Custom Firmware for Medical-Grade BLE Wearable
Developed production firmware for a continuous health-monitoring wearable device running on a Nordic nRF5340 SoC.
// Technologies Used
The Challenge
The client needed certified, ultra-low-power firmware for a wearable that had to run for 7 days on a coin cell, maintain a reliable BLE connection to an iOS/Android app, and meet IEC 62304 medical software lifecycle requirements.
Our Solution
We implemented the firmware in C on top of Zephyr RTOS, leveraging the nRF5340 dual-core architecture — the network core handled all BLE stack operations while the application core ran sensor fusion algorithms. Power profiling and aggressive sleep-state management achieved the 7-day battery target. A Flutter companion app provided the iOS/Android interface.
The Results
Shipped to 5,000 units in first production run. Battery life exceeded spec at 8.2 days. BLE connection reliability reached 99.7% in real-world testing. IEC 62304 documentation delivered on schedule.
"Their embedded expertise saved us months of development time and the quality of the firmware exceeded our expectations."