vavpress  2.0.0.0
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VAV Press click

VAV Press Click is a compact add-on board that contains a board-mount pressure sensor. This board features the LMIS025B, a low differential pressure sensor from First Sensor (part of TE Connectivity). It is based on thermal flow measurement of gas through a micro-flow channel integrated within the sensor chip. The innovative LMI technology features superior sensitivity, especially for ultra-low pressures ranging from 0 to 25Pa. The extremely low gas flow through the sensor ensures high immunity to dust contamination, humidity, and long tubing compared to other flow-based pressure sensors.

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Click library

  • Author : Nenad Filipovic
  • Date : Mar 2021.
  • Type : I2C type

Software Support

We provide a library for the VavPress 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 VavPress Click driver.

Standard key functions :

Example key functions :

Example Description

This library contains API for the Vav Press click driver. This demo application shows an example of differential pressure and temperature measurement.

The demo application is composed of two sections :

Application Init

Initialization of I2C module and log UART. After driver initialization and default settings, the app display retrieve the electronic signature and set the sensor parameters data.

void application_init ( void ) {
log_cfg_t log_cfg;
vavpress_cfg_t vavpress_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_printf( &logger, "\r\n" );
log_info( &logger, " Application Init " );
// Click initialization.
vavpress_cfg_setup( &vavpress_cfg );
VAVPRESS_MAP_MIKROBUS( vavpress_cfg, MIKROBUS_1 );
err_t init_flag = vavpress_init( &vavpress, &vavpress_cfg );
if ( init_flag == I2C_MASTER_ERROR ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
vavpress_default_cfg ( &vavpress );
log_info( &logger, " Application Task " );
Delay_ms( 100 );
Delay_ms( 100 );
log_printf( &logger, "--------------------------------\r\n" );
log_printf( &logger, " Firmware Version : %.3f \r\n", el_signature_data.firmware_version );
log_printf( &logger, " Pressure Range : %d Pa \r\n", el_signature_data.pressure_range );
log_printf( &logger, " Part # : %.11s \r\n", el_signature_data.part_number );
log_printf( &logger, " Lot # : %.7s \r\n", el_signature_data.lot_number );
log_printf( &logger, " Output Type : %c \r\n", el_signature_data.output_type );
log_printf( &logger, " Scale Factor : %d \r\n", el_signature_data.scale_factor );
log_printf( &logger, " Calibration ID : %.2s \r\n", el_signature_data.calibration_id );
log_printf( &logger, " Week number : %d \r\n", el_signature_data.week_number );
log_printf( &logger, " Year number : %d \r\n", el_signature_data.year_number );
log_printf( &logger, " Sequence number : %d \r\n", el_signature_data.sequence_number );
log_printf( &logger, "--------------------------------\r\n" );
Delay_ms( 2000 );
Delay_ms( 100 );
}

Application Task

This is an example that shows the use of a Vav Press click boardâ„¢. Logs pressure difference value [ Pa ] and temperature [ degree Celsius ] value. Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( void ) {
err_t error_flag = vavpress_get_dif_press_and_temp( &vavpress, &param_data, &diff_press, &temperature );
if ( error_flag == VAVPRESS_OK ) {
log_printf( &logger, " Diff. Pressure : %.4f Pa\r\n", diff_press );
log_printf( &logger, " Temperature : %.4f C\r\n", temperature );
log_printf( &logger, "--------------------------------\r\n" );
Delay_ms( 2000 );
} else {
log_error( &logger, " Communcation Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
}

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.VavPress

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.


vavpress_el_signature_data_t::lot_number
char lot_number[7]
Definition: vavpress.h:144
vavpress_init
err_t vavpress_init(vavpress_t *ctx, vavpress_cfg_t *cfg)
VAV Press initialization function.
vavpress_default_cfg
err_t vavpress_default_cfg(vavpress_t *ctx)
VAV Press default configuration function.
vavpress_el_signature_data_t::scale_factor
uint16_t scale_factor
Definition: vavpress.h:147
vavpress_set_default_sensor_param
err_t vavpress_set_default_sensor_param(vavpress_t *ctx, vavpress_sensor_param_data_t *param_data)
VAV Press set default sensor parameter function.
vavpress_cfg_t
VAV Press Click configuration object.
Definition: vavpress.h:115
vavpress_sensor_param_data_t::scale_factor_press
uint16_t scale_factor_press
Definition: vavpress.h:162
vavpress_el_signature_data_t::calibration_id
char calibration_id[2]
Definition: vavpress.h:148
application_task
void application_task(void)
Definition: main.c:97
vavpress_t
VAV Press Click context object.
Definition: vavpress.h:99
vavpress_sensor_param_data_t::scale_factor_temp
uint16_t scale_factor_temp
Definition: vavpress.h:161
vavpress_cfg_setup
void vavpress_cfg_setup(vavpress_cfg_t *cfg)
VAV Press configuration object setup function.
vavpress_el_signature_data_t::sequence_number
uint16_t sequence_number
Definition: vavpress.h:151
vavpress_sensor_param_data_t::readout_at_known_temperature
uint16_t readout_at_known_temperature
Definition: vavpress.h:163
VAVPRESS_OK
Definition: vavpress.h:131
param_data
vavpress_sensor_param_data_t param_data
Definition: main.c:37
vavpress_sensor_param_data_t::known_temperature_c
float known_temperature_c
Definition: vavpress.h:164
vavpress_el_signature_data_t::pressure_range
uint16_t pressure_range
Definition: vavpress.h:145
el_signature_data
vavpress_el_signature_data_t el_signature_data
Definition: main.c:36
vavpress_el_signature_data_t::part_number
char part_number[12]
Definition: vavpress.h:143
vavpress_sensor_param_data_t
VAV Press Click sensor parameter data.
Definition: vavpress.h:159
application_init
void application_init(void)
Definition: main.c:39
VAVPRESS_MAP_MIKROBUS
#define VAVPRESS_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: vavpress.h:88
vavpress_el_signature_data_t::output_type
char output_type
Definition: vavpress.h:146
vavpress_retrieve_electronic_signature
err_t vavpress_retrieve_electronic_signature(vavpress_t *ctx, vavpress_el_signature_data_t *el_signature_data)
VAV Press retrieve electronic signature function.
vavpress_get_dif_press_and_temp
err_t vavpress_get_dif_press_and_temp(vavpress_t *ctx, vavpress_sensor_param_data_t *param_data, float *diff_press, float *temperature)
VAV Press get differential pressure and temperature function.
vavpress_el_signature_data_t::year_number
uint8_t year_number
Definition: vavpress.h:150
vavpress_el_signature_data_t::firmware_version
float firmware_version
Definition: vavpress.h:142
vavpress_el_signature_data_t::week_number
uint8_t week_number
Definition: vavpress.h:149
vavpress_el_signature_data_t
VAV Press Click electronic signature.
Definition: vavpress.h:140