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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
Design Decisions Low Power Wireless Ease of implementation Vendor Support Low Cost
Subsystems SensorsCommsPower 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 I 2 C, 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 specs Body Position Sensor Invensense MPU6000 Gyro + Accelerometer 3 axis for each Capable of SPI and I2C interface QFN package
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 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
Printed Circuit Board Eagle Cadsoft
User Interface Design Ease of use Navigation Menus Conducive to the purpose of the device Responsive
Software Flow Charts
Software UML Chart
Firmware Block Diagram Setup and Init Registers Setup and Init SPI/I 2 C buses Sample Data Export to Bluetooth Sensors Start
Build Soldering QFN packages and crystal oscillators w/ hot air pencil under 10x microscope Solder remaining components with solder iron.
Test DC-DC Regulators CC2541TMP006MPU-6000AFE4490 Mobile Application
Work Division GoolsbyLinRamirezTong SensorsX BluetoothX CPUX SoftwareXX Mobile AppX Board Design XX PowerXX
Bill of Materials Item: Price (USD): Microprocessor CC2541 Free Sample AFE4490 Free Sample MPU6000 $10.72 TMP006 Free Sample TPS72430Free Sample PCB x2 $132 Eagle Hobbyist Version $170 Sensor Tag$25 CC2541 Debugger$99 TI sponsor $-175 Miscellaneous$100 Total so far…$ Expected Total$600.00
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 ????
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