Spirometer is a pulmonary function test that assesses the strength of our lungs to measure the maximum amount of air that is breathed in and out. During physical therapy, spirometers are frequently employed to evaluate lung capacity and chest responsiveness. Yet, the majority of spirometers accessible in the market are both digital and come with a high cost. which cannot be affordable for a large population. A portable spirometer prototype designed for measuring lung volume and air flow rate can also serve to monitor a patient's health progress, particularly post-recovery from respiratory ailments. such as COVID, asthma, etc. The COVID-19 pandemic has taken a massive toll on medical infrastructure, and this was especially true at the inception of this project. The proposed spirometer in this work is based on Arduino NANO and is It proves particularly valuable for individuals recovering from COVID-19 to evaluate their lung efficiency in the comfort of their own homes.