Barometer 9 Click

How does it work?

Barometer 9 Click is based on the ENS220, a state-of-the-art barometric pressure and temperature sensor from ScioSense for applications such as activity tracking and indoor navigation/localization. This sensor stands out for its ultra-low power consumption and high accuracy, offering a dual-mode communication interface that can operate through digital I2C or SPI interfaces. Embedded within a CMOS ASIC, the ENS220’s capacitive pressure sensor facilitates a compact package size while ensuring robust resistance to environmental changes. The integration of a capacitive read-out mechanism contributes to its minimal power usage. It boasts a high sensitivity to pressure and incorporates an ultra-low noise 24-bit ADC converter, minimizing pressure noise significantly. The sensor also includes a precision temperature sensor, providing stable, temperature-compensated pressure readings with quick response times.

Key features of the ENS220 include a pressure range from 300 to 1200hPa, exceptional absolute accuracy within ±0.5hPa, and relative accuracy of ±0.025hPa, which translates to an altitude resolution of around 20cm. Its ultra-low pressure noise of 0.1Pa RMS at a 2Hz sampling rate and the ability to adjust the sampling rate up to 1kHz, achieving 0.9 Pa RMS, is also noteworthy. Additionally, it delivers temperature measurements with an accuracy of ±0.1K and a resolution of 8mK.

Barometer 9 Click offers flexibility through its support for both SPI and I2C interfaces, selectable via the COMM SEL jumpers. By default, the I2C interface is active, supporting Fast mode operation up to 400kHz, whereas the SPI mode accommodates clock frequencies up to 1MHz. The sensor’s interrupt feature is a significant addition, enabling it to alert the host processor about specific events, such as pressure thresholds, through the INT pin, optimizing for ultra-low power consumption scenarios.

The ENS220 operates optimally at 1.8V, a power supply level provided by the TLV700, a low-dropout (LDO) regulator from Texas Instruments, sourced directly from the selected mikroBUS™ socket’s power rail. Because the ENS220’s power supply is 1.8V, this board also facilitates appropriate logic level conversion via the TXS0108E voltage level translator from Texas Instruments.

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.

Specifications

Pinout diagram

This table shows how the pinout on Barometer 9 Click 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
Power Enable / ID SEL	RST	2	RST	INT	15	INT	Interrupt
SPI Select / ID COMM	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	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Barometer 9 Click electrical specifications

Software Support

We provide a library for the Barometer 9 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Barometer 9 Click driver.

Key functions

• barometer9_read_part_id This function is used to read a Device ID of Barometer 9 click board.

• barometer9_get_temperature This function is used to read a temperature of Barometer 9 click board in degree of Celsius.

• barometer9_get_pressure This function is used to read a pressure of Barometer 9 click board in Pascals.

Example Description

This example demonstrates the use of Barometer 9 Click board by reading and displaying the pressure and temperature measurements.

void application_task ( void ) 
 { 
     float temperature = 0; 
     float pressure = 0; 

     barometer9_get_temperature( &barometer9, &temperature ); 
     barometer9_get_pressure( &barometer9, &pressure ); 
     log_printf( &logger, " Temperature: %.2f C rn Pressure %.3f Pa rn", temperature, pressure ); 
     log_printf( &logger, " - - - - - - - - - - rn" ); 
     Delay_ms( 1000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio 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.Barometer9

Additional notes and informations

Depending on the development board you are using, you may need 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. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE 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.

For more information about mikroSDK, visit the official page.