Transcript Team 4 Baby Peas *Pulse Early Alarm Sensor

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
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
SIDS
Infant’s insignificant ability to maintain
homeostasis
Unable to express precise problems
 Motivation
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
behind Product
behind education and skill set
RF design
Software design
Medical field
Design Approach
 SAFETY
!!!!
 Human Computer Interface
 Usability
 Functionality

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Pulse
Temperature
Oxygen
Position
Specifications
Device Battery Life
Weight of the Device
Dimensions (Ankle Device)
Blood Oxygen Level Accuracy
Heart Rate Accurcy
Skin Temperature Accuracy
Position Accuracy
Wireless Transmission Range
> 12 hours
< .5 pounds
50 Width x 100 Length x 15 Height mm
+-20%
+-20%
+-20%
Back , Stomach, right side, Left Side
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
Coin Cell Battery
Heart Rate / Blood
Oxygenation Sensor
Circuit
CC2541 Microcontroller
Bluetooth BLE v4.0 RF
module circuit
DC-DC regulator
circuit
Body Position
Sensor Circuit
Skin Temperature
Sensor Circuit
BLE V4.0
compatible
display device
Central Processor
Low
Power
Small and Mobile
Interface capability with
multiple sensors
Interface capability with
wireless devices
CC2541
 Bluetooth
SoC solution
 SensorTag and Keyfob
development kits valuable for
reference design
 8051 MCU architecture
 Five-Channel Direct Memory
Access
 I2C, SPI interfaces
Peripherals
 Pulse
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Oximeter
Measures blood oxygen
saturation along with heart
rate
TI AFE4490
QFN package
3V-3.6V
 Temperature

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
Sensor
Measures the temperature
on Skin surface
TI TMP006
Wafer Level Chip Scale
2.4V-5.5V
Peripheral technical specs
Body
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Position Sensor
Invensense MPU6000
Gyro + Accelerometer
3 axis for each
Capable of SPI and I2C interface
QFN package
Communications
Bluetooth Low Energy
Input Voltage (volts)
RX current
TX current
Power Output
Receiver Sensitivity
Frequency
Data Rates
BER
Bluetooth Protocol
Special Features
Solder Package
Cost
Lead Time
CC2541
2 - 3.6
17.9mA
18.2mA @ 0 dB
0 dB
-94dBm at 1Mbps
2.4 GHz
250 kbps , 500 kbps,
1Mbps, 2Mbps
< 1%
BLE v4.0
CC2564-PAN1326
1.7 - 4.8
1mA
40mA
+10dB
-93dBm
2.4 GHz
250 kbps , 500 kbps,
1Mbps, 2Mbps
< 1%
BLE v4.0 and
Bluetooth classic
Microcontroller and RF Dual Mode, +10dB
module combined.
Xmit
40 pin QFN (visible)
24 pin
$6.62 (Digikey)
$20.72 (Digikey)
Ready to Ship
Ready to Ship
nRF51822
1.8 - 3.6
13mA
16mA
+4dB
-93dBm
2.4 GHz
250 kbps , 1Mbps,
2Mbps
< 1%
BLE v4.0
Microcontroller and RF
module combined.
48 pin QFN (visable)
$4.95 (Mouser)
Ready to Ship
POWER

Texas Instruments TPS62740
step down DC-DC converter
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2MHz switching
Selectable output voltage
range 1.8v-3.3v
Efficiency of 95%
Power Schematics
Power solution 2
 Linear
Tech LTC3534 Buck-Boost DC/DC
Converter
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2.4v-7v input range w/ 1.8-7v output
Use just 1 CR2032 battery
Buck-Boost Schematic
CC2541 Schematic
Sensor Schematics
Printed Circuit Board
Eagle
Cadsoft
www.4PCB.com
User Interface Design
 Ease


of use
Navigation
Menus
 Conducive
 Responsive
to the purpose of the device
Software Flow Charts
Software UML Chart
Ikea Instruction
Concept Design
Firmware Block Diagram
Sensors
Start
Setup and
Init Registers
Setup and
Init SPI/I2C
buses
Sample Data
Export to
Bluetooth
Build
 Soldering
QFN packages and crystal
oscillators w/ hot air pencil under 10x
microscope
 Solder remaining components with solder
iron.
Test
DC-DC
Regulators
CC2541
MPU-6000
TMP006
AFE4490
Mobile
Application
Work Division
Goolsby
Sensors
Lin
Ramirez
Tong
X
Bluetooth
X
CPU
X
Software
X
X
Mobile App
X
Board
Design
X
Power
X
X
X
Bill of Materials
Item:
Microprocessor CC2541
AFE4490
MPU6000
TMP006
TPS72430
PCB x2
Eagle Hobbyist Version
Sensor Tag
CC2541 Debugger
TI sponsor
Miscellaneous
Total so far…
Expected Total
Price (USD):
Free Sample
Free Sample
$10.72
Free Sample
Free Sample
$132
$170
$25
$99
$-175
$100
$412.72
$600.00
Project Schedule
Project Progress
Project Completion
Final Presentation
Hardware Testing
APP Development
Embedded coding
PCB Layout
Schematic Capture
Development
Research
0.00%
20.00%
40.00%
60.00%
80.00%
100.00%
Remaining Problems
 Everything
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Board Layout learning curve
RF PCB Layout precision
Understanding Bluetooth Stack protocols
Firmware loading and timings
Mobile application learning curve
AFE4490 analog frontend schematic
capture
Thanks
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
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Dr. Chan
Cadsoft Eagle staff
Texas Instruments
Dr. Richie
Ben’s parents
Chris’ wife
Xin Tong
Yowwu Lin
Christopher Ramirez
Ben Goolsby
Any Questions ????