Low cost ventilator for urgent cases of COVID-19

These inexpensive ventilators can be produced for extreme emergencies like  when medical resources are depleted to help the medical field keep more people with breathing difficulties safe while they receive the proper treatment. All the parts can be 3D printed with low cost materials and also with low cost technologies and it can be adapted to different ambu bags sizes, in addition to it is programed Arduino (universal low cost micro-controler) and it can control the volume of air suministration depanding to the patient and all the componets that it needs can be obtained easaly. The only things that may be more difficult to have are sensors that read oxygen and air concentrations, but some hospital equipments have those sensors.