Portfolio: Wearable Tracking Solutions

Wearable Breathing and Meditation Coach Enhancement

This project focuses on the firmware development for a wearable device designed for breathing and meditation coaching, which monitors and records vital signs. The device is powered by the nRF52832 microcontroller, and the firmware utilizes Zephyr OS.

  • Development of ECG signal processing using Kalman Filter.
  • Implementation of improved wake-up methods for the device.
  • Integration of continuous monitoring features for real-time data collection.

Applications:

  • Health and wellness monitoring
  • Meditation and breathing exercises

Technologies Used:

  • nRF52832 microcontroller
  • Zephyr OS
  • C programming

Smart Cat Collar

The Cat Collar is a cutting-edge device designed to track the position of cats and facilitate training through ultrasonic sounds. It serves the dual purpose of ensuring the safety of cats by monitoring their location and training them to avoid danger zones using sound stimuli.

Hardware Development:

Hardware and PCB design

Flex PCB design.

Firmware Development:

  • Utilizing the ME310 module for GPS location tracking and updating it on the portal.
  • NB-IoT connectivity via the ME310 module and a SIM card for communication.
  • Integration of a buzzer to indicate the cat’s position in case of loss, initiated through the portal.
  • Ultrasonic buzzer for generating frequencies based on the distance between the cat and defined danger zones, with varying frequencies based on proximity.
  • Data logging mechanism for collecting and analyzing location and ultrasonic frequency data to assess the cat’s response to stimuli.

Applications:

  • IOT
  • Pet Tech market

Technologies Used:

  • MCU: ATSAMD21
  • GPS and IoT Module: ME310
  • Connection: NB-IoT
  • SD card for data logging

TRACKTICS Tracker

The TRACKTICS Tracker is a wearable device designed for football players, offering comprehensive tracking and analytics. This device captures detailed performance metrics to help athletes optimize their training and gameplay. The project involved the development of both hardware and firmware.

Hardware Development:

  • Designed and developed the PCB layout and schematic.
  • Implemented antenna design for wireless communication.
  • Developed USB 2.0 interface for data transfer and device connectivity.

Firmware Development:

  • Developed firmware using STM32 microcontrollers.
  • Implemented real-time operating system (FreeRTOS) for efficient task management.

Applications:

  • Athlete training optimization
  • Real-time tracking
  • Health and fitness monitoring

Technologies Used:

  • STM32
  • Development Environment: Eclipse
  • ST-Link Debugger
  • FreeRTOS
  • WiFi, Bluetooth, GPS.
  • USB2.0
Case Study RED - Oxeltech

Smart Dog Collar – Health & Location Monitoring System

A next-generation pet wearable that provides pet owners with 24/7 health insights and real-time location tracking, enabling better preventive care, peace of mind, and stronger human-pet bonds through technology. This compact, durable collar integrates advanced biosensing and IoT connectivity for continuous monitoring and reporting.

Key Features:

  • Health Monitoring: Heart rate and respiratory rate sensing via piezo sensors and microphones, plus activity classification from IMU data.
  • Location Tracking: Built-in GNSS for real-time positioning, with cellular connectivity for cloud integration and BLE for local sync.
  • Biosensing Innovation: Dual-modality measurement combining mechanical (piezo) and acoustic (microphone) sensing for higher accuracy in vital sign detection.

Hardware Development

  • Hardware and rigid PCB design tailored for a compact wearable form factor.
  • Power management architecture optimized for small battery capacity with efficient energy handling.
  • Multi-radio RF design enabling cellular / GNSS / BLE coexistence with robust antenna performance.

Firmware Development:

  • RTOS Architecture: Modular design using FreeRTOS for multitasking.
  • Drivers & Communication: UART, SPI, and I²C interfaces for sensors and radio modules.
  • Sensor Processing: GPS parsing, IMU data acquisition with filtering, and activity classification.
  • Biosensing Algorithms: Heart and respiratory rate extraction from piezo and microphone signals.
  • Connectivity: BLE pairing and data sync routines; secure cloud API integration for health and location data.
  • Reliability & Updates: Firmware Over-The-Air (FOTA), event-based health alerts, watchdog timers, and fail-safe logging.

Power Optimization:

  • Deep sleep modes and peripheral shutdown for extended battery life.

Applications:

  • IoT-based Pet Health Monitoring
  • Pet Tech / Smart Pet Devices Market

Technologies Used:

  • MCU: ESP32 (WiFi + Bluetooth), Silabs EFR32xG21
  • GPS & IoT Module: SIMCOM A7682S (CAT M1 for low-power wide-area connectivity)
  • Flash Storage: BY25Q16AWTIG
  • IMU Sensor: ICM-42670-P
  • Additional Sensors: Piezoelectric/Dual microphone sensors for activity and physiological data

Smart Heated Undergarments – Menstrual Relief Wearable

This wearable device was developed to provide targeted thermal relief to women during the menstrual cycle. Integrated into undergarments, the system delivers controlled heat at three levels (Low, Medium, High) to reduce cramps and discomfort. The design focuses on safe, efficient, and user-customizable heating using embedded electronics and softPWM-based control.

Key Features:

  • Multi-level heating control (Low / Medium / High)
  • SoftPWM-based smooth thermal transitions
  • Battery-powered with USB-C PD (PowerBank support)
  • Real-time temperature feedback and logging
  • Seamless integration into garments for comfort and safety.

Applications:

  • Women’s Health & Wellness Tech
  • Smart Wearables for Pain Relief

Technologies Used:

  • MCU: Nordic nRF52833 (BLE + ARM Cortex-M4F)
  • RTOS: FreeRTOS-based firmware architecture
  • Power Management IC: Texas Instruments TPS65987
  • ADC: ADS1440 for temperature sensing
  • Heating Control: Custom softPWM for multi-level thermal output
  • Power Source: External Power Bank (USB-C)
  • Data Logging: Onboard event and temperature logs for analysis

Firmware Development Overview:

  • Real-time task management using FreeRTOS (heating control, BLE communication, logging)
  • BLE service for user interaction (app-controlled temperature levels)
  • SoftPWM implementation for efficient and safe heating control
  • Temperature feedback loop using ADS1440 ADC
  • USB-C PD negotiation and power handling via TPS65987
  • Persistent logging of usage patterns and temperature history
  • Safety features: overheat protection, timeout-based auto shutoff
  • Low-power modes and optimized runtime for power bank usage
  • Firmware modularization for easy scalability and future feature addition

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