Our project respond to the lack of respirators for the covid19 crisis Nevertheless we faced many problems making our specifications. We faced the lack of a health care open source standard There isn't nor open source or low-tech designs available nor documentation on the safety precautions that should be taken building medical device


We had a lot of ideas for a respirator design, because of the quarantine we had to use spar parts that we had on hand. The all hackaton is articulated around two projects: -One very low tech that we could build this week end or with poor part sourcing. -One more High tech that could be built with the proper parts. We think these two designs are to be made because they respond to the same crisis but in different situations.

Any way, Both are between 50 and hundreds of euros(depending of which sensors or touchscreens or enclosures that are choosen, price can be brought down with scale) And both designs could use the same solution for control and monitoring.

1)EvoCyclone (the low tech solution):

Low tech using conventional mechanical parts from a bicycle,a car and a BVM bag EvoCyclone version 1.0. Artificial respirator allowing 10 to 30 cycles per minute. The first problem in all of the projects is the containment situation. It is complicated to reproduce the current GPL projects. This is why, we based ourselves on an apparatus to realize starting from materials at disposal.

2)Tesla3DAir High tech solution 3DPrint:

High tech using 99% of 3d printing parts (12V DC turbine using PWM software to manage the speed of the turbine without unaffordable proportional valve concept, mobile, autonomous (ups battery) with conventional medical enclosure, touchscreen, monitoring (decentralize by wireless in option) with ALL the parameters and configurations like a industrial one but for a fraction of the price)

The second solution would lay basis for a standardizable sensor hub and monitoring solution.

To respond to a wide range of demands and means That standard was followed: "Failure conditions must allow for conversion to manual control by the clinician, i.e. if automatic ventilation fails, conversion to immediate ventilation must be immediate."

What you have done during the weekend

Before this hackaton we discussed a lot about open source respirators, we used this week end to put in practice these ideas.

We designed and built the low tech prototype and we developed some failsafes: detecting the motor speed, detect stalling in case the BVM is blocking allow stopping only in open jaw position detecting of the BVM presence

We would like to add a heart rate sensor We have perfected the mechanism allowing better compression while saving force. The advantage of two free rolls, allows to limit friction with the balloon.

We designed our high tech concept based on a CPAP turbine but controlled using PWM.

We missed some parts to build and test it but we did a diagram of it.



The solution’s impact to the crisis

The impact will be quite consequent because we propose a development kit from parts that are easily found by makers, tinkerers, and engineers. The device could be easily transported to other countries as disease spikes around the world. The solution can be assembled quickly with parts that can be found in any country in the world; Our concept will cost less than 100€ and 100% recyclable.and portable.

The necessities in order to continue the project

Concerning the Evocyclone, we would like to shape this project by writing a survival manual that could allow to produce it, with easy soucable parts.

Concerning the Tesla3dAir, it is a nice opportunity of citizen-public-private partnership with the goal to make a proof of concept and produce a MVP (minimum viable product).

We’d like to point out the fact that ResistanceCovid is a community of more than 400 makers and 200 3d printers, really to run as soon as tomorrow.

What we need is a safe place to test our ideas, contact with medical professionals to debat our ideas and legal and financial support in order to carry out our project in this pandemic.

The value of your solution(s) after the crisis

After the crisis we’d like to have designs and manual to quickly build vital devices in case of a future emergency.The solution has been designed to use as many reusable spare parts as possible, which allows existing material to be reused and will not lose value. We have for ambition to establish an open source standard for medical field, one that could be quickly updated and adopted in case of a future health crisis.

The URL to the prototype [Github, Website,...]

Evocyclone :


Site :


Compte Facebook:

Compte Twitter:

Github :


Saïd Deraoui | Thierry Morea | Eric Saint-Arroman |Gregory Herreman | Anis Haboubi |Stéphane Holemans


Resistancecovid, we are a group of IT enthusiasts from various parts of Europe. We are actively working on the implementation of 3D printing protocols to meet the present and future needs of the nursing staff in front of the Covid-19.

EvoCyclone version 1.0. Artificial respirator allowing 10 to 30 cycles per minute. The first problem in all of the projects is the containment situation. It is complicated to reproduce the current GPL projects.

This is why, we based ourselves on an apparatus to realize starting from materials at disposal. Here, pinion and chain of bicycle, motor of windscreen wiper of car and the unit supplying in 12V.

Scalable, EvoCyclone can work with two IR sensors, a selector, a drive motor (H bridge circuit) and a NE555 that can be easily found in everyday devices.

Coupled with an Arduino UNO, here it is therefore possible to embark with an ARM architecture and a second Arduino board (MEGA). This development allows the addition of cardiac sensor, pressure sensor and other precision devices.

What it does and how we built it

The principle is based on a simple and robust device with as principle an elution from minimum materials. EvoCyclo is currently composed of:

Challenges we ran into

Allow the development in Kit so as to allow certain to work different aspects of the projects. The idea being to use the principle of jumper in order to activate or not the functionalities.

Enabling the implementation of a complete system with security systems allowing it to be produced with components that can be easily found even in the most remote areas.

Accomplishments that we're proud of

Evocyclone is a civic and completely participative achievement. In this situation, our group allowed production to outsource and decentralize for more than 10,000 people, with a handful of 100 amateur 3D printers.

Proud to offer a device built from common materials and allowing this project to be matched by other more sophisticated projects or at least to respond to problems that we have encountered and that we have been able to circumvent.

What we learned

We continue to learn but we have already learned when the diversion of certain materials such as the car windshield wiper motor, the manufacture of a heart sensor from two Ir diodes or the use of the pressure sensor. One of the things we learned is that the ballon does not wear out with this free roulette mechanism.

What's next for Resistancecovid - EvoCyclo - The first project LowTech

We are busy integrating some sensors into the evolving EvoCyclone device. In the immediate future two IR (redundancy) sensors making it possible to detect:

  1. If the engine is running
  2. How fast.
  3. Detect motor blockage (force on the ball).
  4. Allow stopping only in open jaw mode.

And an ultrasonic sensor to detect the present of the balloon before ignition. We also want to add a heart sensor and the set coupled to an alarm buzzer.

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