Diff Press 2 Click is a compact add-on board that contains Sensirion’s differential pressure sensor. This board features the SDP31-500PA, a small differential pressure sensor designed for high-volume applications. The SDP31-500PA comes with a configurable host interface that supports I2C serial communication and measures pressure in a range from -500Pa up to +500Pa with an accuracy of 3%. It comes as calibrated and temperature compensated with high reliability/long-term stability, has the best signal-to-noise ratio. It operates in a temperature range of -40°C to 85°C, ensuring stable operation under extreme conditions. This Click board™ is suitable for weather station equipment, industrial, consumer applications, and similar applications which rely on accurate and reliable pressure monitoring.

Diff Press 2 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Diff Press 2 Click as its foundation uses the SDP31-500PA, a highly versatile differential pressure sensor designed for high-volume applications from Sensirion. It builds on the next-generation CMOSens® sensor chip at the heart of Sensirion’s new differential pressure and flows sensing platform. It features fast measurement speed, excellent accuracy, and long-term stability, has no zero-point drift, and offers an ultra-low power consumption, making the SDP31-500PA the perfect choice for applications where accurate and reliable pressure monitoring is essential.

The SDP31-500PA is very flexible regarding measurement speed. This flexibility allows for optimizing the sensor’s performance to a specific application and for adapting the sensor to different use cases. For example, the sensor detects the smallest and quickest changes in one use case, whereas, in another mode, the sensor can measure in larger intervals while consuming only little energy.

Diff Press 2 Click communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting Fast Mode up to 400kHz. Besides, the SDP31-500PA allows choosing the least significant bit (LSB) of its I2C peripheral address using the SMD jumper labeled ADDR SEL. It also possesses an additional interrupt signal, routed on the INT pin of the mikroBUS™ socket labeled as INT, indicating when a specific interrupt event occurs, such as indicating whether new measurement results are available.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the I2C communication lines properly. However, the 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.

• Interface: I²C
• Compatibility: mikroBUS™
• Dimensions: 42.9 x 25.4mm
• Input Voltage: 3.3V or 5V
• Measurement Range: Min. -500 Pa, Max. 500 Pa
• Accuracy: 3%
• Resolution: 16 bit
• Operating Temperature Range: Min. -40°C, Typ. +25°C, Max. +85°C

• Schematic
• SDP31 Datasheet
• mikroSDK
• GitHub