Team 4 Baby Peas

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Team 4Baby PeasPulse Early Alarm Sensor

• Chris Ramirez
• Benjamin Goolsby
• Xin Tong
• Yowwu Lin

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What is Baby Peas ???

• Infants are weak
• Traditional monitors do not tell the whole
  picture
• Empirical data is needed
• Biomarkers can give peace of mind

3
Motivation

• Motivation behind Product
• SIDS
• Infants insignificant ability to maintain
  homeostasis
• Unable to express precise problems
• Motivation behind education and skill set
• RF design
• Software design
• Medical field

4
Design Approach

• SAFETY !!!!
• Human Computer Interface
• Usability
• Functionality
• Pulse
• Temperature
• Position

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Specifications
Device Battery Life gt 12 hours
Weight of Device lt 0.5 pounds
Dimensions (Anklet) 50 x 100 x 15 mm
Heart Rate Accuracy 20
Skin Temperature Accuracy 20
Position Accuracy Back, Stomach
Wireless Transmission Range 100 Feet
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Design Decisions

• Low Power
• Wireless
• Ease of implementation
• Vendor Support
• Low Cost

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Subsystems
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Hardware Block Diagram
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Central Processor

• Low Power
• Small and Mobile
• Interface capability with multiple sensors
• Interface capability with wireless devices

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Atmega328p

• Arduino development board valuable for reference
  design
• AVR architecture
• 16 Total Accessible Channels
• I2C, analog interfaces

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Peripherals

• Temperature Sensor
• Measures the temperature on Skin surface
• TI TMP006
• Wafer Level Chip Scale
• 2.4V-5.5V
• Body Position Sensor
• Freescale Semiconductor MMA7361L
• Accelerometer
• LGA package

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Peripherals (cont.)

• Pulse Sensor
• Kingbright 515 nm LED
• APDS-9008 ambient light photo sensor (565 nm peak
  sensitivity)
• 
  Left to right-
• 
  Atmega328p, TMP006
• 
  HC-06, MMA7361L,
• 
  Bottom right is pulse
• 
  Sensor

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Communications
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Bluetooth
CC2541 HC-06 nRF51822
Input Voltage (volts) 2 3.6 3.3 1.8 3.6
RX current 17.9mA N/A 13mA
TX current 18.2mA _at_ 0dB 8-40mA 16mA
Power Output 0 dB 6dB 4dB
Receiver Sensitivity -94dBm at 1 Mbps -87dBm -93dBm
Frequency 2.4 GHz 2.4 GHz 2.4 GHz
Data Rates 250 kbps, 500 kbps, 1 Mbps, 2 Mbps 3Mbps 250 kbps, 1Mbps, 2Mbps
BER lt 1 N/A lt 1
Bluetooth Protocol BLE v4.0 Bluetooth v2.0EDR BLE v4.0
Special Features Microcontroller and RF module combined RF module Microncontroller and RF module combined
Solder Package 40 pin QFN (visible) 34pin module 48 pin QFN (visable)
Cost 6.62 (Digikey) 10.68 4.95
Lead Time Ready to Ship Ready to Ship Ready to Ship
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POWER

• Texas Instruments LP2985-33DBVR
• 1.5 tolerance
• Constant output of 3.3V
• Current output up to 150 mA
• SOT-23 Package

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Power Schematic
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Sensor Schematics
TMP006
MMA7361L
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Pulse Sensor Schematic
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Atmega328p MPU Schematic
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Bluetooth Schematic
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Printed Circuit Board

• Eagle Cadsoft
• www.4PCB.com

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Board Layout
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User Interface Design

• Ease of use
• Navigation
• Menus
• Conducive to the purpose of the device
• Responsive

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App Organization
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Ikea Instruction
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Concept Design
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Build

• Soldering LGA, BGA, QFN packages and crystal
  oscillators w/ hot air pencil under 10x
  microscope
• Solder remaining components with solder iron.

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Test
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Work Division
Goolsby Lin Ramirez Tong
Sensors X X X
Bluetooth X
CPU X X X
Software X X
Mobile App X X
Board Design X X
Power X X
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Bill of Materials

• Item Price
  (USD)
• Microprocessor 5.19
• LED Photosensor 1.2
• Components 33
• Accelerometer 12
• TMP006 Free Sample
• HC-06 10
• PCB 66
• Total 127.39

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Project Budget

• Item Price
  (USD)
• Components 1047.31
• Accelerometer Breakout Board 12
• AFE4490 Free Sample
• MPU6000 Breakout 10.72
• TMP006 Breakout 18.77
• MMA7361L Breakout 12
• Pulse Sensor Breakoutx2 75
• HC-06 120
• PCBX4 354
• Hobbyist Version Eagle 170
• TI Sponsorship -200
• CC2541 Debugger 180
• Total 1807.79

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Project Schedule
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Project Progress
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Difficulties and Lessons Learned

• Software Development Licenses (IAR embedded
  workbench 30 day)
• C2541 8051 processor
• BLE protocol stack understanding
• MIT app developer integration
• PCB layout learning curve
• HC-06 soldering
• Pulse Sensor sensitivity in ankle area

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Thanks

• Dr. Chan
• John Edison
• Dr. Abichar
• Dr. Richie
• David Johnston (L3 communications RF Engineer)
• Brandon Patterson (Full Sail software Engineer)
• Cadsoft Eagle staff
• Texas Instruments
• Arduino Save Us
• Bens parents
• Chris wife
• Xin Tong
• Yowwu Lin
• Christopher Ramirez
• Ben Goolsby

36
Late Night
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Any Questions ????