The project was developed during my freshman year at the University of Patras as a collaborative effort within the IEEE EMBS Student Branch Chapter.
While the overall project involved a team of three, this repository specifically showcases my contribution: the software architecture and real-time digital signal processing. The project serves as a practical application of biomedical engineering principles, focusing on real-time muscle activity monitoring.
The project was a result of a team collaboration:
- Software & Firmware (My Role): Developed the C/C++ logic for signal acquisition, rectification, and envelope detection on the ESP32.
- Hardware & PCB Design: Designed by team members, focusing on the analog front-end and signal amplification.
- Systems Integration: Collaborative testing and validation of the end-to-end system.
The code implements a real-time processing pipeline for raw analog bio-signals:
- ADC Scaling: Converts 12-bit raw ADC values from the ESP32 (0-4095) to actual voltage levels (0-3.3V).
- Full-Wave Rectification: Pure C implementation of signal rectification using
fabsf. - Envelope Detection (LPF): Implemented a Low-Pass Filter (LPF) using an exponential moving average (Alpha-filter) to extract the signal envelope.
- Modular Design: The processing logic is decoupled from the main hardware loop (
emg_proc.h/c), allowing for easy testing and scalability.
emg_main.c: The main entry point (Arduino-based) that handles sensor sampling and data visualization.emg_proc.c: Core signal processing algorithms (Rectifier, Envelope Detector).emg_proc.h: Header file defining theProcessedEMGdata structure and function prototypes.
graph LR
A[Raw Analog Signal] --> B[12-bit ADC Conversion]
B --> C[Voltage Scaling]
C --> D[Full-Wave Rectification]
D --> E[Envelope Detection - LPF]
E --> F[Serial Plotter Output]
Aimilia Saranti Undergraduate ECE Student @ University of Patras HR Head at IEEE Student Branch UPatras Passionate about the intersection of Engineering and Medicine.
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Developed under the auspices of IEEE EMBS University of Patras Student Branch.