https://www.shovitobarua.com/tag/wearable-sensors/Wearable SensorsWowchemy (https://wowchemy.com)en-us© 2025 Shovito Barua SoummaMon, 28 Sep 2026 00:00:00 -0700https://www.shovitobarua.com/media/sharing.pnghttps://www.shovitobarua.com/tag/wearable-sensors/https://www.shovitobarua.com/tool/heatmind-prototype/Mon, 28 Sep 2026 00:00:00 -0700https://www.shovitobarua.com/tool/heatmind-prototype/<div class="heatmind-prototype-gallery"> <figure> <img src="https://www.shovitobarua.com/media/prototype/heatmin8.jpeg" alt="HeatMind wearable prototype secured to a forearm with electrode leads"> <figcaption>Forearm-worn HeatMind research prototype.</figcaption> </figure> <figure> <img src="https://www.shovitobarua.com/media/prototype/HeatMind5_Labeled_Red.png" alt="Labeled HeatMind prototype electronics including the controller, ECG and BioZ board, battery, and power switch"> <figcaption>Controller, physiological sensing board, battery, and power assembly.</figcaption> </figure> </div> <p>HeatMind is a wearable biomedical sensing prototype for studying physiological responses to heat exposure and physically demanding work. The current system integrates optical photoplethysmography (PPG), bioimpedance and ECG capability, and six-axis inertial sensing on a compact nRF52840 platform.</p> <figure class="heatmind-data-path"> <img src="https://www.shovitobarua.com/media/prototype/heatmind-ble-data-path.png" alt="HeatMind sensing and BLE data path from PPG, bioimpedance, and inertial sensors through the wearable controller to MATLAB"> <figcaption>Synchronized PPG, BioZ, and movement signals are processed on the wearable node and transmitted to MATLAB over Bluetooth Low Energy.</figcaption> </figure> <h3 id="biomedical-signal-pipeline">Biomedical signal pipeline</h3> <table> <thead> <tr> <th>Modality</th> <th>Measurement</th> <th>Signal-processing role</th> </tr> </thead> <tbody> <tr> <td>Optical PPG</td> <td>Infrared pulse waveform and beat intervals</td> <td>Heart-rate estimation and pulse signal-quality assessment</td> </tr> <tr> <td>Bioimpedance / ECG</td> <td>Tissue resistance and reactance with ECG capability</td> <td>Physiological monitoring using in-phase and quadrature measurements</td> </tr> <tr> <td>Six-axis IMU</td> <td>Three-axis acceleration and angular velocity</td> <td>Activity context and identification of motion-corrupted intervals</td> </tr> </tbody> </table> <p>The sensing channels are time-aligned on the wearable node and transmitted over Bluetooth Low Energy to MATLAB for live visualization, logging, and offline signal-quality analysis. The prototype currently demonstrates multimodal sensor integration, wearable packaging, and repeatable data acquisition.</p> <p><em>HeatMind is a research prototype and is not a medical device.</em></p> <style> .heatmind-prototype-gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 0 0 1.75rem; } .heatmind-prototype-gallery figure { margin: 0; } .heatmind-prototype-gallery img { display: block; width: 100%; height: 420px; object-fit: cover; border-radius: 6px; } .heatmind-prototype-gallery figcaption { margin-top: 0.5rem; color: #5f6368; font-size: 0.9rem; } .heatmind-data-path { margin: 2rem 0; } .heatmind-data-path img { display: block; width: 100%; height: auto; } .heatmind-data-path figcaption { margin-top: 0.5rem; color: #5f6368; font-size: 0.9rem; text-align: center; } @media (max-width: 768px) { .heatmind-prototype-gallery { grid-template-columns: 1fr; } .heatmind-prototype-gallery img { height: auto; max-height: 520px; object-fit: contain; } } </style>