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.
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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 https://sensirion.com/media/documents/64B851A2/6166D9E5/Sensirion_Differential_Pressure_AppNotes_SDP3x_Engineering-Guideline.pdf
I guess, the question is if you have the adaptor as shown in "Figure 2.3: Example of an adaptor piece for tubes". Thanks!
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.
Hi would it be possible to use it for a Pitot tub ?
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,..?
Hi, You can find the datasheets in the hardware repo:
Best wishes, Paul