SparkX Differential Pressure Sensor - SDP31 (Qwiic)

The SDP31 differential pressure sensor is ideally suited to air flow rate and air speed measurement. Need an air speed indicator for your drone / model aircraft or want to measure flow rate / filter clogging in your robot vacuum cleaner? This is the sensor for you!

The SDP3x sensor family is Sensirion’s series of small differential pressure sensors designed for high-volume applications where size is a key requirement. It builds on the next generation CMOSens® sensor chip that is at the heart of Sensirion’s new differential pressure and flow sensing platform.

Able to measure differential pressures in the range +/- 500 Pascals (+/- 0.005 Atm), the SDP31 is ideally suited to flow rate and air speed applications. The two mounting holes on our board are aligned with the center of the SDP31 package; the high and low pressure sensing tubes are offset by 0.65mm and separated by 4.3mm. Please consult the datasheet or STEP file for more details.

The digital SDP31 sensor features fast measurement speed, excellent accuracy and long-term stability and has no zero-point drift. Furthermore, it is reflow solderable and provides extended functionality, such as smart averaging, multiple temperature compensation modes, configurable I2C address and interrupts. The I2C address can be configured using the split-pad jumpers on the back of the board. The interrupt pin is available on a breakout pad.

As usual, our board includes a power LED, a pair of Qwiic connectors, I2C breakout pads and pull-up resistors. You can disable the LED and pull-ups if you need to by cutting the I2C jumpers on the back of the board.

OpenLog Artemis provides full support for data logging with the SDP31.

Our Arduino library contains example sketches for the Arduino IDE to get you up and running quickly. There are examples for both single-shot (triggered) and continuous measurements.

The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.

Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.
  • Sensirion SDP31 Differential Pressure Sensor
    • Pressure measurement range: -500 to 500 Pa (-2 to 2 inH2O)
    • Temperature measurement range: -40 °C to +85 °C
    • Pressure and temperature resolution: 16-bit
    • Zero point accuracy: 0.1 Pa
    • Flow step response time: < 3ms
    • Calibrated for: Air, N2
    • Calibrated temperature range: -40 °C to +85 °C
    • Operating Temperature Range: -40 °C to +85 °C
    • Start-up time: 25 ms
    • I2C address (configurable): 0x21, 0x22, 0x23
    • Supply Voltage: 2.7VMin, 3.3VTyp, 5.5VMax
    • Note: Qwiic bus operates at 3.3VMax
  • Interrupt breakout pad
  • Dual Qwiic connectors
  • Power LED (configurable)
  • I2C pull-ups (configurable)


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • austrisv / about a year ago * / 1

    what is expected tube diameter for this breakoutboard? by any chance, do you carry appropriate tube accessories at sparkfun?

    update: read more on the sensor in SDP documentation

    I guess, the question is if you have the adaptor as shown in "Figure 2.3: Example of an adaptor piece for tubes". Thanks!

  • Member #515761 / about 3 years ago / 1

    Have you verified the functionality of the continuous measurements with averaging? I've tested the example code and varied the measurement read interval from 0.1 to 10 seconds. The readings exhibit similar noise (standard deviation) regardless of the read interval. This seems to indicate that the sensor is still just sampling the pressure value. Same is true if the averaging boolean is set true or false with a 10 second interval between reads.

  • Member #1038550 / about 3 years ago / 1

    Hi would it be possible to use it for a Pitot tub ?

  • xsk8rat / about 3 years ago / 1

    Cool! Application of interest: with an open ended hose measuring the depth in a shallow pool or stream. Though the full range is only 2 inH2O. :^( Nice resolution and +-3% accuracy! I know i'm being lazy (again/still), but you usually have a link to the datasheet,..?

    • Member #767295 / about 3 years ago / 2

      Hi, You can find the datasheets in the hardware repo:

      Best wishes, Paul

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