nRF54LM20 BLE Fitness Tracker
Build a high-end BLE fitness tracker with the nRF54LM20 — the most capable nRF54L chip offering 2MB Flash for rich GATT services, sensor fusion, and OTA DFU with ultra-low standby current.
Build a high-end BLE fitness tracker with the nRF54LM20 — the most capable nRF54L chip offering 2MB Flash for rich GATT services, sensor fusion, and OTA DFU with ultra-low standby current.
Platform: nRF54LM20
The flagship nRF54L series SoC built on a 22nm process, featuring a 128 MHz ARM Cortex-M33 + RISC-V co-processor with 2MB Flash and 512KB RAM — the largest memory in the nRF54L family. Supports Bluetooth LE, Matter, Thread, Zigbee, and 2.4 GHz proprietary protocols up to 4 Mbps. The nRF54LM20A variant adds 66 GPIOs and high-speed USB; the nRF54LM20B adds an integrated Axon NPU for hardware-accelerated Edge AI inference. Security includes TrustZone, CRACEN cryptographic engine with side-channel protection, and tamper detection.
Use Case: BLE Fitness Tracker
Wearable fitness device that tracks activity, heart rate, and sleep patterns over Bluetooth Low Energy, syncing data to a companion mobile app.
Why This Combination
The nRF54LM20's 2MB Flash accommodates multiple concurrent GATT services, full accelerometer gesture recognition, and an LE Audio profile — making it the platform for premium fitness wearables.
Key Protocols
ble
What FirmwareMaestro Generates
For this solution, FirmwareMaestro produces a complete project package:
- Product Requirements (PRD)
- Firmware Architecture
- Hardware Abstraction Layer (HAL) design
- State Machine specification
- Code Scaffold (
main.c,prj.conf,CMakeLists.txt,Kconfig) - Devicetree overlay for the target board
- AI-pair-programming
.cursorrules - Build and flash instructions
See the Code Scaffolds guide for details.
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