As we all witnessed COVID-19 pandemic all over the world the virus that causes COVID-19, gets in the human body, it comes into contact with the mucous membranes that line our nose, mouth, and eyes, and infects the upper or lower part of respiratory tract. As a result, the respiratory tract and lungs swells, become irritated and inflamed. For those who develop trouble breathing, medical care outside of the home is needed. The seriously ill patients suffering from COVID-19 need respiratory support, as their lungs get damaged by the coronavirus leading to breathing difficulties. Ventilators are needed in such cases for supplying adequate oxygen into their lungs and also removing the carbon dioxide, as a lifesaving supportive measure. The ventilators are one of the most vital medical devices needed to keep these critically ill COVID-19 patients alive. The ventilator we design and develop using Arduino encompasses all these requirements to develop a reliable yet affordable ventilator to help in times of pandemic. Also, it monitors the body temperature. We use toggle switch for switching and a variable pot to adjust the breath length and the BPM value for the patient. Our system makes use of blood oxygen sensor to monitor the necessary vitals of the patient and display on a mini screen.`