Mikroelektronika d.o.o.
SKU: MIKROE-4747Pressure 15 Click Board
Pressure 15 Click Board
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The Pressure 15 Click Board™ is a compact add-on board that contains a board-mount pressure sensor. This board features the LPS27HHW, an ultra-compact piezoresistive absolute pressure sensor that functions as a digital output barometer from STMicroelectronics. The device comprises a sensing element and an IC interface that communicates through I2C or SPI serial interface from the sensing element to the application. The sensing element, which detects absolute pressure in a range of 260 up to 1260hPa, consists of a suspended membrane manufactured using a dedicated process developed by STMicroelectronics.
The Pressure 15 Click Board™ is suitable for weather station equipment, altimeter and barometer applications, industrial, consumer applications, and many more.
How Does The Pressure 15 Click Board™ Work?
The Pressure 15 Click Board™ as its foundation uses the LPS27HHW is a high-resolution, ultra-compact piezoresistive absolute pressure sensor that functions as a digital output barometer from STMicroelectronics. The complete device includes a sensing element based on a piezoresistive Wheatstone bridge approach which detects absolute pressure in a range of 260 up to 1260hPa, and a serial interface that communicates a digital signal from the sensing element to the application.
The LPS27HHW has a unique cylindrical package solution with an entire metal lid assembled on a ceramic substrate. When pressure is applied, the membrane deflection induces an imbalance in the Wheatstone bridge piezoresistance, whose output signal is then converted by the chosen serial interface.
The Pressure 15 Click Board™ provides the possibility of using both I2C and SPI interfaces with a maximum frequency of 100kHz in Standard and 400kHz in Fast mode for I2C and 8MHz for SPI communication. The selection can be made by positioning SMD jumpers labelled as COMM SEL to an appropriate position. Note that all the jumpers' positions must be on the same side, or else the Click board™ may become unresponsive. While the I2C interface is selected, the LPS27HHW allows the choice of the least significant bit (LSB) of its I2C slave address using the SMD jumper labelled as ADDR SEL.
Also, the LPS27HHW features a Data-Ready signal, routed on the INT pin of the mikroBUS™ socket, which indicates when a new set of measured pressure data are available, simplifying data synchronization in the digital system that uses the device.
The Pressure 15 Click Board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before use with 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 weather station equipment, altimeter and barometer applications, industrial, consumer applications, and many more |
| On-board modules | LPS27HHW, high-resolution, ultra-compact piezoresistive absolute pressure sensor that functions as a digital output barometer from STMicroelectronics |
| Key Features | Low power consumption, high precision, wide absolute pressure measurement range, selectable serial interface, selectable I2C slave address, interrupt/data-ready feature, 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 on the Pressure 15 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/JP4 | COMM SEL | Left | Communication Interface Selection SPI/I2C: Left position SPI, Right position I2C |
| JP2 | ADD SEL | Left | I2C Address Selection 0/1: Left position 0, Right position 1 |
Pressure 15 Click electrical specifications
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | - | 3.3 | - | V |
| Operating Pressure Range | 260 | - | 1260 | hPa |
| Pressure Output Data Resolution | - | 24 | - | bits |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the Pressure 15 Click Board™ as well as 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 Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe Github account.
Library Description
This library contains an API for the Pressure 15 Click Board™ driver.
Key Functions
pressure15_cfg_setup- Config Object Initialization function.pressure15_init- Initialization function.pressure15_default_cfg- Click the Default Configuration function.
Example Description
The demo application is composed of two sections :
void application_task ( void )
{
if ( pressure15_get_int( &pressure15 ) )
{
float temperature, pressure;
pressure15_get_pressure( &pressure15, &pressure );
log_printf( &logger, " > Pressure[hPa]: %.2frn", pressure );
pressure15_get_temperature( &pressure15, &temperature );
log_printf( &logger, " > Temperature[degC]: %.2frn", temperature );
log_printf( &logger, "***************************************rn" );
Delay_ms( 200 );
}
}
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.Pressure15
Additional Notes and Information
Depending on the development board you are using, you may need a 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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
mikroSDK
The Pressure 15 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 15 Click Board
Frequently Asked Questions
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