pressure21  2.1.0.0
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Pressure 21 Click

Pressure 21 Click is a compact add-on board that contains a board-mount pressure sensor. This board features the BMP581, an absolute barometric pressure sensor from Bosch Sensortec. The BMP581 provides a relative accuracy of ±6Pa and typical absolute accuracy of ±30Pa with ultra-low noise, low power consumption, and temperature stability alongside programmable output: temperature-only or both pressure and temperature (pressure-only is not supported). It converts output data into a 24-bit digital value and sends the information via a configurable host interface that supports SPI and I2C serial communications. It measures pressure from 30kPa up to 125kPa over a wide operating temperature range.

Click Product page


Click library

  • Author : Stefan Filipovic
  • Date : Jul 2022.
  • Type : I2C/SPI type

Software Support

We provide a library for the Pressure 21 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Pressure 21 Click driver.

Standard key functions :

Example key functions :

Example Description

This example demonstrates the use of Pressure 21 Click board by reading and displaying the pressure and temperature measurements.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void )
{
log_cfg_t log_cfg;
pressure21_cfg_t pressure21_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
pressure21_cfg_setup( &pressure21_cfg );
PRESSURE21_MAP_MIKROBUS( pressure21_cfg, MIKROBUS_1 );
err_t init_flag = pressure21_init( &pressure21, &pressure21_cfg );
if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( PRESSURE21_ERROR == pressure21_default_cfg ( &pressure21 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}

Application Task

Waits for the data ready interrupt and then reads the pressure and temperature data and displays them on the USB UART approximately once per second.

void application_task ( void )
{
if ( pressure21_get_int_pin ( &pressure21 ) )
{
float pressure, temperature;
if ( PRESSURE21_OK == pressure21_get_sensor_data ( &pressure21, &pressure, &temperature ) )
{
log_printf ( &logger, " Pressure: %.2f mBar\r\n", pressure * PRESSURE21_PA_TO_MBAR );
log_printf ( &logger, " Temperature: %.2f C\r\n\n", temperature );
}
}
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.Pressure21

Additional notes and informations

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. UART terminal is available in all MikroElektronika compilers.


pressure21_default_cfg
err_t pressure21_default_cfg(pressure21_t *ctx)
Pressure 21 default configuration function.
pressure21_init
err_t pressure21_init(pressure21_t *ctx, pressure21_cfg_t *cfg)
Pressure 21 initialization function.
pressure21_cfg_setup
void pressure21_cfg_setup(pressure21_cfg_t *cfg)
Pressure 21 configuration object setup function.
pressure21_cfg_t
Pressure 21 Click configuration object.
Definition: pressure21.h:353
application_task
void application_task(void)
Definition: main.c:66
pressure21_get_sensor_data
err_t pressure21_get_sensor_data(pressure21_t *ctx, float *pressure, float *temperature)
Pressure 21 get sensor data function.
PRESSURE21_ERROR
@ PRESSURE21_ERROR
Definition: pressure21.h:380
application_init
void application_init(void)
Definition: main.c:29
PRESSURE21_PA_TO_MBAR
#define PRESSURE21_PA_TO_MBAR
Definition: pressure21.h:262
PRESSURE21_OK
@ PRESSURE21_OK
Definition: pressure21.h:379
pressure21_s
Pressure 21 Click context object.
Definition: pressure21.h:333
PRESSURE21_MAP_MIKROBUS
#define PRESSURE21_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: pressure21.h:299
pressure21_get_int_pin
uint8_t pressure21_get_int_pin(pressure21_t *ctx)
Pressure 21 get int pin function.
pressure21_write_register
err_t pressure21_write_register(pressure21_t *ctx, uint8_t reg, uint8_t data_in)
Pressure 21 write register function.