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 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

Design Decisions Low Power Wireless Ease of implementation Vendor Support Low 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 Battery DC-DC regulator circuit

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 Oximeter Temperature Sensor 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 specs Body Position Sensor Invensense MPU6000 Gyro + Accelerometer 3 axis for each Capable of SPI and I2C interface QFN package

Communications

Bluetooth Low Energy

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 Board Eagle Cadsoft www.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 Sensors Start Sample Data Setup and Init Registers Setup and Init SPI/I2C buses 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 TMP006 MPU-6000 AFE4490 Mobile Application

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

Bill of Materials Item: Price (USD): Microprocessor CC2541 Free Sample AFE4490 Free Sample MPU6000 $10.72 TMP006 Free Sample TPS72430 Free Sample PCB x2 $132 Eagle Hobbyist Version $170 Sensor Tag $25 CC2541 Debugger $99 TI sponsor $-175 Miscellaneous $100 Total so far… $412.72 Expected Total $600.00

Project Schedule

Project Progress

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 ????