Pressure 18 Click Board™

Product Code: MIKROE-5296

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 Des