Barometer 11 Click

How does it work?

Barometer 11 Click is based on the KP226E3408, an analog absolute pressure sensor from Infineon, which operates on a capacitive measurement principle and integrates a monolithic signal conditioning circuit using BiCMOS technology. The device converts applied pressure directly into a highly precise analog voltage output, with a calibrated transfer function that maps pressures from 15kPa to 400kPa into a corresponding output range of 0.35V to 4.65V. With a high-accuracy pressure measurement capability of ±3.8kPa and excellent sensitivity, the sensor ensures reliable performance in applications requiring precise environmental or process monitoring.

Designed to function in harsh conditions, it supports an extended operating temperature range from -40°C to 140°C, enabling use in diverse environments. While primarily intended for automotive manifold absolute pressure measurement, its versatile performance characteristics make it equally suitable for various industrial automation, environmental sensing, and consumer product implementations where stable, accurate pressure data is essential.

This Click board™ is designed in a unique format supporting the newly introduced MIKROE feature called "Click Snap." Unlike the standardized version of Click boards, this feature allows the main sensor/IC/module area to become movable by breaking the PCB, opening up many new possibilities for implementation. Thanks to the Snap feature, the BQ25188 can operate autonomously by accessing its signals directly on the pins marked 1-8. Additionally, the Snap part includes a specified and fixed screw hole position, enabling users to secure the Snap board in their desired location.

The signal conditioning and amplification for the KP226E3408 sensor are handled by the LMV321, a low-voltage rail-to-rail operational amplifier from Texas Instruments, ensuring precise and stable amplification of the sensor's low-level output signal. After amplification, the conditioned signal is routed to the AD SEL switch, providing the user with the flexibility to choose between analog and digital output modes depending on the specific requirements of their application. When analog output is selected, the amplified signal is made available directly on the AN pin of the mikroBUS™ socket, allowing for straightforward integration with analog signal processing circuits.

For digital signal acquisition, the board incorporates the MCP3221 from Microchip, a 12-bit resolution analog-to-digital converter that enables high-accuracy digital conversion and communicates via the standard 2-wire I2C interface, ensuring compatibility with a wide range of MCUs and digital systems. The output mode selection is easily configured through the onboard surface-mount device (SMD) switch labeled AD SEL, which allows users to toggle between the analog (AN) position and the digital (I2C) position to accommodate diverse application scenarios and design preferences.

At the very top of the Snap section, four test points are positioned to provide direct access for measurement, communication, and programming operations with the onboard sensor. TP1 carries the sensor’s test signal, enabling verification and diagnostics of its operational performance. TP2 provides the external clock input used for communication or delivers the programming voltage signal required during sensor configuration and calibration. TP3 and TP4 serve as the serial data input and output pins of the sensor, forming the core of its test and programming interface. This layout allows engineers to easily connect diagnostic tools, external programmers, or development equipment to monitor signals, apply configuration parameters, and conduct functional testing without interfering with the standard operational circuitry.

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.

Click Snap

Click Snap is an innovative feature of our standardized Click add-on boards, designed to bring greater flexibility and optimize your prototypes. By simply snapping the PCB along predefined lines, you can easily detach the main sensor/IC/module area, reducing the overall size, weight, and power consumption - ideal for the final phase of prototyping. For more details about Click Snap, visit the official page dedicated to this feature.

Specifications

Pinout diagram

This table shows how the pinout on Barometer 11 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Analog Output	AN	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	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 11 Click electrical specifications

Software Support

Barometer 11 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Example Description

This example demonstrates the use of the Barometer 11 Click board by initializing the device and reading the barometric pressure data in millibar units. The pressure value is periodically logged to the USB UART every second.

Key Functions

• barometer11_cfg_setup This function initializes Click configuration structure to initial values.
• barometer11_init This function initializes all necessary pins and peripherals used for this Click board.
• barometer11_read_voltage_avg This function reads a desired number of ADC samples and calculates the average voltage level.
• barometer11_read_pressure This function reads the pressure level [mBar].

Application Init

Initializes the logger and the Barometer 11 Click driver.

Application Task

Reads and displays the pressure data every second.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.