Team 4
Baby Peas
“Pulse Early Alarm Sensor”
Chris Ramirez
Benjamin Goolsby
Xin Tong
Yowwu Lin
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
Motivation
 Motivation



SIDS
Infant’s insignificant ability to maintain
homeostasis
Unable to express precise problems
 Motivation



behind Product
behind education and skill set
RF design
Software design
Medical field
Design Approach
 SAFETY
!!!!
 Human Computer Interface
 Usability
 Functionality



Pulse
Temperature
Position
Specifications
Device Battery Life
> 12 hours
Weight of Device
< 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
Design Decisions
 Low
Power
 Wireless
 Ease of implementation
 Vendor Support
 Low Cost
Subsystems
Sensors
Comms
Central
Processor
Power
Mobile
Application
Hardware Block Diagram
DC-DC regulator
circuit
Battery
Heart Rate Sensor
Circuit
Body Position
Sensor Circuit
Atmega328P Microprocessor
+ HC-06 Bluetooth Device
Skin Temperature
Sensor Circuit
Bluetooth
compatible
display device
Central Processor
Low
Power
Small and Mobile
Interface capability with
multiple sensors
Interface capability with
wireless devices
Atmega328p
 Arduino
development board
valuable for reference design
 AVR architecture
 16 Total Accessible Channels
 I2C, analog interfaces
Peripherals
 Temperature




Measures the temperature
on Skin surface
TI TMP006
Wafer Level Chip Scale
2.4V-5.5V
 Body



Sensor
Position Sensor
Freescale Semiconductor
MMA7361L
Accelerometer
LGA package
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



Communications
Bluetooth
CC2541
HC-06
nRF51822
2 – 3.6
3.3
1.8 – 3.6
RX current
17.9mA
N/A
13mA
TX current
18.2mA @ 0dB
8-40mA
16mA
0 dB
+6dB
+4dB
-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
< 1%
N/A
< 1%
BLE v4.0
Bluetooth v2.0+EDR
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
Input Voltage (volts)
Power Output
Receiver Sensitivity
BER
Bluetooth Protocol
POWER





Texas Instruments LP2985-33DBVR
1.5% tolerance
Constant output of 3.3V
Current output up to 150 mA
SOT-23 Package
Power Schematic
Sensor Schematics
TMP006
MMA7361L
Pulse Sensor Schematic
Atmega328p MPU Schematic
Bluetooth Schematic
Printed Circuit Board
Eagle
Cadsoft
www.4PCB.com
Board Layout
User Interface Design
 Ease


of use
Navigation
Menus
 Conducive
to the
purpose of the device
 Responsive
App Organization
Ikea Instruction
Concept Design
Build
 Soldering
LGA, BGA, QFN packages and
crystal oscillators w/ hot air pencil under
10x microscope
 Solder remaining components with solder
iron.
Test
Pulse Sensor
DC-DC Regulator
Pulse Sensor
ATMEGA328P
Mobile Application
TMP006
Accelerometer
Work Division
Goolsby
Sensors
Lin
Ramirez
Tong
X
X
X
Bluetooth
X
CPU
X
X
X
Software
X
X
Mobile App X
X
Board
Design
X
X
Power
X
X
Bill of Materials
Item:
Microprocessor
LED & Photosensor
Components
Accelerometer
TMP006
HC-06
PCB
Total …
Price (USD):
$5.19
$1.2
$33
$12
Free Sample
$10
$66
$127.39
Project Budget
Item:
Components
Accelerometer Breakout Board
AFE4490
MPU6000 Breakout
TMP006 Breakout
MMA7361L Breakout
Pulse Sensor Breakoutx2
HC-06
PCBX4
Hobbyist Version Eagle
TI Sponsorship
CC2541 Debugger
Price (USD):
$1047.31
$12
$Free Sample
$10.72
$18.77
$12
$75
$120
$354
$170
$-200
$180
Total …
$1807.79
Project Schedule
Project Progress
Project Completion
Final Presentation
Hardware Testing
APP Development
Embedded coding
PCB Layout
Schematic Capture
Development
Research
85%
90%
95%
100%
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
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
Ben’s parents
Chris’ wife
Xin Tong
Yowwu Lin
Christopher Ramirez
Ben Goolsby
Late Night
Any Questions ????