Explore the significance of barometers as essential instruments in scientific research and experimentation
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Hardware Overview
How does it work?
Barometer 7 Click is based on the KP264XTMA1, a high-accuracy digital barometric air pressure sensor from Infineon Technologies, to measure air pressure in a specific environment. The sensor is individually calibrated and temperature compensated, reducing software complexity by directly reading pressure and temperature. The KP264XTMA1 provides a fast startup time of less than 10ms measures pressure from 40kPa up to 115kPa with an accuracy of ±1.5kPa, ideally suited to the harsh environmental conditions prevalent in industrial and consumer applications. This Click
board™ communicates with MCU through a standard SPI interface that enables high clock speeds up to 5MHz. The KP264XTMA1 converts pressure into a 10-bit digital value and sends the information via the SPI interface. In addition, a temperature sensor is also integrated into this chip. Based on the received SPI command, the 10-bit temperature information will also be transmitted via the SPI interface. The KP264XTMA1 is fully calibrated and has a linear transfer function between the applied pressure and the digital output signal. Its unique reliability feature is the
integrated diagnostic mode, which tests the sensor cells and the signal path, triggered with an SPI command. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.
Features overview
Development board
Arduino UNO is a versatile microcontroller board built around the ATmega328P chip. It offers extensive connectivity options for various projects, featuring 14 digital input/output pins, six of which are PWM-capable, along with six analog inputs. Its core components include a 16MHz ceramic resonator, a USB connection, a power jack, an
ICSP header, and a reset button, providing everything necessary to power and program the board. The Uno is ready to go, whether connected to a computer via USB or powered by an AC-to-DC adapter or battery. As the first USB Arduino board, it serves as the benchmark for the Arduino platform, with "Uno" symbolizing its status as the
first in a series. This name choice, meaning "one" in Italian, commemorates the launch of Arduino Software (IDE) 1.0. Initially introduced alongside version 1.0 of the Arduino Software (IDE), the Uno has since become the foundational model for subsequent Arduino releases, embodying the platform's evolution.
Microcontroller Overview
MCU Card / MCU

Architecture
AVR
MCU Memory (KB)
32
Silicon Vendor
Microchip
Pin count
28
RAM (Bytes)
2048
You complete me!
Accessories
Click Shield for Arduino UNO has two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the Arduino UNO board without effort. The Arduino Uno, a microcontroller board based on the ATmega328P, provides an affordable and flexible way for users to try out new concepts and build prototypes with the ATmega328P microcontroller from various combinations of performance, power consumption, and features. The Arduino Uno has 14 digital input/output pins (of which six can be used as PWM outputs), six analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header, and reset button. Most of the ATmega328P microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the Arduino UNO board with our Click Shield for Arduino UNO, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic

Step by step
Project assembly
Track your results in real time
Application Output
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.

2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.

3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.

Software Support
Library Description
This library contains API for Barometer 7 Click driver.
Key functions:
barometer7_get_pressure
- Barometer 7 get pressure functionbarometer7_get_temperature
- Barometer 7 get temperature function
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* @file main.c
* @brief Barometer7 Click example
*
* # Description
* This library contains API for Barometer 7 Click driver.
* The demo application reads and calculate temperature and pressure data.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes SPI driver and log UART.
* After driver initialization the app set default settings
* and display sensor identifier data.
*
* ## Application Task
* This is an example that demonstrates the use of the Barometer 7 Click board™.
* In this example, display the Pressure ( mBar ) and Temperature ( degree Celsius ) data.
* Results are being sent to the Usart Terminal where you can track their changes.
*
* ## Additional Function
* - static void display_error ( void )
*
* @author Nenad Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "barometer7.h"
static barometer7_t barometer7;
static log_t logger;
static void display_error ( void )
{
if ( BAROMETER7_EEPROM_FEC_ERROR == barometer7.diagnosis )
{
log_printf( &logger, " EEPROM: FEC error\r\n" );
}
if ( BAROMETER7_ACQUISITION_CHAIN_FAILURE == barometer7.diagnosis )
{
log_printf( &logger, " Acquisition chain failure: Diag1\r\n" );
}
if ( BAROMETER7_SENSOR_CELL_FAILURE == barometer7.diagnosis )
{
log_printf( &logger, " Sensor cell failure: Diag2\r\n" );
}
if ( BAROMETER7_PRESSURE_OUT_OF_RANGE_HIGH == barometer7.diagnosis )
{
log_printf( &logger, " Pressure out of range: High\r\n" );
}
if ( BAROMETER7_PRESSURE_OUT_OF_RANGE_LOW == barometer7.diagnosis )
{
log_printf( &logger, " Pressure out of range: Low\r\n" );
}
}
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
barometer7_cfg_t barometer7_cfg; /**< Click config object. */
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
barometer7_cfg_setup( &barometer7_cfg );
BAROMETER7_MAP_MIKROBUS( barometer7_cfg, MIKROBUS_1 );
if ( SPI_MASTER_ERROR == barometer7_init( &barometer7, &barometer7_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
BAROMETER7_SET_DATA_SAMPLE_EDGE;
if ( BAROMETER7_ERROR == barometer7_default_cfg ( &barometer7 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
Delay_ms( 100 );;
static barometer7_identifier_t id_data;
barometer7_get_identifier ( &barometer7, &id_data );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " > Supplier : %d <\r\n", ( uint16_t ) id_data.supplier );
log_printf( &logger, " > Silicon Version : %d <\r\n", ( uint16_t ) id_data.silicon_version );
log_printf( &logger, " > Metal Version : %d <\r\n", ( uint16_t ) id_data.metal_version );
log_printf( &logger, " > ASCI Name : %c <\r\n", id_data.asic_name );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 1000 );
}
void application_task ( void )
{
static float pressure;
static float temperature;
barometer7_get_pressure( &barometer7, &pressure );
if ( BAROMETER7_NO_ERROR != barometer7.diagnosis )
{
display_error( );
}
log_printf( &logger, " Pressure : %.0f mbar\r\n", pressure );
barometer7_get_temperature( &barometer7, &temperature );
if ( BAROMETER7_NO_ERROR != barometer7.diagnosis )
{
display_error( );
}
log_printf( &logger, " Temperature : %.2f C\r\n", temperature );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 2000 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END