Portable Non – Invasive Device for ECG and EMG Monitoring

Abstract— This project proposes the design and implementation of a portable, non-invasive ECG and EMG monitoring system using the ESP32-S3 microcontroller. The system is capable of capturing and displaying real-time bioelectrical signals from the human body using two dedicated sensors—an AD8232 module for electrocardiogram (ECG) signal acquisition and a modular EMG sensor for muscle activity monitoring. The ESP32-S3’s built-in ADC is used to digitize the signals, which are then processed and displayed as scrolling waveforms on a 320×240 SPI TFT display. A push-button interface is incorporated to switch between ECG and EMG modes, allowing users to monitor both heart and muscle signals dynamically. Each mode is visually distinguished with color-coded waveforms—red for ECG and green for EMG—ensuring clarity and ease of interpretation. Additionally, the system logs the sensor values to the serial monitor in real time for further analysis and debugging. The entire hardware is compactly assembled on an acrylic casing, providing a professional and ergonomic enclosure. This cost-effective solution demonstrates a reliable and user-friendly approach to basic bio signal monitoring and is suitable for applications in academic research, physiotherapy, wearable health tech development, and biomedical education. Keywords—ESP32-S3, ECG Monitoring, EMG Signal, Non-Invasive Sensors, Biomedical Signal Acquisition, Real-Time Visualization, TFT Display, Portable Monitoring System, IoT Health Applications.