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.

• 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: 2.7V_Min, 3.3V_Typ, 5.5V_Max
  • Note: Qwiic bus operates at 3.3V_Max
• Interrupt breakout pad
• Dual Qwiic connectors
• Power LED (configurable)
• I²C pull-ups (configurable)

• Board Dimensions
• Arduino Library
• Schematic
• Eagle files
• GitHub Hardware Repo