Mikroelektronika d.o.o.
Tableau de clic Pressure 21
Tableau de clic Pressure 21
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Key Features:
- Faible consommation d'énergie, hautes performances, stabilité de température améliorée, performances de sortie et de bruit programmables, interruption programmable, interface sélectionnable, etc.
- Basé sur le BMP581 - capteur numérique de pression barométrique et de température de Bosch Sensortec
- Peut être utilisé pour diverses applications basées sur la pression, industrielles, grand public, stations météorologiques, etc.
- mikroBUS : interfaces I2C et SPI
La carte Click Board™ Pressure 21 est une carte complémentaire compacte qui contient un capteur de pression monté sur carte. Cette carte comprend le BMP581, un capteur de pression barométrique absolue de Bosch Sensortec. Le BMP581 offre une précision relative de ±6 Pa et une précision absolue typique de ±30 Pa avec un bruit ultra-faible, une faible consommation d'énergie et une stabilité de température ainsi qu'une sortie programmable : température uniquement ou pression et température (la pression uniquement n'est pas prise en charge). Il convertit les données de sortie en une valeur numérique 24 bits et envoie les informations via une interface hôte configurable qui prend en charge les communications série SPI et I2C. Il mesure la pression de 30 kPa à 125 kPa sur une large plage de températures de fonctionnement. Cette carte Click board™ est adaptée à diverses applications basées sur la pression, industrielles, grand public, stations météorologiques, etc.
La carte Click Board™ Pressure 21 est supportée par une bibliothèque compatible mikroSDK, qui comprend des fonctions qui simplifient le développement logiciel. Cette carte Click Board™ est un produit entièrement testé, prêt à être utilisé sur un système équipé du socket mikroBUS™.
How Does The Pressure 21 Click Board™ Work?
The Pressure 21 Click Board™ as its foundation uses the BMP581, a high accuracy, low power, barometric pressure, and temperature sensor solution from Bosch Sensortec. The BMP581 provides proper absolute pressure and temperature measurements, due to on-chip linearization and temperature compensation, from 30kPa to 125kPa over a wide operating temperature range from -40 to +85°C. It also provides a relative accuracy of ±6Pa and typical absolute accuracy of ±30Pa with ultra-low noise, low power consumption, and temperature stability alongside programmable output: temperature-only or both pressure and temperature (pressure-only is not supported).
The BMP581 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 BMP581 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 21 Click Board™ allows using both I2C and SPI interfaces with a maximum frequency of 1MHz 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 BMP581 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, the threshold over/underrun, data-ready, and more.
The Pressure 21 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, industrial, consumer, weather stations, and more |
| On-board modules | BMP581 - digital barometric pressure and temperature sensor from Bosch Sensortec |
| Key Features | Low power consumption, high performance, improved temperature stability, programmable output and noise performance, programmable interrupt, selectable interface, 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 21 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 | ADDR SEL | Left | I2C Address Selection 0/1: Left position 0, Right position 1 |
| JP2-JP5 | COMM SEL | Right | Communication Interface Selection SPI/I2C: Left position SPI, Right position I2C |
PRESSURE 21 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | - | 3.3 | - | V |
| Pressure Measurement Range | 30 | - | 125 | kPa |
| Relative Pressure Accuracy | - | ±6 | - | Pa |
| Absolute Pressure Accuracy | - | ±30 | - | Pa |
| Resolution | - | 24 | - | bit |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the Pressure 21 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 The package Manager (recommended), downloaded from our LibStock™ or found on MikroE Github account.
Library Description
This library contains API for the Pressure 21 Click Board™ driver.
Key functions
-
pressure21_get_int_pinThis function returns the INT pin logic state. -
pressure21_get_sensor_dataThis function reads the sensor measurements data: pressure in Pascals and temperature in Celsius. -
pressure21_write_registerThis function writes a desired data to the selected register.
Example Description
This example demonstrates the use of the Pressure 21 Click Board™ by reading and displaying the pressure and temperature measurements.
void application_task ( void )
{
if ( pressure21_get_int_pin ( &pressure21 ) )
{
float pressure, temperature;
if ( PRESSURE21_OK == pressure21_get_sensor_data ( &pressure21, &pressure, &temperature ) )
{
log_printf ( &logger, " Pressure: %.2f mBarrn", pressure * PRESSURE21_PA_TO_MBAR );
log_printf ( &logger, " Temperature: %.2f Crnn", temperature );
}
}
}
The full 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 MikroE Github account.
Other MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.Pressure21
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 21 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.
Tableau de clic Pressure 21
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