Abstract: COVID-19 pandemic highlighted the urgent need for affordable respiratory aid systems, particularly in low-resource areas. This article introduces the design and development of an affordable, Arduino-based intelligent ventilator with the ability to monitor real-time SpO₂ and heart rate. The system makes airflow control changes in real time through fuzzy logic and sends emergency notifications through a GSM module when oxygen saturation falls below 90%. It integrates a MAX30100 pulse oximeter, R385 diaphragm pump, SIM800L GSM module, and uses a dual-cell lithium-ion battery with buck conversion for voltage regulation. It showcases how affordable components and smart control can facilitate efficient, portable respiratory assistance.

Keywords: Portable ventilator, Arduino Uno R4, SpO₂ monitoring, fuzzy logic control, GSM alert system, MAX30100, emergency healthcare, embedded systems

| DOI: 10.17148/IARJSET.2025.125338