Team 4Baby Peas

“Pulse Early Alarm Sensor”

Chris Ramirez Benjamin GoolsbyXin TongYowwu 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 behind Product

SIDS Infant’s insignificant ability to maintain

homeostasis Unable to express precise problems

Motivation behind education and skill set RF design Software design Medical field

Design Approach SAFETY !!!! Human Computer Interface Usability Functionality

Pulse Temperature Oxygen Position

Specifications

Device Battery Life > 12 hoursWeight of the Device < .5 poundsDimensions (Ankle Device) 50 Width x 100 Length x 15 Height mmBlood Oxygen Level Accuracy +-20%Heart Rate Accurcy +-20%Skin Temperature Accuracy +-20%Position Accuracy Back , Stomach, right side, Left SideWireless Transmission Range 100 Feet

Design DecisionsLow PowerWirelessEase of implementationVendor SupportLow Cost

Subsystems

Sensors Comms Power

Central Processor

Mobile Application

Hardware Block Diagram

CC2541 Microcontroller Bluetooth BLE v4.0 RF

module circuit

BLE V4.0 compatible

display device

Heart Rate / Blood Oxygenation Sensor

Circuit

Body Position Sensor Circuit

Skin Temperature Sensor Circuit

Coin Cell BatteryDC-DC regulator

circuit

Central ProcessorLow PowerSmall and MobileInterface capability with

multiple sensorsInterface capability with

wireless devices

CC2541Bluetooth SoC solutionSensorTag and Keyfob

development kits valuable for reference design

8051 MCU architectureFive-Channel Direct Memory

Access I2C, SPI interfaces

Peripherals Pulse Oximeter

Measures blood oxygen saturation along with heart rate

TI AFE4490 QFN package 3V-3.6V

Temperature Sensor Measures the temperature

on Skin surface TI TMP006 Wafer Level Chip Scale 2.4V-5.5V

Peripheral technical specsBody Position Sensor

Invensense MPU6000 Gyro + Accelerometer 3 axis for each Capable of SPI and I2C interface QFN package

Communications

Bluetooth Low EnergyCC2541 CC2564-PAN1326 nRF51822

Input Voltage (volts) 2 - 3.6 1.7 - 4.8 1.8 - 3.6RX current 17.9mA 1mA 13mATX current 18.2mA @ 0 dB 40mA 16mAPower Output 0 dB +10dB +4dBReceiver Sensitivity -94dBm at 1Mbps -93dBm -93dBmFrequency 2.4 GHz 2.4 GHz 2.4 GHzData Rates 250 kbps , 500 kbps,

1Mbps, 2Mbps250 kbps , 500 kbps,

1Mbps, 2Mbps250 kbps , 1Mbps,

2MbpsBER < 1% < 1% < 1%

Bluetooth ProtocolBLE v4.0 BLE v4.0 and

Bluetooth classicBLE v4.0

Special Features Microcontroller and RF module combined.

Dual Mode, +10dB Xmit

Microcontroller and RF module combined.

Solder Package 40 pin QFN (visible) 24 pin 48 pin QFN (visable)Cost $6.62 (Digikey) $20.72 (Digikey) $4.95 (Mouser)Lead Time Ready to Ship Ready to Ship Ready to Ship

POWER Texas Instruments TPS62740

step down DC-DC converter

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

2.4v-7v input range w/ 1.8-7v output Use just 1 CR2032 battery

Buck-Boost Schematic

CC2541 Schematic

Sensor Schematics

Printed Circuit BoardEagle Cadsoftwww.4PCB.com

User Interface Design Ease of use

Navigation Menus

Conducive to the purpose of the device Responsive

Software Flow Charts

Software UML Chart

Ikea Instruction

Concept Design

Firmware Block Diagram

Setup and Init

Registers

Setup and Init SPI/I2C

busesSample Data

Export to Bluetooth

SensorsStart

Build Soldering QFN packages and crystal

oscillators w/ hot air pencil under 10x microscope

Solder remaining components with solder iron.

TestDC-DC

Regulators CC2541

TMP006MPU-6000

AFE4490 Mobile Application

Work DivisionGoolsby Lin Ramirez Tong

Sensors X

Bluetooth X

CPU X

Software X X

Mobile App X

Board Design

X X

Power X X

Bill of MaterialsItem: Price (USD):Microprocessor CC2541 Free SampleAFE4490 Free SampleMPU6000 $10.72TMP006 Free SampleTPS72430 Free SamplePCB x2 $132 Eagle Hobbyist Version $170Sensor Tag $25CC2541 Debugger $99TI sponsor $-175Miscellaneous $100Total so far… $412.72Expected Total $600.00

Project Schedule

Project Progress

Research

Development

Schematic Capture

PCB Layout

Embedded coding

APP Development

Hardware Testing

Final Presentation

Project Completion

0.00% 20.00% 40.00% 60.00% 80.00% 100.00%

Remaining Problems Everything

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 Dr. Chan Cadsoft Eagle staff Texas Instruments Dr. Richie Ben’s parents Chris’ wife Xin Tong Yowwu Lin Christopher Ramirez Ben Goolsby

Any Questions ????