Mikroelektronika d.o.o.
SKU: MIKROE-5296Pressure 18 Click Board
Pressure 18 Click Board
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Key Features
- Low power consumption and low noise, accuracy, wide measurement range, performance, interrupt feature, selectable interface, long-term stability, and more
- Based on the BMP384 - absolute barometric pressure sensor from Bosch Sensortec
- Can be used for various pressure-based applications, altitude tracking, industrial, consumer, weather stations, and more
- mikroBUS: I2C and SPI Interfaces
The Pressure 18 Click Board™ is a compact add-on board that contains a board-mount pressure sensor. This board features the BMP384, a robust barometric pressure sensor delivering market-leading accuracy in a compact package from Bosch Sensortec. The BMP384 provides a relative accuracy of ±9Pa and typical absolute accuracy of ±50Pa with ultra-low noise, low power consumption, and a temperature coefficient offset of ±1Pa/K. 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 300hPa to 1250hPa over a wide operating temperature range. This Click board™ is suited for various pressure-based applications, altitude tracking, industrial, consumer, weather stations, and more.
The Pressure 18 Click Board™ is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click board™ comes as a thoroughly tested product, ready to be used on a system equipped with the mikroBUS™ socket.
How Does The Pressure 18 Click Board™ Work?
The Pressure 18 Click Board™ is based on the BMP384, a high accuracy, low-power, and low noise 24-bit absolute barometric pressure sensor from Bosch Sensortec. The BMP384 consists of a piezo-resistive pressure sensing element and a mixed-signal ASIC that performs A/D conversions and provides the conversion results alongside sensor-specific compensation data through a digital interface. It also provides the highest flexibility and can be adapted to the requirements regarding accuracy, measurement time, and power consumption by selecting many possible combinations of the sensor settings.
The BMP384 is very accurate, covering a wide measurement pressure range from 300hPa to 1250hPa, alongside a relative accuracy of ±9Pa (equivalent to ±75cm difference in altitude), the typical absolute accuracy of ±50Pa, and a temperature coefficient offset of ±1Pa/K. This feature makes it suitable for water-level detection and differential barometric pressure measurements.
This sensor operates in three power modes: Sleep, Normal, and Forced Mode. The Normal Mode comprises automated perpetual cycling between an active measurement period and an inactive Standby period. In Sleep Mode, no measurements are being performed, while in Forced Mode, a single measurement performs. When a measurement is finished, the BMP384 returns to Sleep Mode. Also, a set of oversampling settings are available, ranging from ultra-low power to highest resolution setting to adapt the Click board™ to the target application.
The Pressure 18 Click Board™ allows using both I2C and SPI interfaces with a maximum frequency of 3.4MHz for I2C and 10MHz for SPI communication. The selection can be made by positioning SMD jumpers labelled as COMM SEL in an appropriate position. Note that all the jumpers' positions must be on the same side, or the Click board™ may become unresponsive. While the I2C interface is selected, the BMP384 allows choosing the least significant bit (LSB) of its I2C slave address using the SMD jumper labelled ADDR SEL. This Click board™ also possesses an additional interrupt pin, routed to the INT pin on the mikroBUS™ socket, indicating when a specific interrupt event occurs, such as FIFO overflow, data-ready, and more.
The Pressure 18 Click Board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | Pressure |
| Applications | Can be used for various pressure-based applications, altitude tracking, industrial, consumer, weather stations, and more |
| On-board modules | BMP384 - absolute barometric pressure sensor from Bosch Sensortec |
| Key Features | Low power consumption and low noise, accuracy, wide measurement range, performance, interrupt feature, selectable interface, long-term stability, and more |
| Interface | I2C,SPI |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V |
PINOUT DIAGRAM
This table shows how the pinout of the Pressure 18 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | INT | Interrupt | |
| SPI Chip Select | CS | 3 | CS | RX | 14 | NC | |
| SPI Clock | SCK | 4 | SCK | TX | 13 | NC | |
| SPI Data OUT | SDO | 5 | MISO | SCL | 12 | SCL | I2C Clock |
| SPI Data IN | SDI | 6 | MOSI | SDA | 11 | SDA | I2C Data |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | NC | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1-JP3 | COMM SEL | Left | Communication Interface Selection SPI/I2C: Left position SPI, Right position I2C |
| JP4 | ADDR SEL | Left | I2C Address Selection 0/1: Left position 0, Right position 1 |
PRESSURE 18 CLICK BOARD ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | - | 3.3 | - | V |
| Pressure Measurement Range | 300 | - | 1250 | hPa |
| Relative Pressure Accuracy | - | ±9 | - | Pa |
| Absolute Pressure Accuracy | - | ±50 | - | Pa |
| Resolution | - | 24 | - | bit |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the Pressure 18 Click Board™ and a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on MikroE Github account.
Library Description
This library contains API for the Pressure 18 Click Board™ driver.
Key functions
-
pressure18_get_int_pinThis function returns the INT pin logic state. -
pressure18_read_dataThis function reads the sensor measurements data: pressure in Pascals and temperature in Celsius. -
pressure18_soft_resetThis function performs the software reset feature.
Example Description
This example demonstrates the Pressure 18 Click Board™ by reading and displaying the pressure and temperature measurements.
void application_task ( void )
{
if ( pressure18_get_int_pin ( &pressure18 ) )
{
float pressure, temperature;
if ( PRESSURE18_OK == pressure18_read_data ( &pressure18, &pressure, &temperature ) )
{
log_printf ( &logger, " Pressure: %.1f mBarrn", pressure * PRESSURE18_PA_TO_MBAR );
log_printf ( &logger, " Temperature: %.2f Crnn", temperature );
}
}
}
The complete application code, and ready-to-use projects can be installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on the MikroE Github account.
Other MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.Pressure18
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, 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.
MIKROSDK
The Pressure 18 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Pressure 18 Click Board
Frequently Asked Questions
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