Team Impact Intelligent Helmet Impact System Preliminary Design Review January 29 th, 2008 Amanda Brodbeck Wei-Chu Liao Wei-Shen Liao Chris Mintle

Project Summary Design and prototype an intelligent helmet that wirelessly transmits real time sensor data for collection and processing by a base station

Project Purpose Potential use in medical surveillance –Monitor impacts to see if forces exceed safety limits –Visually help medical staff determine if player needs medical attention after an impact Has potential to be expanded to monitor physiological statuses –Pulse –Temp –Blood Oxygen Level –Brain Activity

System Diagram LabVIEW GUI SPI Analog

Implementation of the Various Sub-Systems Sensors Control system Power Transceiver HelmetBase Station Transceiver Power Interface Computation Visual Display

Sensors Accelerometers –Dual axis high impact: ADXL278 (+/- 50g) –Single axis high impact: ADXL78 (+/- 50g) –Analog output Temperature * -Analog or Digital Others

Control Systems TI MSP430F169 Communicates with each sensor Records sensor data Processes sensor data –Build in A/D Converter Continuous sampling of data Package data for transceiver

Power System Battery Portable/low profile Switching converter Rechargeable Long lasting 3.3V for all digital components Helmet DC only Base station power from USB

Transceiver Surface mount Hardware layer integrated protocol –Preferred Long range Up to 2Mbps Low power SPI connection to microcontroller Time-stamped packets Nordic nRF24L01

Base Station Transceiver is the same Microcontroller Interface to PC using USB Visual Display –LabVIEW –GUI –Data processing

GUI

Budget

Division of Labor and Responsibilities Software –Microcontroller and peripherals => Amanda, Ben –RF Link => Chris, Tom –Base station GUI => Chirs, Tom Hardware –Part selection => Everyone –PCB =>Everyone

Schedule Overview

Project Milestones CDR- part selection, system schematics, and basic microcontroller functionality. Milestone I - basic RF link, sensors communicate with microcontroller, and revision 1 of PCB completed and integrated. Milestone II – basic GUI, RF data transfer, and revision 2 of PCB completed and integrated. EXPO- working prototype.

Risks and Contingency Plan 1.Wireless Link between Helmet and Base Station adds complexity to project Contingency: serially link nodes and base station 2.Number of helmets in network adds complexity Contingency: decrease number of helmets or have only one helmet in network 3.Battery powered Contingency: hard wired power supply

Risks and Contingency Plan 4.Long Range Communication Distance (>80m) Transceiver require too much power draw to transmit over large distances Contingency: Scale back required distance of communication 5.GUI with Advanced Helmet information Contingency: Simplify GUI

Questions?