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Case Study

Wearable multi radio data acquisition module

A miniature vibrating, Bluetooth audio streaming & rechargeable data acquisition module that collects data from 433MHz TX devices. Hub is integrated with an iOS Mobile/Watch App which has Bluetooth connectivity to it.

Project Size: 11 members
Project Duration: 4 months
Technology Used: BLE/BT 4.1, 433.92MHz Sub GHz RF, eMMC 5.1, Li-po battery, iOS.
Interfaces available: Micro USB,BLE/BT, Four User configurable buttons, Power slide switch, 3 RGB status LEDs, Low power battery indication



  • Form factor constraints – 42x60x8mm
  • Having two radio interfaces (433MHz and BLE/BT) with on-board PCB antenna in this form-factor


  • Rechargeable & replaceable Li-po powered vibrating miniature central hub for multiple Unifi Tx devices
  • Easy Configuration of Thumper device & event detection using iOS Mobile & Watch App
  • USB Mass-storage device & firmware upgrade via Bluetooth


Wearable data acquisition module - System architecture

1) Feasibility study and Documentation
  • Requirements Gathering & Analysis, competitive product study,
  • H/W Architecture development and finalization
  • Component selection for all components & BoM Management
2) Hardware design (Schematics)
  • Part selection to minimal footprint as possible to accumulate all interfaces in required PCB dimensions.
  • Design done in view of passing radio certifications with proper EMC guidelines.
  • Tool: Cadence OrCAD Capture CIS
3) PCB design (Layout)
  • Complex PCB design of very small form-factor of 42X60mm.
  • Intra and Inter Length matching and spacing for all critical high speed interfaces.
  • Critical placement & routing of radio signals (433.92MHz, BT) to ensure optimum performance.
  • 6L 1.6mm PCB with BGA fanout micro Via Structure
  • Tool: Cadence Allegro PCB Designer
4) Fab and Assembly House co-ordination
  • DFM and DFA
  • Preparing low cost CBoM’s with low cost alternatives identified for high cost parts.
  • Life time check for components in BoM.
5) Bring-up and Testing
  • Initial bring-up of the board followed by detailed Electrical interface verification.
  • Testing on iOS platform.
6) Firmware Application development
  • Integration of Bluetopia stack for BLE/BT Dual module
  • 433 MHZ RF integration in GPIO mode in custom protocol format
  • STBCFG01JR Fuel Gauge driver development and integration
  • eMMC 5.1 driver development and integration
  • Sophisticated state machine development for multiple event handling and status updation
  • Remote firmware upgrade support
  • FreeRTOS integration
  • Pairing and audio playback to a BT Classic ear piece.

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