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Flow and pressure meter

There are very many open source ventilator design projects ongoing in the world. Most of them are very simple and lack measurement capability to measure flow and pressure. This is critical to safely adjust ventilators to the patient.

Therefore the purpose of this project is to develop an inexpensive measuring device to A) test open source ventilators, B) monitor ventilator splitting setups, C) potentially be part of components in open source ventilator designs.

Raspberry PI display

The display receives JSON data from the sensor hub and displays graphs and key values. The software will be published as open source. An early video demo is available here,

Arduino sensor hub

The sensor hub contains a digital airway pressure sensor and a digital differential high accuracy pressure sensor for venturi tube measurements. The hub collects data with 50 samples per seconds and transmits JSON data to a display device. The software will be published as open source. The electronics are built on an Arduino Proto shield and could be made into a shield with a real printed circuit board in the future. 3mm ID tubing is used for measured signals and connections are made with Luer-lok connectors.

Design and requirements

  • Measure absolute pressure (lung pressure)
  • Measure flow rates in range 0-60L/min
  • Small resistence (i.e pressure drop)
  • Based on venturi pipe
  • Based on small inexpensive differential pressure sensors
  • Standard ventilator fittings
  • 3D printed design that can be autoclaved
  • Based on Raspberry pie and an arduini
  • Curve form display and digital measurement values

First version of calibration curve. goals.xlsx


Sven Forsberg, Lundinova ABProject leader, electronics, sensors,…
Petter Frieberg, Klinfys, LundFlow simulations
Einar Heiberg, Klinfys, LundDocumentation, all-in-all
Erik Ekbom, BFT, SUS 3D printing

Project timeline

  • 2020-05-20 Display software done. Pressure sensor done. Differential pressure and Vanturi tube optimization.
  • 2020-04-08 Second project meeting, demo of display system
  • 2020-04-07 Calibration curve of sensor
  • 2020-04-03 Material ordered
  • 2020-04-02 First flow simulations and initial design, sensors identified
  • 2020-04-01 Project start, initial design parameters
  • 2020-03-31 Project idea, first connection

Design files

Design files will be made available once a stable prototype is available. In the mean time, please contact us for details.

flowandpressuremeter.txt · Last modified: 2020/05/20 09:49 by