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Design Constraint Presentation

Design Constraint Presentation. Team 5: Sports Telemetry Device. Project Overview. Measure impacts experienced by football players to monitor and detect potential brain injury Communicate measurements to sideline over mesh network

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Design Constraint Presentation

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  1. Design Constraint Presentation Team 5: Sports Telemetry Device

  2. Project Overview • Measure impacts experienced by football players to monitor and detect potential brain injury • Communicate measurements to sideline over mesh network • Analyze collected data as game progresses using research done by the Purdue Neurotrauma Group

  3. Microcontroller Design Constraints • Basic computational requirements • Continuously sample accelerometers/gyros, store to NAND flash, send to sideline • Peripheral Requirements • SPI (Wireless Module), ADC (Sensors), USB Interface (Data retrieval/charging), Timer Module • External Interfacing Requirements • Sensors • Three 3-axis accelerometers (analog) • Two 2-axis gyroscopes (analog) • 2kHz sampling rate, preferably 12-bit resolution • NAND Flash memory • >= 8Gb • Ultra-fast read/write • Three capacitive sensors (power on/off) • RF Module • Low power consumption • Battery must last (at minimum) the duration of a football game • Low cost • Affordable for majority of families

  4. Microcontroller Candidates • Atmel ATxmega256A3BU • Max I/O pins: 47 • SPI channels: 8 • ADC channels: 16, 12-bit • ADC sampling rate: 2kHz • Extras: USB interface, temp. sensor, timer module, low power • Lacks: NAND interface • PIC24HJ64GP206A • Max I/O pins: 85 • SPI modules: 2 • ADC channels: 32, 10-bit • ADC sampling rate: Up to 1.1MHz • Extras: Idle/Sleep/Doze modes • Lacks: NAND interface

  5. Wireless Module Design Requirements • Small footprint • Minimum 60m range • Low power consumption • Sleep mode, if possible • Robust protocol supporting: • Self-organizing mesh network • Network self-healing • Operation within ISM radio band (2.4GHz) • At least 200kbps transmission rate, ideally

  6. Wireless Module Candidates • XBee XBP24BZ7PIT-004 • Frequency band: 2.4GHz • Line of sight range: 300ft (~90m) minimum • Supply current: {xmit: 205mA, rec.: 47mA} • Data rate: 250kbps • Dimensions: 33mm x 24mm x 3mm • Interface: UART • Notes: Requires bulky antenna, supports robust mesh network • Atmel ATZB-24-A2 • Frequency band: 2.4GHz • Line of sight range: ~50m minimum (based on TI) • Supply current: {xmit: 18mA, rec.: 19mA} • Data rate: 250kpbs • Dimensions: 24mm x 13mm x 2mm • Interface: SPI, UART • Notes: compact onboard antenna, supports robust mesh network, interfaces easily with Atmel ATxmega256A3BU microcontroller

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