IoT-Based Wireless Digital Stethoscope

The advancement of smart healthcare technologies and the increasing adoption of the Internet of Things (IoT) have transformed modern medical diagnostics by enabling intelligent, connected, and portable healthcare devices. This paper presents the design and development of an IoT-enabled wireless digital stethoscope capable of capturing, amplifying, processing, and transmitting heart and lung sounds for remote medical diagnosis. Conventional acoustic stethoscopes suffer from limitations such as low sound amplification, dependency on physician hearing ability, lack of data storage, and inability to support remote consultations. To overcome these challenges, the proposed system integrates a high-sensitivity MEMS microphone with the MAX9814 audio amplifier and an ESP32 microcontroller for signal acquisition and wireless communication. The acquired body sounds are digitized, filtered, and transmitted to a mobile application and cloud platform through Wi-Fi/Bluetooth connectivity. Additionally, a DS18B20 temperature sensor is incorporated to monitor body temperature simultaneously, enabling multi-parameter patient monitoring. The proposed device supports real-time remote auscultation, digital recording, cloud storage, and data sharing between healthcare professionals and patients. The system is portable, low-cost, and suitable for telemedicine, rural healthcare, and emergency medical applications. Experimental analysis demonstrates improved sound clarity, efficient wireless transmission, and reliable physiological monitoring. The integration of IoT with biomedical signal processing significantly enhances diagnostic accuracy and accessibility of healthcare services.