30 min

Maintain controlled environments by monitoring pressure variations with ICP-10111 and STM32F417ZG

Barometers: Nature's weather whisperers

Barometer 4 Click with UNI-DS v8

Published Oct 14, 2023

Click board™

Barometer 4 Click

Development board



NECTO Studio



Discover the versatility of barometers in diverse fields, from agriculture to aviation, as they contribute to efficiency and precision in a wide range of applications



Hardware Overview

How does it work?

Barometer 4 Click is based on the ICP-10111, an ultra-low power, low noise, digital output barometric pressure and temperature sensor from TDK InvenSense. It is based on an innovative MEMS capacitive pressure sensor technology that can measure pressure from 30kPa up to 110kPa with an accuracy of ±1Pa over a wide operating temperature range at the industry’s lowest power. This high-accuracy MEMS capacitive pressure sensor can also measure altitude differentials down to 8.5cm without the penalty of increased power consumption or reduced sensor throughput. The ICP-10111 also offers industry-leading temperature stability of the pressure sensor with a temperature coefficient offset of

±0.5Pa/°C. The high accuracy, temperature stability, and low power consumption offered by ICP-10111 make it ideally suited for applications such as drone flight control and stabilization, indoor/outdoor navigation, sports and fitness activity monitoring, and battery-powered IoT. The ICP-10111 also requires a supply voltage of 1.8V to work regularly. Therefore, a small LDO regulator, BH18PB1WHFV from Rohm Semiconductor, provides 1.8V out of mikroBUS™ power rails. This LDO cuts power consumption by lowering its current consumption to approximately 2μA when the application operates in the Standby state. Barometer 4 Click communicates with MCU using a standard I2C 2-Wire interface that supports

400kHz Fast Mode operation. Since the sensor for operation requires a 1.8V logic voltage level only, this Click board™ also features the PCA9306 voltage-level translator from Texas Instruments. The I2C interface bus lines are routed to the dual bidirectional voltage-level translator, allowing this Click board™ to work properly with both 3.3V and 5V MCUs. 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.

Barometer 4 Click top side image
Barometer 4 Click bottom side image

Features overview

Development board

UNI-DS v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different STM32, Kinetis, TIVA, CEC, MSP, PIC, dsPIC, PIC32, and AVR MCUs regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, UNI-DS v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the UNI-DS v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector. Communication options such as USB-UART, USB

HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. UNI-DS v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

UNI-DS v8 horizontal image

Microcontroller Overview

MCU Card / MCU



8th Generation


ARM Cortex-M4

MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

Power Supply
I2C Clock
I2C Data
Power Supply

Take a closer look


Barometer 4 Click Schematic schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the UNI-DS v8 as your development board.

Fusion for PIC v8 front image hardware assembly
Buck 22 Click front image hardware assembly
SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly
v8 SiBRAIN MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for Barometer 4 Click driver.

Key functions:

  • barometer4_get_pressure_and_temperature - Barometer 4 get pressure and temperature function

  • barometer4_get_raw_data - Barometer 4 get RAW data function

  • barometer4_soft_reset - Barometer 4 software reset function

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

 * @file main.c
 * @brief Barometer4 Click example
 * # Description
 * This library contains API for the Barometer 4 Click driver.
 * The library initializes and defines the I2C bus drivers 
 * to write and read data from registers.
 * This demo application shows an example of 
 * atmospheric pressure and temperature measurement.
 * The demo application is composed of two sections :
 * ## Application Init
 * The initialization of the I2C module and log UART.
 * After driver initialization and default settings, 
 * the app display device ID.
 * ## Application Task
 * This is an example that shows the use of a Barometer 4 Click board™.
 * Logs the atmospheric pressure [ Pa ] and temperature [ degree Celsius ] data.
 * Results are being sent to the Usart Terminal where you can track their changes.
 * @author Nenad Filipovic

#include "board.h"
#include "log.h"
#include "barometer4.h"

static barometer4_t barometer4;
static log_t logger;

void application_init ( void ) 
    log_cfg_t log_cfg;                /**< Logger config object. */
    barometer4_cfg_t barometer4_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.
    barometer4_cfg_setup( &barometer4_cfg );
    BAROMETER4_MAP_MIKROBUS( barometer4_cfg, MIKROBUS_1 );
    err_t init_flag = barometer4_init( &barometer4, &barometer4_cfg );
    if ( I2C_MASTER_ERROR == init_flag ) 
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );

    barometer4_default_cfg ( &barometer4 );
    log_info( &logger, " Application Task " );
    log_printf( &logger, "----------------------------\r\n" );
    Delay_ms( 100 );
    static uint16_t device_id;
    err_t err_flag = barometer4_get_device_id( &barometer4, &device_id );
    if ( BAROMETER4_ERROR == err_flag ) 
        log_error( &logger, " Communication Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    log_printf( &logger, " Device ID   : 0x%.4X \r\n", device_id );
    log_printf( &logger, "----------------------------\r\n" );
    Delay_ms( 1000 );

void application_task ( void ) 
    static float pressure;
    static float temperature;
    barometer4_get_pressure_and_temperature( &barometer4, &pressure, &temperature );
    log_printf( &logger, " Pressure    : %.2f Pa\r\n", pressure );
    log_printf( &logger, " Temperature : %.2f C\r\n", temperature );
    log_printf( &logger, "----------------------------\r\n" );
    Delay_ms( 1000 );

void main ( void ) 
    application_init( );

    for ( ; ; ) 
        application_task( );

// ------------------------------------------------------------------------ END

Additional Support