXT );
    mikrobus_logWrite( logText, _LOG_TEXT );
    mikrobus_logWrite( " mbar", _LOG_LINE );
    
    mikrobus_logWrite( "-----------------------------", _LOG_LINE );
    Delay_ms( 3000 );
}      

Other mikroE Libraries used in the example:

  • SPI or I2C
  • UART​
  • Conversion

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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