Optical Heart Optical Heart Monitor/Jump Drive Monitor/Jump Drive Sponsor: Calit2 Sponsor: Calit2 Mentor: Paul Blair Ph.D. Mentor: Paul Blair Ph.D. Team: Matt Chandrangsu, Jeffrey Chi, Team: Matt Chandrangsu, Jeffrey Chi, Kari Nip Kari Nip ECE 191 – Group 6 ECE 191 – Group 6 Fall 2008 Fall 2008
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Team: Matt Chandrangsu, Jeffrey Chi, Kari NipTeam: Matt Chandrangsu, Jeffrey Chi, Kari Nip
ECE 191 – Group 6ECE 191 – Group 6Fall 2008Fall 2008
AgendaAgenda
• Project Background and Objective
• Design Summary
• Approach and Methodology
• Results
• Conclusions
Background and ObjectiveBackground and Objective
• There is increasing interest within the medical community in studying an individual’s heart rate variability.
• Existing data collection systems are cumbersome and report heart rate rather than the variations of each heart beat.
• There are not many applications that allow users to save their heart rate data to view later for medical purposes.
• Our objective is to develop a small, reliable device capable of conveniently reporting a person's heart rate variability and storing the data for later use.
Design SummaryDesign Summary
Pulse Oximeter Sensor
Digital Signal Filtering
Flash Memory
AVR Microprocessor
AT90USB1287
Computer
Database
2 Stage Amplifier
Approach and MethodologyApproach and Methodology
• Research and familiarize with Atmel AVR Microcontrollers
• Understand heart rate monitor work from previous quarters
• Research FAT12 file systems• Write digital signal processing code that detects time
differences between heart beats from a raw signal• Write code that properly writes data to microcontroller
flash memory and verify data is read on PC• Write interrupt driven AVR Microcontroller code to
properly run application integrating all components
Pulse Oximeter SensorPulse Oximeter SensorPurpose: Indirectly measures the oxygen saturation of a patient's blood to find heart beat wave
Typically a 2 LED system:-One red LED (660nm)-One infrared LED (910nm).
We only use 1 LED:-Only care about finding peaks of heart beat signal, not oxygenation levels or accuracy of waveform
-Implemented using 1 SFH487 infrared LED transmitter and 1 SFH309 photodetector