• Rahul Lilhare
• Anshul Yerne
• Ayush Shambharkar
• Parthiv Dumbhare
• Omkar Hastak

Psychological and occupational stress is clinically recognized as a major catalyst for cardiovascular pathology, hypertension, cognitive fatigue, and psychosomatic disorders. Conventional clinical diagnostics rely on cumbersome polysomnography or stationary electrocardiograms, which are non-ambulatory, costly, and ill-suited for real-time daily monitoring. This paper presents the architecture, embedded algorithmic realization, and experimental validation of an open-source, wearable Internet of Things (IoT) BioStress monitoring apparatus. The system integrates three complementary non-invasive physiological transducers: an analog Galvanic Skin Response (GSR) sensor measuring electrodermal sudomotor activity, an optical MAX30105 photoplethysmography (PPG) transceiver measuring capillary pulse volume and heart rate (BPM) via a Peripheral Beat Amplitude (PBA) algorithm, and a digital DS18B20 OneWire sensor detecting peripheral cutaneous vasoconstriction. A dual-core 240 MHz ESP32 microcontroller executes real-time sensor fusion, deriving a normalized composite BioStress Index (0–100) and driving a 0.96-inch SSD1306 OLED multi-slide display with rolling graphic buffers. Telemetry data is concurrently published over encrypted 802.11 b/g/n Wi-Fi via MQTT over TLS (port 8883) to HiveMQ Cloud and visualized on an interactive web dashboard. Empirical evaluations under standardized cognitive stressors (Stroop and mental arithmetic tests) demonstrated a 252% increase in skin conductance (from 4.2 µS to 14.8 µS), a 38% rise in heart rate (from 71 to 98 BPM), and a 1.6°C peripheral skin temperature drop. The prototype achieves an end-to-end telemetry latency under 70 ms with 99.9% packet delivery ratio at a hardware cost below 2,500 INR, offering an accessible solution for occupational safety and telehealth monitoring.

BioStress Monitoring, Electrodermal Activity (EDA), Galvanic Skin Response (GSR), Photoplethysmography (PPG), ESP32 Microcontroller, Internet of Things (IoT), MQTT Telemetry, HiveMQ Cloud.

"Design and Empirical Evaluation of a Real-Time IoT BioStress Monitoring System Using Galvanic Skin Response, Photoplethysmography, and Cutaneous Thermometry", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.13, Issue 10, page no.c903-c906, October-2026, Available :http://www.jetir.org/papers/JETIR2610292.pdf

"Design and Empirical Evaluation of a Real-Time IoT BioStress Monitoring System Using Galvanic Skin Response, Photoplethysmography, and Cutaneous Thermometry", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.13, Issue 10, page no. ppc903-c906, October-2026, Available at : http://www.jetir.org/papers/JETIR2610292.pdf