which was next on my list

I got to the scheme, but then I found a faceshield at an affordable price that was ready-made

they built an industry portable ventilator into a suitcase using custom PCB

but given they included all the specs and schmetics

Arduino, Pi, chip-24 anything can be used as brains nowadays

dead simple to simply redesign for using Arduino or Raspi 3D printer hardware

yeah, especially if the pdf i have is reimplemented in marlin

it would in essence turn the electronics of your 3d printer into the electronics of the ventilator (after printing the nessecary parts)

AT tiny 45/85 chip can be programmed with Arduino/Pi/PC and then used for youtr project

yup

Much more spreadable solution

that's why i am looking at a Marlin implementation

Arduino board is a bit of an overkill for an implementation

You want a lover level electronics there

that firmware already has all the common libraries for various different pieces of interface hardware

AT tiny costs up to 2.5$ for a piece

only thing need is a ventillator rather than 3d printer application

Arduino is like $20

yup

but AT-Tiny has fewer PWMs

You can output 20 custom boards with AT chip at a price of one arduino

And same function

https://twitter.com/Smug_Legend/status/1242572155382046721

isn't AT-Tiny based onf the ESP-838?

Well you only need so many modes of operation for that AT tiny chip

4 modes is enough for a ventilator

the point of such a project though would be speed of production

thus writting a control routine in marlin would make the most sense

I will contact Conrad to see if I they have chips on hand for that

because you can then load it on ANY of those platforms

Also aquarium pumps

I have an idea

just like you can load marlin on any ramps

Thank you MA

I have a Pi and an Arduino, I can make them into chip programmers, and then 3D print masks

A bit of disassembly on aquarium pump and new brains and voila- personal ventilator

Reference page 51

https://www.nxp.com/docs/en/application-note/DRM127.pdf

You are gonna LOVE this

Aquarium pump is by far the best match for this. It is purpose made to overcome a bit of air pressure