Useful resource for people designing ventilators: the NHS's spec for what they require in a bare-bones emergency ventilator for COVID-19 https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/874279/RMVS001_Rapidly_Manufactured_Ventilator_Specification__PDF.pdf …
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Note that this spec *immediately* rules out several of the "open-source ventilator" designs on the internet, since they do not even measure or regulate pressure!
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https://gitlab.com/open-source-ventilator/OpenLung …, http://web.mit.edu/2.75/projects/DMD_2010_Al_Husseini.pdf …, https://github.com/jcl5m1/ventilator …, and https://www.youtube.com/watch?v=1t2t8d8xtD0&feature=youtu.be … don't have pressure sensors!
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To be clear: I am NOT sharing this info to discourage engineers or spread FUD. I am NOT saying "stop contributing and just follow the CDC/FDA/WHO's lead." I think open-source engineering projects can be extremely useful if they get the *right information* about what's needed.
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Open-source ventilation: If you don't have pressure and volume sensors, you're doing it wrong!
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